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< a href = 'https://github.com/akkartik/mu/blob/main/412render-float-decimal.mu' > https://github.com/akkartik/mu/blob/main/412render-float-decimal.mu< / a >
< pre id = 'vimCodeElement' >
< span id = "L1" class = "LineNr" > 1 < / span > < span class = "muComment" > # print out floats in decimal< / span >
< span id = "L2" class = "LineNr" > 2 < / span > < span class = "muComment" > # < a href = "https://research.swtch.com/ftoa" > https://research.swtch.com/ftoa< / a > < / span >
< span id = "L3" class = "LineNr" > 3 < / span > < span class = "muComment" > #< / span >
< span id = "L4" class = "LineNr" > 4 < / span > < span class = "muComment" > # Basic idea:< / span >
< span id = "L5" class = "LineNr" > 5 < / span > < span class = "muComment" > # Ignoring sign, floating point numbers are represented as 1.mantissa * 2^exponent< / span >
< span id = "L6" class = "LineNr" > 6 < / span > < span class = "muComment" > # Therefore, to print a float in decimal, we need to:< / span >
< span id = "L7" class = "LineNr" > 7 < / span > < span class = "muComment" > # - compute its value without decimal point< / span >
< span id = "L8" class = "LineNr" > 8 < / span > < span class = "muComment" > # - convert to an array of decimal digits< / span >
< span id = "L9" class = "LineNr" > 9 < / span > < span class = "muComment" > # - print out the array while inserting the decimal point appropriately< / span >
< span id = "L10" class = "LineNr" > 10 < / span > < span class = "muComment" > #< / span >
< span id = "L11" class = "LineNr" > 11 < / span > < span class = "muComment" > # Basic complication: the computation generates numbers larger than an int can< / span >
< span id = "L12" class = "LineNr" > 12 < / span > < span class = "muComment" > # hold. We need a way to represent big ints.< / span >
< span id = "L13" class = "LineNr" > 13 < / span > < span class = "muComment" > #< / span >
< span id = "L14" class = "LineNr" > 14 < / span > < span class = "muComment" > # Key insight: use a representation for big ints that's close to what we need< / span >
< span id = "L15" class = "LineNr" > 15 < / span > < span class = "muComment" > # anyway, an array of decimal digits.< / span >
< span id = "L16" class = "LineNr" > 16 < / span > < span class = "muComment" > #< / span >
< span id = "L17" class = "LineNr" > 17 < / span > < span class = "muComment" > # Style note: we aren't creating a big int library here. The only operations< / span >
< span id = "L18" class = "LineNr" > 18 < / span > < span class = "muComment" > # we need are halving and doubling. Following the link above, it seems more< / span >
< span id = "L19" class = "LineNr" > 19 < / span > < span class = "muComment" > # comprehensible to keep these operations inlined so that we can track the< / span >
< span id = "L20" class = "LineNr" > 20 < / span > < span class = "muComment" > # position of the decimal point with dispatch.< / span >
< span id = "L21" class = "LineNr" > 21 < / span > < span class = "muComment" > #< / span >
< span id = "L22" class = "LineNr" > 22 < / span > < span class = "muComment" > # This approach turns out to be fast enough for most purposes.< / span >
< span id = "L23" class = "LineNr" > 23 < / span > < span class = "muComment" > # Optimizations, however, get wildly more complex.< / span >
< span id = "L24" class = "LineNr" > 24 < / span >
< span id = "L25" class = "LineNr" > 25 < / span > < span class = "PreProc" > fn< / span > < span class = "muTest" > < a href = '412render-float-decimal.mu.html#L25' > test-write-float-decimal-approximate-normal< / a > < / span > < span class = "Delimiter" > {< / span >
< span id = "L26" class = "LineNr" > 26 < / span > < span class = "PreProc" > var< / span > s-storage: (stream byte < span class = "Constant" > 0x10< / span > )
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< span id = "L27" class = "LineNr" > 27 < / span > < span class = "PreProc" > var< / span > s/< span class = "muRegEcx" > ecx< / span > : (addr stream byte) < span class = "Special" > < -< / span > address s-storage
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< span id = "L28" class = "LineNr" > 28 < / span > < span class = "muComment" > # 0.5< / span >
< span id = "L29" class = "LineNr" > 29 < / span > < span class = "PreProc" > var< / span > half/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > < a href = '408float.mu.html#L18' > rational< / a > < span class = "Constant" > 1< / span > , < span class = "Constant" > 2< / span >
< span id = "L30" class = "LineNr" > 30 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, half, < span class = "Constant" > 3< / span >
< span id = "L31" class = "LineNr" > 31 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 0.5" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L25' > test-write-float-decimal-approximate-normal< / a > 0.5" < / span >
< span id = "L32" class = "LineNr" > 32 < / span > < span class = "muComment" > # 0.25< / span >
< span id = "L33" class = "LineNr" > 33 < / span > < a href = '106stream.subx.html#L20' > clear-stream< / a > s
< span id = "L34" class = "LineNr" > 34 < / span > < span class = "PreProc" > var< / span > quarter/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > < a href = '408float.mu.html#L18' > rational< / a > < span class = "Constant" > 1< / span > , < span class = "Constant" > 4< / span >
< span id = "L35" class = "LineNr" > 35 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, quarter, < span class = "Constant" > 3< / span >
< span id = "L36" class = "LineNr" > 36 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 0.25" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L25' > test-write-float-decimal-approximate-normal< / a > 0.25" < / span >
< span id = "L37" class = "LineNr" > 37 < / span > < span class = "muComment" > # 0.75< / span >
< span id = "L38" class = "LineNr" > 38 < / span > < a href = '106stream.subx.html#L20' > clear-stream< / a > s
< span id = "L39" class = "LineNr" > 39 < / span > < span class = "PreProc" > var< / span > three-quarters/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > < a href = '408float.mu.html#L18' > rational< / a > < span class = "Constant" > 3< / span > , < span class = "Constant" > 4< / span >
< span id = "L40" class = "LineNr" > 40 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, three-quarters, < span class = "Constant" > 3< / span >
< span id = "L41" class = "LineNr" > 41 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 0.75" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L25' > test-write-float-decimal-approximate-normal< / a > 0.75" < / span >
< span id = "L42" class = "LineNr" > 42 < / span > < span class = "muComment" > # 0.125< / span >
< span id = "L43" class = "LineNr" > 43 < / span > < a href = '106stream.subx.html#L20' > clear-stream< / a > s
< span id = "L44" class = "LineNr" > 44 < / span > < span class = "PreProc" > var< / span > eighth/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > < a href = '408float.mu.html#L18' > rational< / a > < span class = "Constant" > 1< / span > , < span class = "Constant" > 8< / span >
< span id = "L45" class = "LineNr" > 45 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, eighth, < span class = "Constant" > 3< / span >
< span id = "L46" class = "LineNr" > 46 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 0.125" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L25' > test-write-float-decimal-approximate-normal< / a > 0.125" < / span >
< span id = "L47" class = "LineNr" > 47 < / span > < span class = "muComment" > # 0.0625; start using scientific notation< / span >
< span id = "L48" class = "LineNr" > 48 < / span > < a href = '106stream.subx.html#L20' > clear-stream< / a > s
< span id = "L49" class = "LineNr" > 49 < / span > < span class = "PreProc" > var< / span > sixteenth/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > < a href = '408float.mu.html#L18' > rational< / a > < span class = "Constant" > 1< / span > , < span class = "Constant" > 0x10< / span >
< span id = "L50" class = "LineNr" > 50 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, sixteenth, < span class = "Constant" > 3< / span >
< span id = "L51" class = "LineNr" > 51 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 6.25e-2" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L25' > test-write-float-decimal-approximate-normal< / a > 0.0625" < / span >
< span id = "L52" class = "LineNr" > 52 < / span > < span class = "muComment" > # sqrt(2); truncate floats with lots of digits after the decimal but not too many before< / span >
< span id = "L53" class = "LineNr" > 53 < / span > < a href = '106stream.subx.html#L20' > clear-stream< / a > s
< span id = "L54" class = "LineNr" > 54 < / span > < span class = "PreProc" > var< / span > two-f/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > < a href = '408float.mu.html#L18' > rational< / a > < span class = "Constant" > 2< / span > , < span class = "Constant" > 1< / span >
< span id = "L55" class = "LineNr" > 55 < / span > < span class = "PreProc" > var< / span > sqrt-2/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > square-root two-f
< span id = "L56" class = "LineNr" > 56 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, sqrt-2, < span class = "Constant" > 3< / span >
< span id = "L57" class = "LineNr" > 57 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 1.414" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L25' > test-write-float-decimal-approximate-normal< / a > √2" < / span >
< span id = "L58" class = "LineNr" > 58 < / span > < span class = "Delimiter" > }< / span >
< span id = "L59" class = "LineNr" > 59 < / span >
< span id = "L60" class = "LineNr" > 60 < / span > < span class = "muComment" > # print whole integers without decimals< / span >
< span id = "L61" class = "LineNr" > 61 < / span > < span class = "PreProc" > fn< / span > < span class = "muTest" > < a href = '412render-float-decimal.mu.html#L61' > test-write-float-decimal-approximate-integer< / a > < / span > < span class = "Delimiter" > {< / span >
< span id = "L62" class = "LineNr" > 62 < / span > < span class = "PreProc" > var< / span > s-storage: (stream byte < span class = "Constant" > 0x10< / span > )
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< span id = "L63" class = "LineNr" > 63 < / span > < span class = "PreProc" > var< / span > s/< span class = "muRegEcx" > ecx< / span > : (addr stream byte) < span class = "Special" > < -< / span > address s-storage
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< span id = "L64" class = "LineNr" > 64 < / span > < span class = "muComment" > # 1< / span >
< span id = "L65" class = "LineNr" > 65 < / span > < span class = "PreProc" > var< / span > one-f/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > < a href = '408float.mu.html#L18' > rational< / a > < span class = "Constant" > 1< / span > , < span class = "Constant" > 1< / span >
< span id = "L66" class = "LineNr" > 66 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, one-f, < span class = "Constant" > 3< / span >
< span id = "L67" class = "LineNr" > 67 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 1" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L61' > test-write-float-decimal-approximate-integer< / a > 1" < / span >
< span id = "L68" class = "LineNr" > 68 < / span > < span class = "muComment" > # 2< / span >
< span id = "L69" class = "LineNr" > 69 < / span > < a href = '106stream.subx.html#L20' > clear-stream< / a > s
< span id = "L70" class = "LineNr" > 70 < / span > < span class = "PreProc" > var< / span > two-f/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > < a href = '408float.mu.html#L18' > rational< / a > < span class = "Constant" > 2< / span > , < span class = "Constant" > 1< / span >
< span id = "L71" class = "LineNr" > 71 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, two-f, < span class = "Constant" > 3< / span >
< span id = "L72" class = "LineNr" > 72 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 2" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L61' > test-write-float-decimal-approximate-integer< / a > 2" < / span >
< span id = "L73" class = "LineNr" > 73 < / span > < span class = "muComment" > # 10< / span >
< span id = "L74" class = "LineNr" > 74 < / span > < a href = '106stream.subx.html#L20' > clear-stream< / a > s
< span id = "L75" class = "LineNr" > 75 < / span > < span class = "PreProc" > var< / span > ten-f/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > < a href = '408float.mu.html#L18' > rational< / a > < span class = "Constant" > 0xa< / span > , < span class = "Constant" > 1< / span >
< span id = "L76" class = "LineNr" > 76 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, ten-f, < span class = "Constant" > 3< / span >
< span id = "L77" class = "LineNr" > 77 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 10" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L61' > test-write-float-decimal-approximate-integer< / a > 10" < / span >
< span id = "L78" class = "LineNr" > 78 < / span > < span class = "muComment" > # -10< / span >
< span id = "L79" class = "LineNr" > 79 < / span > < a href = '106stream.subx.html#L20' > clear-stream< / a > s
< span id = "L80" class = "LineNr" > 80 < / span > < span class = "PreProc" > var< / span > minus-ten-f/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > < a href = '408float.mu.html#L18' > rational< / a > < span class = "Constant" > -0xa< / span > , < span class = "Constant" > 1< / span >
< span id = "L81" class = "LineNr" > 81 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, minus-ten-f, < span class = "Constant" > 3< / span >
< span id = "L82" class = "LineNr" > 82 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " -10" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L61' > test-write-float-decimal-approximate-integer< / a > -10" < / span >
< span id = "L83" class = "LineNr" > 83 < / span > < span class = "muComment" > # 999< / span >
< span id = "L84" class = "LineNr" > 84 < / span > < a href = '106stream.subx.html#L20' > clear-stream< / a > s
< span id = "L85" class = "LineNr" > 85 < / span > < span class = "PreProc" > var< / span > minus-ten-f/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > < a href = '408float.mu.html#L18' > rational< / a > < span class = "Constant" > 0x3e7< / span > , < span class = "Constant" > 1< / span >
< span id = "L86" class = "LineNr" > 86 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, minus-ten-f, < span class = "Constant" > 3< / span >
< span id = "L87" class = "LineNr" > 87 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 999" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L61' > test-write-float-decimal-approximate-integer< / a > 1000" < / span >
< span id = "L88" class = "LineNr" > 88 < / span > < span class = "muComment" > # 1000 - start using scientific notation< / span >
< span id = "L89" class = "LineNr" > 89 < / span > < a href = '106stream.subx.html#L20' > clear-stream< / a > s
< span id = "L90" class = "LineNr" > 90 < / span > < span class = "PreProc" > var< / span > minus-ten-f/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > < a href = '408float.mu.html#L18' > rational< / a > < span class = "Constant" > 0x3e8< / span > , < span class = "Constant" > 1< / span >
< span id = "L91" class = "LineNr" > 91 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, minus-ten-f, < span class = "Constant" > 3< / span >
< span id = "L92" class = "LineNr" > 92 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 1.00e3" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L61' > test-write-float-decimal-approximate-integer< / a > 1000" < / span >
< span id = "L93" class = "LineNr" > 93 < / span > < span class = "muComment" > # 100,000< / span >
< span id = "L94" class = "LineNr" > 94 < / span > < a href = '106stream.subx.html#L20' > clear-stream< / a > s
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< span id = "L95" class = "LineNr" > 95 < / span > < span class = "PreProc" > var< / span > hundred-thousand/eax: int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0x186a0< / span >
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< span id = "L96" class = "LineNr" > 96 < / span > < span class = "PreProc" > var< / span > hundred-thousand-f/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > convert hundred-thousand
< span id = "L97" class = "LineNr" > 97 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, hundred-thousand-f, < span class = "Constant" > 3< / span >
< span id = "L98" class = "LineNr" > 98 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 1.00e5" < / span > , < span class = "Constant" > " F - < a href = '412render-float-decimal.mu.html#L61' > test-write-float-decimal-approximate-integer< / a > 100,000" < / span >
< span id = "L99" class = "LineNr" > 99 < / span > < span class = "Delimiter" > }< / span >
< span id = "L100" class = "LineNr" > 100 < / span >
< span id = "L101" class = "LineNr" > 101 < / span > < span class = "PreProc" > fn< / span > < span class = "muTest" > < a href = '412render-float-decimal.mu.html#L101' > test-write-float-decimal-approximate-zero< / a > < / span > < span class = "Delimiter" > {< / span >
< span id = "L102" class = "LineNr" > 102 < / span > < span class = "PreProc" > var< / span > s-storage: (stream byte < span class = "Constant" > 0x10< / span > )
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< span id = "L103" class = "LineNr" > 103 < / span > < span class = "PreProc" > var< / span > s/< span class = "muRegEcx" > ecx< / span > : (addr stream byte) < span class = "Special" > < -< / span > address s-storage
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< span id = "L104" class = "LineNr" > 104 < / span > < span class = "PreProc" > var< / span > zero: float
< span id = "L105" class = "LineNr" > 105 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, zero, < span class = "Constant" > 3< / span >
< span id = "L106" class = "LineNr" > 106 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " 0" < / span > , < span class = "Constant" > " F - test-write-float-decimal-approximate-zero" < / span >
< span id = "L107" class = "LineNr" > 107 < / span > < span class = "Delimiter" > }< / span >
< span id = "L108" class = "LineNr" > 108 < / span >
< span id = "L109" class = "LineNr" > 109 < / span > < span class = "PreProc" > fn< / span > < span class = "muTest" > < a href = '412render-float-decimal.mu.html#L109' > test-write-float-decimal-approximate-negative-zero< / a > < / span > < span class = "Delimiter" > {< / span >
< span id = "L110" class = "LineNr" > 110 < / span > < span class = "PreProc" > var< / span > s-storage: (stream byte < span class = "Constant" > 0x10< / span > )
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< span id = "L111" class = "LineNr" > 111 < / span > < span class = "PreProc" > var< / span > s/< span class = "muRegEcx" > ecx< / span > : (addr stream byte) < span class = "Special" > < -< / span > address s-storage
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< span id = "L112" class = "LineNr" > 112 < / span > < span class = "PreProc" > var< / span > n: int
< span id = "L113" class = "LineNr" > 113 < / span > copy-to n, < span class = "Constant" > 0x80000000< / span >
< span id = "L114" class = "LineNr" > 114 < / span > < span class = "PreProc" > var< / span > negative-zero/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > reinterpret n
< span id = "L115" class = "LineNr" > 115 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, negative-zero, < span class = "Constant" > 3< / span >
< span id = "L116" class = "LineNr" > 116 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " -0" < / span > , < span class = "Constant" > " F - test-write-float-decimal-approximate-negative-zero" < / span >
< span id = "L117" class = "LineNr" > 117 < / span > < span class = "Delimiter" > }< / span >
< span id = "L118" class = "LineNr" > 118 < / span >
< span id = "L119" class = "LineNr" > 119 < / span > < span class = "PreProc" > fn< / span > < span class = "muTest" > < a href = '412render-float-decimal.mu.html#L119' > test-write-float-decimal-approximate-infinity< / a > < / span > < span class = "Delimiter" > {< / span >
< span id = "L120" class = "LineNr" > 120 < / span > < span class = "PreProc" > var< / span > s-storage: (stream byte < span class = "Constant" > 0x10< / span > )
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< span id = "L121" class = "LineNr" > 121 < / span > < span class = "PreProc" > var< / span > s/< span class = "muRegEcx" > ecx< / span > : (addr stream byte) < span class = "Special" > < -< / span > address s-storage
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< span id = "L122" class = "LineNr" > 122 < / span > < span class = "PreProc" > var< / span > n: int
< span id = "L123" class = "LineNr" > 123 < / span > < span class = "muComment" > # 0|11111111|00000000000000000000000< / span >
< span id = "L124" class = "LineNr" > 124 < / span > < span class = "muComment" > # 0111|1111|1000|0000|0000|0000|0000|0000< / span >
< span id = "L125" class = "LineNr" > 125 < / span > copy-to n, < span class = "Constant" > 0x7f800000< / span >
< span id = "L126" class = "LineNr" > 126 < / span > < span class = "PreProc" > var< / span > infinity/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > reinterpret n
< span id = "L127" class = "LineNr" > 127 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, infinity, < span class = "Constant" > 3< / span >
< span id = "L128" class = "LineNr" > 128 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " Inf" < / span > , < span class = "Constant" > " F - test-write-float-decimal-approximate-infinity" < / span >
< span id = "L129" class = "LineNr" > 129 < / span > < span class = "Delimiter" > }< / span >
< span id = "L130" class = "LineNr" > 130 < / span >
< span id = "L131" class = "LineNr" > 131 < / span > < span class = "PreProc" > fn< / span > < span class = "muTest" > < a href = '412render-float-decimal.mu.html#L131' > test-write-float-decimal-approximate-negative-infinity< / a > < / span > < span class = "Delimiter" > {< / span >
< span id = "L132" class = "LineNr" > 132 < / span > < span class = "PreProc" > var< / span > s-storage: (stream byte < span class = "Constant" > 0x10< / span > )
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< span id = "L133" class = "LineNr" > 133 < / span > < span class = "PreProc" > var< / span > s/< span class = "muRegEcx" > ecx< / span > : (addr stream byte) < span class = "Special" > < -< / span > address s-storage
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< span id = "L134" class = "LineNr" > 134 < / span > < span class = "PreProc" > var< / span > n: int
< span id = "L135" class = "LineNr" > 135 < / span > copy-to n, < span class = "Constant" > 0xff800000< / span >
< span id = "L136" class = "LineNr" > 136 < / span > < span class = "PreProc" > var< / span > negative-infinity/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > reinterpret n
< span id = "L137" class = "LineNr" > 137 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, negative-infinity, < span class = "Constant" > 3< / span >
< span id = "L138" class = "LineNr" > 138 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " -Inf" < / span > , < span class = "Constant" > " F - test-write-float-decimal-approximate-negative-infinity" < / span >
< span id = "L139" class = "LineNr" > 139 < / span > < span class = "Delimiter" > }< / span >
< span id = "L140" class = "LineNr" > 140 < / span >
< span id = "L141" class = "LineNr" > 141 < / span > < span class = "PreProc" > fn< / span > < span class = "muTest" > < a href = '412render-float-decimal.mu.html#L141' > test-write-float-decimal-approximate-not-a-number< / a > < / span > < span class = "Delimiter" > {< / span >
< span id = "L142" class = "LineNr" > 142 < / span > < span class = "PreProc" > var< / span > s-storage: (stream byte < span class = "Constant" > 0x10< / span > )
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< span id = "L143" class = "LineNr" > 143 < / span > < span class = "PreProc" > var< / span > s/< span class = "muRegEcx" > ecx< / span > : (addr stream byte) < span class = "Special" > < -< / span > address s-storage
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< span id = "L144" class = "LineNr" > 144 < / span > < span class = "PreProc" > var< / span > n: int
< span id = "L145" class = "LineNr" > 145 < / span > copy-to n, < span class = "Constant" > 0xffffffff< / span > < span class = "muComment" > # exponent must be all 1's, and mantissa must be non-zero< / span >
< span id = "L146" class = "LineNr" > 146 < / span > < span class = "PreProc" > var< / span > nan/< span class = "Constant" > xmm0< / span > : float < span class = "Special" > < -< / span > reinterpret n
< span id = "L147" class = "LineNr" > 147 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, nan, < span class = "Constant" > 3< / span >
< span id = "L148" class = "LineNr" > 148 < / span > < a href = '109stream-equal.subx.html#L194' > check-stream-equal< / a > s, < span class = "Constant" > " NaN" < / span > , < span class = "Constant" > " F - test-write-float-decimal-approximate-not-a-number" < / span >
< span id = "L149" class = "LineNr" > 149 < / span > < span class = "Delimiter" > }< / span >
< span id = "L150" class = "LineNr" > 150 < / span >
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< span id = "L151" class = "LineNr" > 151 < / span > < span class = "PreProc" > fn< / span > < span class = "muFunction" > < a href = '412render-float-decimal.mu.html#L151' > render-float-decimal< / a > < / span > < a href = '500fake-screen.mu.html#L16' > screen< / a > : (addr < a href = '500fake-screen.mu.html#L16' > screen< / a > ), in: float, precision: int, x: int, y: int, color: int, background-color: int< span class = "PreProc" > -> < / span > _/eax: int < span class = "Delimiter" > {< / span >
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< span id = "L152" class = "LineNr" > 152 < / span > < span class = "PreProc" > var< / span > s-storage: (stream byte < span class = "Constant" > 0x10< / span > )
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< span id = "L153" class = "LineNr" > 153 < / span > < span class = "PreProc" > var< / span > s/< span class = "muRegEsi" > esi< / span > : (addr stream byte) < span class = "Special" > < -< / span > address s-storage
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< span id = "L154" class = "LineNr" > 154 < / span > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > s, in, precision
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< span id = "L155" class = "LineNr" > 155 < / span > < span class = "PreProc" > var< / span > width/eax: int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
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< span id = "L156" class = "LineNr" > 156 < / span > < span class = "PreProc" > var< / span > height/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-10-12 04:35:16 +00:00
< span id = "L157" class = "LineNr" > 157 < / span > width, height < span class = "Special" > < -< / span > < a href = '500fake-screen.mu.html#L75' > screen-size< / a > < a href = '500fake-screen.mu.html#L16' > screen< / a >
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< span id = "L158" class = "LineNr" > 158 < / span > < span class = "PreProc" > var< / span > result/eax: int < span class = "Special" > < -< / span > < a href = '501draw-text.mu.html#L117' > draw-stream-rightward< / a > < a href = '500fake-screen.mu.html#L16' > screen< / a > , s, x, width, y, color, background-color
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< span id = "L159" class = "LineNr" > 159 < / span > < span class = "PreProc" > return< / span > result
< span id = "L160" class = "LineNr" > 160 < / span > < span class = "Delimiter" > }< / span >
< span id = "L161" class = "LineNr" > 161 < / span >
< span id = "L162" class = "LineNr" > 162 < / span > < span class = "muComment" > # 'precision' controls the maximum width past which we resort to scientific notation< / span >
< span id = "L163" class = "LineNr" > 163 < / span > < span class = "PreProc" > fn< / span > < span class = "muFunction" > < a href = '412render-float-decimal.mu.html#L163' > write-float-decimal-approximate< / a > < / span > out: (addr stream byte), in: float, precision: int < span class = "Delimiter" > {< / span >
< span id = "L164" class = "LineNr" > 164 < / span > < span class = "muComment" > # - special names< / span >
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< span id = "L165" class = "LineNr" > 165 < / span > < span class = "PreProc" > var< / span > bits/eax: int < span class = "Special" > < -< / span > reinterpret in
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< span id = "L166" class = "LineNr" > 166 < / span > compare bits, < span class = "Constant" > 0< / span >
< span id = "L167" class = "LineNr" > 167 < / span > < span class = "Delimiter" > {< / span >
< span id = "L168" class = "LineNr" > 168 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L169" class = "LineNr" > 169 < / span > < a href = '108write.subx.html#L11' > write< / a > out, < span class = "Constant" > " 0" < / span >
< span id = "L170" class = "LineNr" > 170 < / span > < span class = "PreProc" > return< / span >
< span id = "L171" class = "LineNr" > 171 < / span > < span class = "Delimiter" > }< / span >
< span id = "L172" class = "LineNr" > 172 < / span > compare bits, < span class = "Constant" > 0x80000000< / span >
< span id = "L173" class = "LineNr" > 173 < / span > < span class = "Delimiter" > {< / span >
< span id = "L174" class = "LineNr" > 174 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L175" class = "LineNr" > 175 < / span > < a href = '108write.subx.html#L11' > write< / a > out, < span class = "Constant" > " -0" < / span >
< span id = "L176" class = "LineNr" > 176 < / span > < span class = "PreProc" > return< / span >
< span id = "L177" class = "LineNr" > 177 < / span > < span class = "Delimiter" > }< / span >
< span id = "L178" class = "LineNr" > 178 < / span > compare bits, < span class = "Constant" > 0x7f800000< / span >
< span id = "L179" class = "LineNr" > 179 < / span > < span class = "Delimiter" > {< / span >
< span id = "L180" class = "LineNr" > 180 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L181" class = "LineNr" > 181 < / span > < a href = '108write.subx.html#L11' > write< / a > out, < span class = "Constant" > " Inf" < / span >
< span id = "L182" class = "LineNr" > 182 < / span > < span class = "PreProc" > return< / span >
< span id = "L183" class = "LineNr" > 183 < / span > < span class = "Delimiter" > }< / span >
< span id = "L184" class = "LineNr" > 184 < / span > compare bits, < span class = "Constant" > 0xff800000< / span >
< span id = "L185" class = "LineNr" > 185 < / span > < span class = "Delimiter" > {< / span >
< span id = "L186" class = "LineNr" > 186 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L187" class = "LineNr" > 187 < / span > < a href = '108write.subx.html#L11' > write< / a > out, < span class = "Constant" > " -Inf" < / span >
< span id = "L188" class = "LineNr" > 188 < / span > < span class = "PreProc" > return< / span >
< span id = "L189" class = "LineNr" > 189 < / span > < span class = "Delimiter" > }< / span >
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< span id = "L190" class = "LineNr" > 190 < / span > < span class = "PreProc" > var< / span > exponent/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy bits
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< span id = "L191" class = "LineNr" > 191 < / span > exponent < span class = "Special" > < -< / span > shift-right < span class = "Constant" > 0x17< / span > < span class = "muComment" > # 23 bits of mantissa< / span >
< span id = "L192" class = "LineNr" > 192 < / span > exponent < span class = "Special" > < -< / span > and < span class = "Constant" > 0xff< / span >
< span id = "L193" class = "LineNr" > 193 < / span > exponent < span class = "Special" > < -< / span > subtract < span class = "Constant" > 0x7f< / span >
< span id = "L194" class = "LineNr" > 194 < / span > compare exponent, < span class = "Constant" > 0x80< / span >
< span id = "L195" class = "LineNr" > 195 < / span > < span class = "Delimiter" > {< / span >
< span id = "L196" class = "LineNr" > 196 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L197" class = "LineNr" > 197 < / span > < a href = '108write.subx.html#L11' > write< / a > out, < span class = "Constant" > " NaN" < / span >
< span id = "L198" class = "LineNr" > 198 < / span > < span class = "PreProc" > return< / span >
< span id = "L199" class = "LineNr" > 199 < / span > < span class = "Delimiter" > }< / span >
< span id = "L200" class = "LineNr" > 200 < / span > < span class = "muComment" > # - regular numbers< / span >
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< span id = "L201" class = "LineNr" > 201 < / span > < span class = "PreProc" > var< / span > sign/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy bits
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< span id = "L202" class = "LineNr" > 202 < / span > sign < span class = "Special" > < -< / span > shift-right < span class = "Constant" > 0x1f< / span >
< span id = "L203" class = "LineNr" > 203 < / span > < span class = "Delimiter" > {< / span >
< span id = "L204" class = "LineNr" > 204 < / span > compare sign, < span class = "Constant" > 1< / span >
< span id = "L205" class = "LineNr" > 205 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L206" class = "LineNr" > 206 < / span > < a href = '115write-byte.subx.html#L12' > append-byte< / a > out, < span class = "Constant" > 0x2d< / span > /minus
< span id = "L207" class = "LineNr" > 207 < / span > < span class = "Delimiter" > }< / span >
< span id = "L208" class = "LineNr" > 208 < / span >
< span id = "L209" class = "LineNr" > 209 < / span > < span class = "muComment" > # v = 1.mantissa (in base 2) < < 0x17< / span >
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< span id = "L210" class = "LineNr" > 210 < / span > < span class = "PreProc" > var< / span > v/< span class = "muRegEbx" > ebx< / span > : int < span class = "Special" > < -< / span > copy bits
2021-03-24 00:31:08 +00:00
< span id = "L211" class = "LineNr" > 211 < / span > v < span class = "Special" > < -< / span > and < span class = "Constant" > 0x7fffff< / span >
< span id = "L212" class = "LineNr" > 212 < / span > v < span class = "Special" > < -< / span > or < span class = "Constant" > 0x00800000< / span > < span class = "muComment" > # insert implicit 1< / span >
< span id = "L213" class = "LineNr" > 213 < / span > < span class = "muComment" > # e = exponent - 0x17< / span >
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< span id = "L214" class = "LineNr" > 214 < / span > < span class = "PreProc" > var< / span > e/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy exponent
2021-03-24 00:31:08 +00:00
< span id = "L215" class = "LineNr" > 215 < / span > e < span class = "Special" > < -< / span > subtract < span class = "Constant" > 0x17< / span > < span class = "muComment" > # move decimal place from before mantissa to after< / span >
< span id = "L216" class = "LineNr" > 216 < / span >
< span id = "L217" class = "LineNr" > 217 < / span > < span class = "muComment" > # initialize buffer with decimal representation of v< / span >
< span id = "L218" class = "LineNr" > 218 < / span > < span class = "muComment" > # unlike < a href = "https://research.swtch.com/ftoa" > https://research.swtch.com/ftoa< / a > , no ascii here< / span >
< span id = "L219" class = "LineNr" > 219 < / span > < span class = "PreProc" > var< / span > buf-storage: (array byte < span class = "Constant" > 0x7f< / span > )
2021-06-16 04:50:13 +00:00
< span id = "L220" class = "LineNr" > 220 < / span > < span class = "PreProc" > var< / span > buf/< span class = "muRegEdi" > edi< / span > : (addr array byte) < span class = "Special" > < -< / span > address buf-storage
2021-06-27 03:55:36 +00:00
< span id = "L221" class = "LineNr" > 221 < / span > < span class = "PreProc" > var< / span > n/eax: int < span class = "Special" > < -< / span > < a href = '412render-float-decimal.mu.html#L251' > decimal-digits< / a > v, buf
2021-03-24 00:31:08 +00:00
< span id = "L222" class = "LineNr" > 222 < / span > < span class = "muComment" > # I suspect we can do without reversing, but we'll follow < a href = "https://research.swtch.com/ftoa" > https://research.swtch.com/ftoa< / a > < / span >
< span id = "L223" class = "LineNr" > 223 < / span > < span class = "muComment" > # closely for now.< / span >
< span id = "L224" class = "LineNr" > 224 < / span > < a href = '412render-float-decimal.mu.html#L268' > reverse-digits< / a > buf, n
< span id = "L225" class = "LineNr" > 225 < / span >
< span id = "L226" class = "LineNr" > 226 < / span > < span class = "muComment" > # loop if e > 0< / span >
< span id = "L227" class = "LineNr" > 227 < / span > < span class = "Delimiter" > {< / span >
< span id = "L228" class = "LineNr" > 228 < / span > compare e, < span class = "Constant" > 0< / span >
< span id = "L229" class = "LineNr" > 229 < / span > < span class = "PreProc" > break-if-< =< / span >
< span id = "L230" class = "LineNr" > 230 < / span > n < span class = "Special" > < -< / span > < a href = '412render-float-decimal.mu.html#L290' > double-array-of-decimal-digits< / a > buf, n
< span id = "L231" class = "LineNr" > 231 < / span > e < span class = "Special" > < -< / span > decrement
< span id = "L232" class = "LineNr" > 232 < / span > < span class = "PreProc" > loop< / span >
< span id = "L233" class = "LineNr" > 233 < / span > < span class = "Delimiter" > }< / span >
< span id = "L234" class = "LineNr" > 234 < / span >
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< span id = "L235" class = "LineNr" > 235 < / span > < span class = "PreProc" > var< / span > dp/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy n
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< span id = "L236" class = "LineNr" > 236 < / span >
< span id = "L237" class = "LineNr" > 237 < / span > < span class = "muComment" > # loop if e < 0< / span >
< span id = "L238" class = "LineNr" > 238 < / span > < span class = "Delimiter" > {< / span >
< span id = "L239" class = "LineNr" > 239 < / span > compare e, < span class = "Constant" > 0< / span >
< span id = "L240" class = "LineNr" > 240 < / span > < span class = "PreProc" > break-if-> =< / span >
< span id = "L241" class = "LineNr" > 241 < / span > n, dp < span class = "Special" > < -< / span > < a href = '412render-float-decimal.mu.html#L341' > halve-array-of-decimal-digits< / a > buf, n, dp
< span id = "L242" class = "LineNr" > 242 < / span > e < span class = "Special" > < -< / span > increment
< span id = "L243" class = "LineNr" > 243 < / span > < span class = "PreProc" > loop< / span >
< span id = "L244" class = "LineNr" > 244 < / span > < span class = "Delimiter" > }< / span >
< span id = "L245" class = "LineNr" > 245 < / span >
< span id = "L246" class = "LineNr" > 246 < / span > < a href = '412render-float-decimal.mu.html#L415' > _write-float-array-of-decimal-digits< / a > out, buf, n, dp, precision
< span id = "L247" class = "LineNr" > 247 < / span > < span class = "Delimiter" > }< / span >
< span id = "L248" class = "LineNr" > 248 < / span >
< span id = "L249" class = "LineNr" > 249 < / span > < span class = "muComment" > # store the decimal digits of 'n' into 'buf', units first< / span >
< span id = "L250" class = "LineNr" > 250 < / span > < span class = "muComment" > # n must be positive< / span >
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< span id = "L251" class = "LineNr" > 251 < / span > < span class = "PreProc" > fn< / span > < span class = "muFunction" > < a href = '412render-float-decimal.mu.html#L251' > decimal-digits< / a > < / span > n: int, _buf: (addr array byte)< span class = "PreProc" > -> < / span > _/eax: int < span class = "Delimiter" > {< / span >
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< span id = "L252" class = "LineNr" > 252 < / span > < span class = "PreProc" > var< / span > buf/< span class = "muRegEdi" > edi< / span > : (addr array byte) < span class = "Special" > < -< / span > copy _buf
< span id = "L253" class = "LineNr" > 253 < / span > < span class = "PreProc" > var< / span > i/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
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< span id = "L254" class = "LineNr" > 254 < / span > < span class = "PreProc" > var< / span > curr/eax: int < span class = "Special" > < -< / span > copy n
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< span id = "L255" class = "LineNr" > 255 < / span > < span class = "PreProc" > var< / span > curr-byte/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
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< span id = "L256" class = "LineNr" > 256 < / span > < span class = "Delimiter" > {< / span >
< span id = "L257" class = "LineNr" > 257 < / span > compare curr, < span class = "Constant" > 0< / span >
< span id = "L258" class = "LineNr" > 258 < / span > < span class = "PreProc" > break-if-=< / span >
< span id = "L259" class = "LineNr" > 259 < / span > curr, curr-byte < span class = "Special" > < -< / span > < a href = '314divide.subx.html#L3' > integer-divide< / a > curr, < span class = "Constant" > 0xa< / span >
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< span id = "L260" class = "LineNr" > 260 < / span > < span class = "PreProc" > var< / span > dest/< span class = "muRegEbx" > ebx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, i
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< span id = "L261" class = "LineNr" > 261 < / span > copy-byte-to *dest, curr-byte
< span id = "L262" class = "LineNr" > 262 < / span > i < span class = "Special" > < -< / span > increment
< span id = "L263" class = "LineNr" > 263 < / span > < span class = "PreProc" > loop< / span >
< span id = "L264" class = "LineNr" > 264 < / span > < span class = "Delimiter" > }< / span >
< span id = "L265" class = "LineNr" > 265 < / span > < span class = "PreProc" > return< / span > i
< span id = "L266" class = "LineNr" > 266 < / span > < span class = "Delimiter" > }< / span >
< span id = "L267" class = "LineNr" > 267 < / span >
< span id = "L268" class = "LineNr" > 268 < / span > < span class = "PreProc" > fn< / span > < span class = "muFunction" > < a href = '412render-float-decimal.mu.html#L268' > reverse-digits< / a > < / span > _buf: (addr array byte), n: int < span class = "Delimiter" > {< / span >
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< span id = "L269" class = "LineNr" > 269 < / span > < span class = "PreProc" > var< / span > buf/< span class = "muRegEsi" > esi< / span > : (addr array byte) < span class = "Special" > < -< / span > copy _buf
< span id = "L270" class = "LineNr" > 270 < / span > < span class = "PreProc" > var< / span > left/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
< span id = "L271" class = "LineNr" > 271 < / span > < span class = "PreProc" > var< / span > right/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy n
2021-03-24 00:31:08 +00:00
< span id = "L272" class = "LineNr" > 272 < / span > right < span class = "Special" > < -< / span > decrement
< span id = "L273" class = "LineNr" > 273 < / span > < span class = "Delimiter" > {< / span >
< span id = "L274" class = "LineNr" > 274 < / span > compare left, right
< span id = "L275" class = "LineNr" > 275 < / span > < span class = "PreProc" > break-if-> =< / span >
< span id = "L276" class = "LineNr" > 276 < / span > < span class = "Delimiter" > {< / span >
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< span id = "L277" class = "LineNr" > 277 < / span > < span class = "PreProc" > var< / span > l-a/< span class = "muRegEcx" > ecx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, left
< span id = "L278" class = "LineNr" > 278 < / span > < span class = "PreProc" > var< / span > r-a/< span class = "muRegEdx" > edx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, right
< span id = "L279" class = "LineNr" > 279 < / span > < span class = "PreProc" > var< / span > l/< span class = "muRegEbx" > ebx< / span > : byte < span class = "Special" > < -< / span > copy-byte *l-a
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< span id = "L280" class = "LineNr" > 280 < / span > < span class = "PreProc" > var< / span > r/eax: byte < span class = "Special" > < -< / span > copy-byte *r-a
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< span id = "L281" class = "LineNr" > 281 < / span > copy-byte-to *l-a, r
< span id = "L282" class = "LineNr" > 282 < / span > copy-byte-to *r-a, l
< span id = "L283" class = "LineNr" > 283 < / span > < span class = "Delimiter" > }< / span >
< span id = "L284" class = "LineNr" > 284 < / span > left < span class = "Special" > < -< / span > increment
< span id = "L285" class = "LineNr" > 285 < / span > right < span class = "Special" > < -< / span > decrement
< span id = "L286" class = "LineNr" > 286 < / span > < span class = "PreProc" > loop< / span >
< span id = "L287" class = "LineNr" > 287 < / span > < span class = "Delimiter" > }< / span >
< span id = "L288" class = "LineNr" > 288 < / span > < span class = "Delimiter" > }< / span >
< span id = "L289" class = "LineNr" > 289 < / span >
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< span id = "L290" class = "LineNr" > 290 < / span > < span class = "PreProc" > fn< / span > < span class = "muFunction" > < a href = '412render-float-decimal.mu.html#L290' > double-array-of-decimal-digits< / a > < / span > _buf: (addr array byte), _n: int< span class = "PreProc" > -> < / span > _/eax: int < span class = "Delimiter" > {< / span >
2021-06-16 04:50:13 +00:00
< span id = "L291" class = "LineNr" > 291 < / span > < span class = "PreProc" > var< / span > buf/< span class = "muRegEdi" > edi< / span > : (addr array byte) < span class = "Special" > < -< / span > copy _buf
2021-03-24 00:31:08 +00:00
< span id = "L292" class = "LineNr" > 292 < / span > < span class = "muComment" > # initialize delta< / span >
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< span id = "L293" class = "LineNr" > 293 < / span > < span class = "PreProc" > var< / span > delta/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-03-24 00:31:08 +00:00
< span id = "L294" class = "LineNr" > 294 < / span > < span class = "Delimiter" > {< / span >
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< span id = "L295" class = "LineNr" > 295 < / span > < span class = "PreProc" > var< / span > curr/< span class = "muRegEbx" > ebx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, < span class = "Constant" > 0< / span >
2021-06-27 03:55:36 +00:00
< span id = "L296" class = "LineNr" > 296 < / span > < span class = "PreProc" > var< / span > tmp/eax: byte < span class = "Special" > < -< / span > copy-byte *curr
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< span id = "L297" class = "LineNr" > 297 < / span > compare tmp, < span class = "Constant" > 5< / span >
< span id = "L298" class = "LineNr" > 298 < / span > < span class = "PreProc" > break-if-< < / span >
< span id = "L299" class = "LineNr" > 299 < / span > delta < span class = "Special" > < -< / span > copy < span class = "Constant" > 1< / span >
< span id = "L300" class = "LineNr" > 300 < / span > < span class = "Delimiter" > }< / span >
< span id = "L301" class = "LineNr" > 301 < / span > < span class = "muComment" > # loop< / span >
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< span id = "L302" class = "LineNr" > 302 < / span > < span class = "PreProc" > var< / span > x/eax: int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-06-16 04:50:13 +00:00
< span id = "L303" class = "LineNr" > 303 < / span > < span class = "PreProc" > var< / span > i/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy _n
2021-03-24 00:31:08 +00:00
< span id = "L304" class = "LineNr" > 304 < / span > i < span class = "Special" > < -< / span > decrement
< span id = "L305" class = "LineNr" > 305 < / span > < span class = "Delimiter" > {< / span >
< span id = "L306" class = "LineNr" > 306 < / span > compare i, < span class = "Constant" > 0< / span >
< span id = "L307" class = "LineNr" > 307 < / span > < span class = "PreProc" > break-if-< =< / span >
< span id = "L308" class = "LineNr" > 308 < / span > < span class = "muComment" > # x += 2*buf[i]< / span >
< span id = "L309" class = "LineNr" > 309 < / span > < span class = "Delimiter" > {< / span >
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< span id = "L310" class = "LineNr" > 310 < / span > < span class = "PreProc" > var< / span > tmp/< span class = "muRegEcx" > ecx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, i
< span id = "L311" class = "LineNr" > 311 < / span > < span class = "PreProc" > var< / span > tmp2/< span class = "muRegEcx" > ecx< / span > : byte < span class = "Special" > < -< / span > copy-byte *tmp
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< span id = "L312" class = "LineNr" > 312 < / span > x < span class = "Special" > < -< / span > add tmp2
< span id = "L313" class = "LineNr" > 313 < / span > x < span class = "Special" > < -< / span > add tmp2
< span id = "L314" class = "LineNr" > 314 < / span > < span class = "Delimiter" > }< / span >
< span id = "L315" class = "LineNr" > 315 < / span > < span class = "muComment" > # x, buf[i+delta] = x/10, x%10< / span >
< span id = "L316" class = "LineNr" > 316 < / span > < span class = "Delimiter" > {< / span >
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< span id = "L317" class = "LineNr" > 317 < / span > < span class = "PreProc" > var< / span > dest-index/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy i
2021-03-24 00:31:08 +00:00
< span id = "L318" class = "LineNr" > 318 < / span > dest-index < span class = "Special" > < -< / span > add delta
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< span id = "L319" class = "LineNr" > 319 < / span > < span class = "PreProc" > var< / span > dest/< span class = "muRegEdi" > edi< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, dest-index
< span id = "L320" class = "LineNr" > 320 < / span > < span class = "PreProc" > var< / span > next-digit/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-03-24 00:31:08 +00:00
< span id = "L321" class = "LineNr" > 321 < / span > x, next-digit < span class = "Special" > < -< / span > < a href = '314divide.subx.html#L3' > integer-divide< / a > x, < span class = "Constant" > 0xa< / span >
< span id = "L322" class = "LineNr" > 322 < / span > copy-byte-to *dest, next-digit
< span id = "L323" class = "LineNr" > 323 < / span > < span class = "Delimiter" > }< / span >
< span id = "L324" class = "LineNr" > 324 < / span > < span class = "muComment" > #< / span >
< span id = "L325" class = "LineNr" > 325 < / span > i < span class = "Special" > < -< / span > decrement
< span id = "L326" class = "LineNr" > 326 < / span > < span class = "PreProc" > loop< / span >
< span id = "L327" class = "LineNr" > 327 < / span > < span class = "Delimiter" > }< / span >
< span id = "L328" class = "LineNr" > 328 < / span > < span class = "muComment" > # final patch-up< / span >
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< span id = "L329" class = "LineNr" > 329 < / span > < span class = "PreProc" > var< / span > n/eax: int < span class = "Special" > < -< / span > copy _n
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< span id = "L330" class = "LineNr" > 330 < / span > compare delta, < span class = "Constant" > 1< / span >
< span id = "L331" class = "LineNr" > 331 < / span > < span class = "Delimiter" > {< / span >
< span id = "L332" class = "LineNr" > 332 < / span > < span class = "PreProc" > break-if-!=< / span >
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< span id = "L333" class = "LineNr" > 333 < / span > < span class = "PreProc" > var< / span > curr/< span class = "muRegEbx" > ebx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, < span class = "Constant" > 0< / span >
< span id = "L334" class = "LineNr" > 334 < / span > < span class = "PreProc" > var< / span > one/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 1< / span >
2021-03-24 00:31:08 +00:00
< span id = "L335" class = "LineNr" > 335 < / span > copy-byte-to *curr, one
< span id = "L336" class = "LineNr" > 336 < / span > n < span class = "Special" > < -< / span > increment
< span id = "L337" class = "LineNr" > 337 < / span > < span class = "Delimiter" > }< / span >
< span id = "L338" class = "LineNr" > 338 < / span > < span class = "PreProc" > return< / span > n
< span id = "L339" class = "LineNr" > 339 < / span > < span class = "Delimiter" > }< / span >
< span id = "L340" class = "LineNr" > 340 < / span >
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< span id = "L341" class = "LineNr" > 341 < / span > < span class = "PreProc" > fn< / span > < span class = "muFunction" > < a href = '412render-float-decimal.mu.html#L341' > halve-array-of-decimal-digits< / a > < / span > _buf: (addr array byte), _n: int, _dp: int< span class = "PreProc" > -> < / span > _/eax: int, _/< span class = "muRegEdx" > edx< / span > : int < span class = "Delimiter" > {< / span >
2021-06-16 04:50:13 +00:00
< span id = "L342" class = "LineNr" > 342 < / span > < span class = "PreProc" > var< / span > buf/< span class = "muRegEdi" > edi< / span > : (addr array byte) < span class = "Special" > < -< / span > copy _buf
2021-06-27 03:55:36 +00:00
< span id = "L343" class = "LineNr" > 343 < / span > < span class = "PreProc" > var< / span > n/eax: int < span class = "Special" > < -< / span > copy _n
2021-06-16 04:50:13 +00:00
< span id = "L344" class = "LineNr" > 344 < / span > < span class = "PreProc" > var< / span > dp/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy _dp
2021-03-24 00:31:08 +00:00
< span id = "L345" class = "LineNr" > 345 < / span > < span class = "muComment" > # initialize one side< / span >
< span id = "L346" class = "LineNr" > 346 < / span > < span class = "Delimiter" > {< / span >
< span id = "L347" class = "LineNr" > 347 < / span > < span class = "muComment" > # if buf[n-1]%2 == 0, break< / span >
2021-06-16 04:50:13 +00:00
< span id = "L348" class = "LineNr" > 348 < / span > < span class = "PreProc" > var< / span > right-index/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy n
2021-03-24 00:31:08 +00:00
< span id = "L349" class = "LineNr" > 349 < / span > right-index < span class = "Special" > < -< / span > decrement
2021-06-16 04:50:13 +00:00
< span id = "L350" class = "LineNr" > 350 < / span > < span class = "PreProc" > var< / span > right-a/< span class = "muRegEcx" > ecx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, right-index
< span id = "L351" class = "LineNr" > 351 < / span > < span class = "PreProc" > var< / span > right/< span class = "muRegEcx" > ecx< / span > : byte < span class = "Special" > < -< / span > copy-byte *right-a
< span id = "L352" class = "LineNr" > 352 < / span > < span class = "PreProc" > var< / span > right-int/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy right
< span id = "L353" class = "LineNr" > 353 < / span > < span class = "PreProc" > var< / span > remainder/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-03-24 00:31:08 +00:00
< span id = "L354" class = "LineNr" > 354 < / span > < span class = "Delimiter" > {< / span >
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< span id = "L355" class = "LineNr" > 355 < / span > < span class = "PreProc" > var< / span > dummy/eax: int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-03-24 00:31:08 +00:00
< span id = "L356" class = "LineNr" > 356 < / span > dummy, remainder < span class = "Special" > < -< / span > < a href = '314divide.subx.html#L3' > integer-divide< / a > right-int, < span class = "Constant" > 2< / span >
< span id = "L357" class = "LineNr" > 357 < / span > < span class = "Delimiter" > }< / span >
< span id = "L358" class = "LineNr" > 358 < / span > compare remainder, < span class = "Constant" > 0< / span >
< span id = "L359" class = "LineNr" > 359 < / span > < span class = "PreProc" > break-if-=< / span >
< span id = "L360" class = "LineNr" > 360 < / span > < span class = "muComment" > # buf[n] = 0< / span >
2021-06-16 04:50:13 +00:00
< span id = "L361" class = "LineNr" > 361 < / span > < span class = "PreProc" > var< / span > next-a/< span class = "muRegEcx" > ecx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, n
< span id = "L362" class = "LineNr" > 362 < / span > < span class = "PreProc" > var< / span > zero/< span class = "muRegEdx" > edx< / span > : byte < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-03-24 00:31:08 +00:00
< span id = "L363" class = "LineNr" > 363 < / span > copy-byte-to *next-a, zero
< span id = "L364" class = "LineNr" > 364 < / span > < span class = "muComment" > # n++< / span >
< span id = "L365" class = "LineNr" > 365 < / span > n < span class = "Special" > < -< / span > increment
< span id = "L366" class = "LineNr" > 366 < / span > < span class = "Delimiter" > }< / span >
< span id = "L367" class = "LineNr" > 367 < / span > < span class = "muComment" > # initialize the other< / span >
2021-06-16 04:50:13 +00:00
< span id = "L368" class = "LineNr" > 368 < / span > < span class = "PreProc" > var< / span > delta/< span class = "muRegEbx" > ebx< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
< span id = "L369" class = "LineNr" > 369 < / span > < span class = "PreProc" > var< / span > x/< span class = "muRegEsi" > esi< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-03-24 00:31:08 +00:00
< span id = "L370" class = "LineNr" > 370 < / span > < span class = "Delimiter" > {< / span >
< span id = "L371" class = "LineNr" > 371 < / span > < span class = "muComment" > # if buf[0] > = 2, break< / span >
2021-06-16 04:50:13 +00:00
< span id = "L372" class = "LineNr" > 372 < / span > < span class = "PreProc" > var< / span > left/< span class = "muRegEcx" > ecx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, < span class = "Constant" > 0< / span >
< span id = "L373" class = "LineNr" > 373 < / span > < span class = "PreProc" > var< / span > src/< span class = "muRegEcx" > ecx< / span > : byte < span class = "Special" > < -< / span > copy-byte *left
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< span id = "L374" class = "LineNr" > 374 < / span > compare src, < span class = "Constant" > 2< / span >
< span id = "L375" class = "LineNr" > 375 < / span > < span class = "PreProc" > break-if-> =< / span >
< span id = "L376" class = "LineNr" > 376 < / span > < span class = "muComment" > # delta, x = 1, buf[0]< / span >
< span id = "L377" class = "LineNr" > 377 < / span > delta < span class = "Special" > < -< / span > copy < span class = "Constant" > 1< / span >
< span id = "L378" class = "LineNr" > 378 < / span > x < span class = "Special" > < -< / span > copy src
< span id = "L379" class = "LineNr" > 379 < / span > < span class = "muComment" > # n--< / span >
< span id = "L380" class = "LineNr" > 380 < / span > n < span class = "Special" > < -< / span > decrement
< span id = "L381" class = "LineNr" > 381 < / span > < span class = "muComment" > # dp--< / span >
< span id = "L382" class = "LineNr" > 382 < / span > dp < span class = "Special" > < -< / span > decrement
< span id = "L383" class = "LineNr" > 383 < / span > < span class = "Delimiter" > }< / span >
< span id = "L384" class = "LineNr" > 384 < / span > < span class = "muComment" > # loop< / span >
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< span id = "L385" class = "LineNr" > 385 < / span > < span class = "PreProc" > var< / span > i/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-03-24 00:31:08 +00:00
< span id = "L386" class = "LineNr" > 386 < / span > < span class = "Delimiter" > {< / span >
< span id = "L387" class = "LineNr" > 387 < / span > compare i, n
< span id = "L388" class = "LineNr" > 388 < / span > < span class = "PreProc" > break-if-> =< / span >
< span id = "L389" class = "LineNr" > 389 < / span > < span class = "muComment" > # x = x*10 + buf[i+delta]< / span >
< span id = "L390" class = "LineNr" > 390 < / span > < span class = "Delimiter" > {< / span >
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< span id = "L391" class = "LineNr" > 391 < / span > < span class = "PreProc" > var< / span > ten/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0xa< / span >
2021-03-24 00:31:08 +00:00
< span id = "L392" class = "LineNr" > 392 < / span > x < span class = "Special" > < -< / span > multiply ten
2021-06-16 04:50:13 +00:00
< span id = "L393" class = "LineNr" > 393 < / span > < span class = "PreProc" > var< / span > src-index/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy i
2021-03-24 00:31:08 +00:00
< span id = "L394" class = "LineNr" > 394 < / span > src-index < span class = "Special" > < -< / span > add delta
2021-06-16 04:50:13 +00:00
< span id = "L395" class = "LineNr" > 395 < / span > < span class = "PreProc" > var< / span > src-a/< span class = "muRegEdx" > edx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, src-index
< span id = "L396" class = "LineNr" > 396 < / span > < span class = "PreProc" > var< / span > src/< span class = "muRegEdx" > edx< / span > : byte < span class = "Special" > < -< / span > copy-byte *src-a
2021-03-24 00:31:08 +00:00
< span id = "L397" class = "LineNr" > 397 < / span > x < span class = "Special" > < -< / span > add src
< span id = "L398" class = "LineNr" > 398 < / span > < span class = "Delimiter" > }< / span >
< span id = "L399" class = "LineNr" > 399 < / span > < span class = "muComment" > # buf[i], x = x/2, x%2< / span >
< span id = "L400" class = "LineNr" > 400 < / span > < span class = "Delimiter" > {< / span >
2021-06-27 03:55:36 +00:00
< span id = "L401" class = "LineNr" > 401 < / span > < span class = "PreProc" > var< / span > quotient/eax: int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-06-16 04:50:13 +00:00
< span id = "L402" class = "LineNr" > 402 < / span > < span class = "PreProc" > var< / span > remainder/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-03-24 00:31:08 +00:00
< span id = "L403" class = "LineNr" > 403 < / span > quotient, remainder < span class = "Special" > < -< / span > < a href = '314divide.subx.html#L3' > integer-divide< / a > x, < span class = "Constant" > 2< / span >
< span id = "L404" class = "LineNr" > 404 < / span > x < span class = "Special" > < -< / span > copy remainder
2021-06-16 04:50:13 +00:00
< span id = "L405" class = "LineNr" > 405 < / span > < span class = "PreProc" > var< / span > dest/< span class = "muRegEdx" > edx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, i
2021-03-24 00:31:08 +00:00
< span id = "L406" class = "LineNr" > 406 < / span > copy-byte-to *dest, quotient
< span id = "L407" class = "LineNr" > 407 < / span > < span class = "Delimiter" > }< / span >
< span id = "L408" class = "LineNr" > 408 < / span > < span class = "muComment" > #< / span >
< span id = "L409" class = "LineNr" > 409 < / span > i < span class = "Special" > < -< / span > increment
< span id = "L410" class = "LineNr" > 410 < / span > < span class = "PreProc" > loop< / span >
< span id = "L411" class = "LineNr" > 411 < / span > < span class = "Delimiter" > }< / span >
< span id = "L412" class = "LineNr" > 412 < / span > < span class = "PreProc" > return< / span > n, dp
< span id = "L413" class = "LineNr" > 413 < / span > < span class = "Delimiter" > }< / span >
< span id = "L414" class = "LineNr" > 414 < / span >
< span id = "L415" class = "LineNr" > 415 < / span > < span class = "PreProc" > fn< / span > < span class = "muFunction" > < a href = '412render-float-decimal.mu.html#L415' > _write-float-array-of-decimal-digits< / a > < / span > out: (addr stream byte), _buf: (addr array byte), n: int, dp: int, precision: int < span class = "Delimiter" > {< / span >
2021-06-16 04:50:13 +00:00
< span id = "L416" class = "LineNr" > 416 < / span > < span class = "PreProc" > var< / span > buf/< span class = "muRegEdi" > edi< / span > : (addr array byte) < span class = "Special" > < -< / span > copy _buf
2021-03-24 00:31:08 +00:00
< span id = "L417" class = "LineNr" > 417 < / span > < span class = "Delimiter" > {< / span >
< span id = "L418" class = "LineNr" > 418 < / span > compare dp, < span class = "Constant" > 0< / span >
< span id = "L419" class = "LineNr" > 419 < / span > < span class = "PreProc" > break-if-> =< / span >
< span id = "L420" class = "LineNr" > 420 < / span > < a href = '412render-float-decimal.mu.html#L464' > _write-float-array-of-decimal-digits-in-scientific-notation< / a > out, buf, n, dp, precision
< span id = "L421" class = "LineNr" > 421 < / span > < span class = "PreProc" > return< / span >
< span id = "L422" class = "LineNr" > 422 < / span > < span class = "Delimiter" > }< / span >
< span id = "L423" class = "LineNr" > 423 < / span > < span class = "Delimiter" > {< / span >
2021-06-27 03:55:36 +00:00
< span id = "L424" class = "LineNr" > 424 < / span > < span class = "PreProc" > var< / span > dp2/eax: int < span class = "Special" > < -< / span > copy dp
2021-03-24 00:31:08 +00:00
< span id = "L425" class = "LineNr" > 425 < / span > compare dp2, precision
< span id = "L426" class = "LineNr" > 426 < / span > < span class = "PreProc" > break-if-< =< / span >
< span id = "L427" class = "LineNr" > 427 < / span > < a href = '412render-float-decimal.mu.html#L464' > _write-float-array-of-decimal-digits-in-scientific-notation< / a > out, buf, n, dp, precision
< span id = "L428" class = "LineNr" > 428 < / span > < span class = "PreProc" > return< / span >
< span id = "L429" class = "LineNr" > 429 < / span > < span class = "Delimiter" > }< / span >
< span id = "L430" class = "LineNr" > 430 < / span > < span class = "Delimiter" > {< / span >
< span id = "L431" class = "LineNr" > 431 < / span > compare dp, < span class = "Constant" > 0< / span >
< span id = "L432" class = "LineNr" > 432 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L433" class = "LineNr" > 433 < / span > < a href = '115write-byte.subx.html#L12' > append-byte< / a > out, < span class = "Constant" > 0x30< / span > /< span class = "Constant" > 0< / span >
< span id = "L434" class = "LineNr" > 434 < / span > < span class = "Delimiter" > }< / span >
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< span id = "L435" class = "LineNr" > 435 < / span > < span class = "PreProc" > var< / span > i/eax: int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-03-24 00:31:08 +00:00
< span id = "L436" class = "LineNr" > 436 < / span > < span class = "muComment" > # bounds = min(n, dp+3)< / span >
2021-06-16 04:50:13 +00:00
< span id = "L437" class = "LineNr" > 437 < / span > < span class = "PreProc" > var< / span > limit/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy dp
2021-03-24 00:31:08 +00:00
< span id = "L438" class = "LineNr" > 438 < / span > limit < span class = "Special" > < -< / span > add < span class = "Constant" > 3< / span >
< span id = "L439" class = "LineNr" > 439 < / span > < span class = "Delimiter" > {< / span >
< span id = "L440" class = "LineNr" > 440 < / span > compare limit, n
< span id = "L441" class = "LineNr" > 441 < / span > < span class = "PreProc" > break-if-< =< / span >
< span id = "L442" class = "LineNr" > 442 < / span > limit < span class = "Special" > < -< / span > copy n
< span id = "L443" class = "LineNr" > 443 < / span > < span class = "Delimiter" > }< / span >
< span id = "L444" class = "LineNr" > 444 < / span > < span class = "Delimiter" > {< / span >
< span id = "L445" class = "LineNr" > 445 < / span > compare i, limit
< span id = "L446" class = "LineNr" > 446 < / span > < span class = "PreProc" > break-if-> =< / span >
< span id = "L447" class = "LineNr" > 447 < / span > < span class = "muComment" > # print '.' if necessary< / span >
< span id = "L448" class = "LineNr" > 448 < / span > compare i, dp
< span id = "L449" class = "LineNr" > 449 < / span > < span class = "Delimiter" > {< / span >
< span id = "L450" class = "LineNr" > 450 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L451" class = "LineNr" > 451 < / span > < a href = '115write-byte.subx.html#L12' > append-byte< / a > out, < span class = "Constant" > 0x2e< / span > /decimal-point
< span id = "L452" class = "LineNr" > 452 < / span > < span class = "Delimiter" > }< / span >
2021-06-16 04:50:13 +00:00
< span id = "L453" class = "LineNr" > 453 < / span > < span class = "PreProc" > var< / span > curr-a/< span class = "muRegEcx" > ecx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, i
< span id = "L454" class = "LineNr" > 454 < / span > < span class = "PreProc" > var< / span > curr/< span class = "muRegEcx" > ecx< / span > : byte < span class = "Special" > < -< / span > copy-byte *curr-a
< span id = "L455" class = "LineNr" > 455 < / span > < span class = "PreProc" > var< / span > curr-int/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy curr
2021-03-24 00:31:08 +00:00
< span id = "L456" class = "LineNr" > 456 < / span > curr-int < span class = "Special" > < -< / span > add < span class = "Constant" > 0x30< / span > /< span class = "Constant" > 0< / span >
< span id = "L457" class = "LineNr" > 457 < / span > < a href = '115write-byte.subx.html#L12' > append-byte< / a > out, curr-int
< span id = "L458" class = "LineNr" > 458 < / span > < span class = "muComment" > #< / span >
< span id = "L459" class = "LineNr" > 459 < / span > i < span class = "Special" > < -< / span > increment
< span id = "L460" class = "LineNr" > 460 < / span > < span class = "PreProc" > loop< / span >
< span id = "L461" class = "LineNr" > 461 < / span > < span class = "Delimiter" > }< / span >
< span id = "L462" class = "LineNr" > 462 < / span > < span class = "Delimiter" > }< / span >
< span id = "L463" class = "LineNr" > 463 < / span >
< span id = "L464" class = "LineNr" > 464 < / span > < span class = "PreProc" > fn< / span > < span class = "muFunction" > < a href = '412render-float-decimal.mu.html#L464' > _write-float-array-of-decimal-digits-in-scientific-notation< / a > < / span > out: (addr stream byte), _buf: (addr array byte), n: int, dp: int, precision: int < span class = "Delimiter" > {< / span >
2021-06-16 04:50:13 +00:00
< span id = "L465" class = "LineNr" > 465 < / span > < span class = "PreProc" > var< / span > buf/< span class = "muRegEdi" > edi< / span > : (addr array byte) < span class = "Special" > < -< / span > copy _buf
2021-06-27 03:55:36 +00:00
< span id = "L466" class = "LineNr" > 466 < / span > < span class = "PreProc" > var< / span > i/eax: int < span class = "Special" > < -< / span > copy < span class = "Constant" > 0< / span >
2021-03-24 00:31:08 +00:00
< span id = "L467" class = "LineNr" > 467 < / span > < span class = "Delimiter" > {< / span >
< span id = "L468" class = "LineNr" > 468 < / span > compare i, n
< span id = "L469" class = "LineNr" > 469 < / span > < span class = "PreProc" > break-if-> =< / span >
< span id = "L470" class = "LineNr" > 470 < / span > compare i, precision
< span id = "L471" class = "LineNr" > 471 < / span > < span class = "PreProc" > break-if-> =< / span >
< span id = "L472" class = "LineNr" > 472 < / span > compare i, < span class = "Constant" > 1< / span >
< span id = "L473" class = "LineNr" > 473 < / span > < span class = "Delimiter" > {< / span >
< span id = "L474" class = "LineNr" > 474 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L475" class = "LineNr" > 475 < / span > < a href = '115write-byte.subx.html#L12' > append-byte< / a > out, < span class = "Constant" > 0x2e< / span > /decimal-point
< span id = "L476" class = "LineNr" > 476 < / span > < span class = "Delimiter" > }< / span >
2021-06-16 04:50:13 +00:00
< span id = "L477" class = "LineNr" > 477 < / span > < span class = "PreProc" > var< / span > curr-a/< span class = "muRegEcx" > ecx< / span > : (addr byte) < span class = "Special" > < -< / span > index buf, i
< span id = "L478" class = "LineNr" > 478 < / span > < span class = "PreProc" > var< / span > curr/< span class = "muRegEcx" > ecx< / span > : byte < span class = "Special" > < -< / span > copy-byte *curr-a
< span id = "L479" class = "LineNr" > 479 < / span > < span class = "PreProc" > var< / span > curr-int/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy curr
2021-03-24 00:31:08 +00:00
< span id = "L480" class = "LineNr" > 480 < / span > curr-int < span class = "Special" > < -< / span > add < span class = "Constant" > 0x30< / span > /< span class = "Constant" > 0< / span >
< span id = "L481" class = "LineNr" > 481 < / span > < a href = '115write-byte.subx.html#L12' > append-byte< / a > out, curr-int
< span id = "L482" class = "LineNr" > 482 < / span > < span class = "muComment" > #< / span >
< span id = "L483" class = "LineNr" > 483 < / span > i < span class = "Special" > < -< / span > increment
< span id = "L484" class = "LineNr" > 484 < / span > < span class = "PreProc" > loop< / span >
< span id = "L485" class = "LineNr" > 485 < / span > < span class = "Delimiter" > }< / span >
< span id = "L486" class = "LineNr" > 486 < / span > < a href = '115write-byte.subx.html#L12' > append-byte< / a > out, < span class = "Constant" > 0x65< / span > /e
< span id = "L487" class = "LineNr" > 487 < / span > decrement dp
< span id = "L488" class = "LineNr" > 488 < / span > < a href = '126write-int-decimal.subx.html#L8' > write-int32-decimal< / a > out, dp
< span id = "L489" class = "LineNr" > 489 < / span > < span class = "Delimiter" > }< / span >
< span id = "L490" class = "LineNr" > 490 < / span >
< span id = "L491" class = "LineNr" > 491 < / span > < span class = "muComment" > # follows the structure of write-float-decimal-approximate< / span >
< span id = "L492" class = "LineNr" > 492 < / span > < span class = "muComment" > # 'precision' controls the maximum width past which we resort to scientific notation< / span >
2021-06-27 03:55:36 +00:00
< span id = "L493" class = "LineNr" > 493 < / span > < span class = "PreProc" > fn< / span > < span class = "muFunction" > < a href = '412render-float-decimal.mu.html#L493' > float-size< / a > < / span > in: float, precision: int< span class = "PreProc" > -> < / span > _/eax: int < span class = "Delimiter" > {< / span >
2021-03-24 00:31:08 +00:00
< span id = "L494" class = "LineNr" > 494 < / span > < span class = "muComment" > # - special names< / span >
2021-06-27 03:55:36 +00:00
< span id = "L495" class = "LineNr" > 495 < / span > < span class = "PreProc" > var< / span > bits/eax: int < span class = "Special" > < -< / span > reinterpret in
2021-03-24 00:31:08 +00:00
< span id = "L496" class = "LineNr" > 496 < / span > compare bits, < span class = "Constant" > 0< / span >
< span id = "L497" class = "LineNr" > 497 < / span > < span class = "Delimiter" > {< / span >
< span id = "L498" class = "LineNr" > 498 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L499" class = "LineNr" > 499 < / span > < span class = "PreProc" > return< / span > < span class = "Constant" > 1< / span > < span class = "muComment" > # for " 0" < / span >
< span id = "L500" class = "LineNr" > 500 < / span > < span class = "Delimiter" > }< / span >
< span id = "L501" class = "LineNr" > 501 < / span > compare bits, < span class = "Constant" > 0x80000000< / span >
< span id = "L502" class = "LineNr" > 502 < / span > < span class = "Delimiter" > {< / span >
< span id = "L503" class = "LineNr" > 503 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L504" class = "LineNr" > 504 < / span > < span class = "PreProc" > return< / span > < span class = "Constant" > 2< / span > < span class = "muComment" > # for " -0" < / span >
< span id = "L505" class = "LineNr" > 505 < / span > < span class = "Delimiter" > }< / span >
< span id = "L506" class = "LineNr" > 506 < / span > compare bits, < span class = "Constant" > 0x7f800000< / span >
< span id = "L507" class = "LineNr" > 507 < / span > < span class = "Delimiter" > {< / span >
< span id = "L508" class = "LineNr" > 508 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L509" class = "LineNr" > 509 < / span > < span class = "PreProc" > return< / span > < span class = "Constant" > 3< / span > < span class = "muComment" > # for " Inf" < / span >
< span id = "L510" class = "LineNr" > 510 < / span > < span class = "Delimiter" > }< / span >
< span id = "L511" class = "LineNr" > 511 < / span > compare bits, < span class = "Constant" > 0xff800000< / span >
< span id = "L512" class = "LineNr" > 512 < / span > < span class = "Delimiter" > {< / span >
< span id = "L513" class = "LineNr" > 513 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L514" class = "LineNr" > 514 < / span > < span class = "PreProc" > return< / span > < span class = "Constant" > 4< / span > < span class = "muComment" > # for " -Inf" < / span >
< span id = "L515" class = "LineNr" > 515 < / span > < span class = "Delimiter" > }< / span >
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< span id = "L516" class = "LineNr" > 516 < / span > < span class = "PreProc" > var< / span > exponent/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy bits
2021-03-24 00:31:08 +00:00
< span id = "L517" class = "LineNr" > 517 < / span > exponent < span class = "Special" > < -< / span > shift-right < span class = "Constant" > 0x17< / span > < span class = "muComment" > # 23 bits of mantissa< / span >
< span id = "L518" class = "LineNr" > 518 < / span > exponent < span class = "Special" > < -< / span > and < span class = "Constant" > 0xff< / span >
< span id = "L519" class = "LineNr" > 519 < / span > exponent < span class = "Special" > < -< / span > subtract < span class = "Constant" > 0x7f< / span >
< span id = "L520" class = "LineNr" > 520 < / span > compare exponent, < span class = "Constant" > 0x80< / span >
< span id = "L521" class = "LineNr" > 521 < / span > < span class = "Delimiter" > {< / span >
< span id = "L522" class = "LineNr" > 522 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L523" class = "LineNr" > 523 < / span > < span class = "PreProc" > return< / span > < span class = "Constant" > 3< / span > < span class = "muComment" > # for " NaN" < / span >
< span id = "L524" class = "LineNr" > 524 < / span > < span class = "Delimiter" > }< / span >
< span id = "L525" class = "LineNr" > 525 < / span > < span class = "muComment" > # - regular numbers< / span >
< span id = "L526" class = "LineNr" > 526 < / span > < span class = "muComment" > # v = 1.mantissa (in base 2) < < 0x17< / span >
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< span id = "L527" class = "LineNr" > 527 < / span > < span class = "PreProc" > var< / span > v/< span class = "muRegEbx" > ebx< / span > : int < span class = "Special" > < -< / span > copy bits
2021-03-24 00:31:08 +00:00
< span id = "L528" class = "LineNr" > 528 < / span > v < span class = "Special" > < -< / span > and < span class = "Constant" > 0x7fffff< / span >
< span id = "L529" class = "LineNr" > 529 < / span > v < span class = "Special" > < -< / span > or < span class = "Constant" > 0x00800000< / span > < span class = "muComment" > # insert implicit 1< / span >
< span id = "L530" class = "LineNr" > 530 < / span > < span class = "muComment" > # e = exponent - 0x17< / span >
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< span id = "L531" class = "LineNr" > 531 < / span > < span class = "PreProc" > var< / span > e/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy exponent
2021-03-24 00:31:08 +00:00
< span id = "L532" class = "LineNr" > 532 < / span > e < span class = "Special" > < -< / span > subtract < span class = "Constant" > 0x17< / span > < span class = "muComment" > # move decimal place from before mantissa to after< / span >
< span id = "L533" class = "LineNr" > 533 < / span >
< span id = "L534" class = "LineNr" > 534 < / span > < span class = "muComment" > # initialize buffer with decimal representation of v< / span >
< span id = "L535" class = "LineNr" > 535 < / span > < span class = "PreProc" > var< / span > buf-storage: (array byte < span class = "Constant" > 0x7f< / span > )
2021-06-16 04:50:13 +00:00
< span id = "L536" class = "LineNr" > 536 < / span > < span class = "PreProc" > var< / span > buf/< span class = "muRegEdi" > edi< / span > : (addr array byte) < span class = "Special" > < -< / span > address buf-storage
2021-06-27 03:55:36 +00:00
< span id = "L537" class = "LineNr" > 537 < / span > < span class = "PreProc" > var< / span > n/eax: int < span class = "Special" > < -< / span > < a href = '412render-float-decimal.mu.html#L251' > decimal-digits< / a > v, buf
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< span id = "L538" class = "LineNr" > 538 < / span > < a href = '412render-float-decimal.mu.html#L268' > reverse-digits< / a > buf, n
< span id = "L539" class = "LineNr" > 539 < / span >
< span id = "L540" class = "LineNr" > 540 < / span > < span class = "muComment" > # loop if e > 0< / span >
< span id = "L541" class = "LineNr" > 541 < / span > < span class = "Delimiter" > {< / span >
< span id = "L542" class = "LineNr" > 542 < / span > compare e, < span class = "Constant" > 0< / span >
< span id = "L543" class = "LineNr" > 543 < / span > < span class = "PreProc" > break-if-< =< / span >
< span id = "L544" class = "LineNr" > 544 < / span > n < span class = "Special" > < -< / span > < a href = '412render-float-decimal.mu.html#L290' > double-array-of-decimal-digits< / a > buf, n
< span id = "L545" class = "LineNr" > 545 < / span > e < span class = "Special" > < -< / span > decrement
< span id = "L546" class = "LineNr" > 546 < / span > < span class = "PreProc" > loop< / span >
< span id = "L547" class = "LineNr" > 547 < / span > < span class = "Delimiter" > }< / span >
< span id = "L548" class = "LineNr" > 548 < / span >
2021-06-16 04:50:13 +00:00
< span id = "L549" class = "LineNr" > 549 < / span > < span class = "PreProc" > var< / span > dp/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > copy n
2021-03-24 00:31:08 +00:00
< span id = "L550" class = "LineNr" > 550 < / span >
< span id = "L551" class = "LineNr" > 551 < / span > < span class = "muComment" > # loop if e < 0< / span >
< span id = "L552" class = "LineNr" > 552 < / span > < span class = "Delimiter" > {< / span >
< span id = "L553" class = "LineNr" > 553 < / span > compare e, < span class = "Constant" > 0< / span >
< span id = "L554" class = "LineNr" > 554 < / span > < span class = "PreProc" > break-if-> =< / span >
< span id = "L555" class = "LineNr" > 555 < / span > n, dp < span class = "Special" > < -< / span > < a href = '412render-float-decimal.mu.html#L341' > halve-array-of-decimal-digits< / a > buf, n, dp
< span id = "L556" class = "LineNr" > 556 < / span > e < span class = "Special" > < -< / span > increment
< span id = "L557" class = "LineNr" > 557 < / span > < span class = "PreProc" > loop< / span >
< span id = "L558" class = "LineNr" > 558 < / span > < span class = "Delimiter" > }< / span >
< span id = "L559" class = "LineNr" > 559 < / span >
< span id = "L560" class = "LineNr" > 560 < / span > compare dp, < span class = "Constant" > 0< / span >
< span id = "L561" class = "LineNr" > 561 < / span > < span class = "Delimiter" > {< / span >
< span id = "L562" class = "LineNr" > 562 < / span > < span class = "PreProc" > break-if-> =< / span >
< span id = "L563" class = "LineNr" > 563 < / span > < span class = "PreProc" > return< / span > < span class = "Constant" > 8< / span > < span class = "muComment" > # hacky for scientific notation< / span >
< span id = "L564" class = "LineNr" > 564 < / span > < span class = "Delimiter" > }< / span >
< span id = "L565" class = "LineNr" > 565 < / span > < span class = "Delimiter" > {< / span >
2021-06-27 03:55:36 +00:00
< span id = "L566" class = "LineNr" > 566 < / span > < span class = "PreProc" > var< / span > dp2/eax: int < span class = "Special" > < -< / span > copy dp
2021-03-24 00:31:08 +00:00
< span id = "L567" class = "LineNr" > 567 < / span > compare dp2, precision
< span id = "L568" class = "LineNr" > 568 < / span > < span class = "PreProc" > break-if-< =< / span >
< span id = "L569" class = "LineNr" > 569 < / span > < span class = "PreProc" > return< / span > < span class = "Constant" > 8< / span > < span class = "muComment" > # hacky for scientific notation< / span >
< span id = "L570" class = "LineNr" > 570 < / span > < span class = "Delimiter" > }< / span >
< span id = "L571" class = "LineNr" > 571 < / span >
< span id = "L572" class = "LineNr" > 572 < / span > < span class = "muComment" > # result = min(n, dp+3)< / span >
2021-06-16 04:50:13 +00:00
< span id = "L573" class = "LineNr" > 573 < / span > < span class = "PreProc" > var< / span > result/< span class = "muRegEcx" > ecx< / span > : int < span class = "Special" > < -< / span > copy dp
2021-03-24 00:31:08 +00:00
< span id = "L574" class = "LineNr" > 574 < / span > result < span class = "Special" > < -< / span > add < span class = "Constant" > 3< / span >
< span id = "L575" class = "LineNr" > 575 < / span > < span class = "Delimiter" > {< / span >
< span id = "L576" class = "LineNr" > 576 < / span > compare result, n
< span id = "L577" class = "LineNr" > 577 < / span > < span class = "PreProc" > break-if-< =< / span >
< span id = "L578" class = "LineNr" > 578 < / span > result < span class = "Special" > < -< / span > copy n
< span id = "L579" class = "LineNr" > 579 < / span > < span class = "Delimiter" > }< / span >
< span id = "L580" class = "LineNr" > 580 < / span >
< span id = "L581" class = "LineNr" > 581 < / span > < span class = "muComment" > # account for decimal point< / span >
< span id = "L582" class = "LineNr" > 582 < / span > compare dp, n
< span id = "L583" class = "LineNr" > 583 < / span > < span class = "Delimiter" > {< / span >
< span id = "L584" class = "LineNr" > 584 < / span > < span class = "PreProc" > break-if-> =< / span >
< span id = "L585" class = "LineNr" > 585 < / span > result < span class = "Special" > < -< / span > increment
< span id = "L586" class = "LineNr" > 586 < / span > < span class = "Delimiter" > }< / span >
< span id = "L587" class = "LineNr" > 587 < / span >
< span id = "L588" class = "LineNr" > 588 < / span > < span class = "muComment" > # account for sign< / span >
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< span id = "L589" class = "LineNr" > 589 < / span > < span class = "PreProc" > var< / span > sign/< span class = "muRegEdx" > edx< / span > : int < span class = "Special" > < -< / span > reinterpret in
2021-03-24 00:31:08 +00:00
< span id = "L590" class = "LineNr" > 590 < / span > sign < span class = "Special" > < -< / span > shift-right < span class = "Constant" > 0x1f< / span >
< span id = "L591" class = "LineNr" > 591 < / span > < span class = "Delimiter" > {< / span >
< span id = "L592" class = "LineNr" > 592 < / span > compare sign, < span class = "Constant" > 1< / span >
< span id = "L593" class = "LineNr" > 593 < / span > < span class = "PreProc" > break-if-!=< / span >
< span id = "L594" class = "LineNr" > 594 < / span > result < span class = "Special" > < -< / span > increment
< span id = "L595" class = "LineNr" > 595 < / span > < span class = "Delimiter" > }< / span >
< span id = "L596" class = "LineNr" > 596 < / span > < span class = "PreProc" > return< / span > result
< span id = "L597" class = "LineNr" > 597 < / span > < span class = "Delimiter" > }< / span >
< / pre >
< / body >
< / html >
<!-- vim: set foldmethod=manual : -->