6946 - print floats somewhat intuitively in hex
This commit is contained in:
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0371140abe
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b8d613e7c2
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@ -176,24 +176,9 @@ test-write-byte-hex-buffered:
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c3/return
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write-int32-hex: # f: (addr stream byte), n: int
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# pseudocode:
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# write(f, "0x")
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# ecx = 28
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# while true
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# if (ecx < 0) break
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# eax = n >> ecx
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# eax = eax & 0xf
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# append-byte(f, AL)
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# ecx -= 4
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#
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# . save registers
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50/push-eax
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51/push-ecx
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# ecx = 28
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b9/copy-to-ecx 0x1c/imm32
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$write-int32-hex:hex-prefix:
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# write(f, "0x")
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# . . push args
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@ -203,11 +188,48 @@ $write-int32-hex:hex-prefix:
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e8/call write/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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$write-int32-hex:loop:
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# if (ecx < 0) break
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$write-int32-hex:rest:
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# write-int32-hex-bits(f, n, 32)
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# . . push args
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68/push 0x20/imm32
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
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# . . call
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e8/call write-int32-hex-bits/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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$write-int32-hex:end:
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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# print rightmost 'bits' of 'n'
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# bits must be multiple of 4
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write-int32-hex-bits: # f: (addr stream byte), n: int, bits: int
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# pseudocode:
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# bits -= 4
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# while true
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# if (bits < 0) break
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# eax = n >> bits
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# eax = eax & 0xf
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# append-byte(f, AL)
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# bits -= 4
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#
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# . save registers
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50/push-eax
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51/push-ecx
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# ecx = bits-4
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 1/r32/ecx 0x10/disp8 . # copy *(ebp+16) to ecx
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81 5/subop/subtract 3/mod/direct 1/rm32/ecx . . . . . 4/imm32 # subtract from ecx
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$write-int32-hex-bits:loop:
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# if (bits < 0) break
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81 7/subop/compare 3/mod/direct 1/rm32/ecx . . . . . 0/imm32 # compare ecx
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7c/jump-if-< $write-int32-hex:end/disp8
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# eax = n >> ecx
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7c/jump-if-< $write-int32-hex-bits:end/disp8
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# eax = n >> bits
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0xc/disp8 . # copy *(ebp+12) to eax
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d3/>>ecx 5/subop/pad-zeroes 3/mod/direct 0/rm32/eax . . . . . . # shift eax right by ecx bits, padding zeroes
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# eax = to-hex-char(AL)
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@ -221,10 +243,10 @@ $write-int32-hex:loop:
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e8/call append-byte/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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# ecx -= 4
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# bits -= 4
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81 5/subop/subtract 3/mod/direct 1/rm32/ecx . . . . . 4/imm32 # subtract from ecx
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eb/jump $write-int32-hex:loop/disp8
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$write-int32-hex:end:
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eb/jump $write-int32-hex-bits:loop/disp8
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$write-int32-hex-bits:end:
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# . restore registers
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59/pop-to-ecx
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58/pop-to-eax
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@ -264,24 +286,9 @@ test-write-int32-hex:
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c3/return
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write-int32-hex-buffered: # f: (addr buffered-file), n: int
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# pseudocode:
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# write-buffered(f, "0x")
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# ecx = 28
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# while true
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# if (ecx < 0) break
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# eax = n >> ecx
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# eax = eax & 0xf
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# write-byte-buffered(f, AL)
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# ecx -= 4
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#
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# . save registers
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50/push-eax
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51/push-ecx
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# ecx = 28
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b9/copy-to-ecx 0x1c/imm32
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$write-int32-hex-buffered:hex-prefix:
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# write-buffered(f, "0x")
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# . . push args
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@ -291,11 +298,48 @@ $write-int32-hex-buffered:hex-prefix:
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e8/call write-buffered/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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$write-int32-hex-buffered:loop:
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# if (ecx < 0) break
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$write-int32-hex-buffered:rest:
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# write-int32-hex-bits-buffered(f, n, 32)
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# . . push args
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68/push 0x20/imm32
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
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# . . call
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e8/call write-int32-hex-bits-buffered/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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$write-int32-hex-buffered:end:
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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# print rightmost 'bits' of 'n'
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# bits must be multiple of 4
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write-int32-hex-bits-buffered: # f: (addr buffered-file), n: int, bits: int
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# pseudocode:
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# bits -= 4
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# while true
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# if (bits < 0) break
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# eax = n >> bits
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# eax = eax & 0xf
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# write-byte-buffered(f, AL)
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# bits -= 4
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#
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# . save registers
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50/push-eax
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51/push-ecx
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# ecx = bits-4
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 1/r32/ecx 0x10/disp8 . # copy *(ebp+16) to ecx
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81 5/subop/subtract 3/mod/direct 1/rm32/ecx . . . . . 4/imm32 # subtract from ecx
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$write-int32-hex-bits-buffered:loop:
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# if (bits < 0) break
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81 7/subop/compare 3/mod/direct 1/rm32/ecx . . . . . 0/imm32 # compare ecx
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7c/jump-if-< $write-int32-hex-buffered:end/disp8
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# eax = n >> ecx
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7c/jump-if-< $write-int32-hex-bits-buffered:end/disp8
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# eax = n >> bits
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0xc/disp8 . # copy *(ebp+12) to eax
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d3/>>ecx 5/subop/pad-zeroes 3/mod/direct 0/rm32/eax . . . . . . # shift eax right by ecx bits, padding zeroes
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# eax = to-hex-char(AL)
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@ -309,10 +353,10 @@ $write-int32-hex-buffered:loop:
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e8/call write-byte-buffered/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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# ecx -= 4
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# bits -= 4
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81 5/subop/subtract 3/mod/direct 1/rm32/ecx . . . . . 4/imm32 # subtract from ecx
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eb/jump $write-int32-hex-buffered:loop/disp8
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$write-int32-hex-buffered:end:
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eb/jump $write-int32-hex-bits-buffered:loop/disp8
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$write-int32-hex-bits-buffered:end:
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# . restore registers
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59/pop-to-ecx
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58/pop-to-eax
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@ -236,6 +236,19 @@ $print-int32-hex-to-real-screen:end:
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5d/pop-to-ebp
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c3/return
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print-int32-hex-bits-to-real-screen: # n: int, bits: int
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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#
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(write-int32-hex-bits-buffered Stdout *(ebp+8) *(ebp+0xc) *(ebp+0x10))
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(flush Stdout)
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$print-int32-hex-bits-to-real-screen:end:
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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print-int32-decimal-to-real-screen: # n: int
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# . prologue
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55/push-ebp
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3
400.mu
3
400.mu
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@ -62,7 +62,9 @@ sig write-buffered f: (addr buffered-file), msg: (addr array byte)
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sig append-byte-hex f: (addr stream byte), n: int
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sig write-byte-hex-buffered f: (addr buffered-file), n: int
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sig write-int32-hex f: (addr stream byte), n: int
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sig write-int32-hex-bits f: (addr stream byte), n: int, bits: int
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sig write-int32-hex-buffered f: (addr buffered-file), n: int
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sig write-int32-hex-bits-buffered f: (addr buffered-file), n: int, bits: int
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sig is-hex-int? in: (addr slice) -> result/eax: boolean
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sig parse-hex-int in: (addr array byte) -> result/eax: int
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sig parse-hex-int-from-slice in: (addr slice) -> result/eax: int
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@ -152,6 +154,7 @@ sig print-slice-to-real-screen s: (addr slice)
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sig print-stream-to-real-screen s: (addr stream byte)
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sig print-grapheme-to-real-screen c: grapheme
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sig print-int32-hex-to-real-screen n: int
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sig print-int32-hex-bits-to-real-screen n: int, bits: int
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sig print-int32-decimal-to-real-screen n: int
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sig write-int32-decimal-buffered f: (addr buffered-file), n: int
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sig reset-formatting-on-real-screen
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39
405screen.mu
39
405screen.mu
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@ -435,6 +435,45 @@ $print-int32-hex:body: {
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{
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break-if-=
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# fake screen
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var s2: (stream byte 0x100)
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var s2-addr/esi: (addr stream byte) <- address s2
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write-int32-hex s2-addr, n
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var screen-addr/edi: (addr screen) <- copy screen
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{
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var done?/eax: boolean <- stream-empty? s2-addr
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compare done?, 0
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break-if-!=
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var g/eax: grapheme <- read-grapheme s2-addr
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print-grapheme screen, g
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loop
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}
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}
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}
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}
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fn print-int32-hex-bits screen: (addr screen), n: int, bits: int {
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$print-int32-hex-bits:body: {
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compare screen, 0
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{
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break-if-!=
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print-int32-hex-bits-to-real-screen n, bits
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break $print-int32-hex-bits:body
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}
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{
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break-if-=
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# fake screen
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var s2: (stream byte 0x100)
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var s2-addr/esi: (addr stream byte) <- address s2
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write-int32-hex-bits s2-addr, n, bits
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var screen-addr/edi: (addr screen) <- copy screen
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{
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var done?/eax: boolean <- stream-empty? s2-addr
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compare done?, 0
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break-if-!=
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var g/eax: grapheme <- read-grapheme s2-addr
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print-grapheme screen, g
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loop
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}
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}
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}
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}
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@ -0,0 +1,171 @@
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# quick-n-dirty way to print out floats in hex
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# examples:
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# 0.5 = 0x3f000000 = 0011| 1111 | 0000 | 0000 | 0000 | 0000 | 0000 | 0000
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# = 0 | 01111110 | 00000000000000000000000
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# + exponent mantissa
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# = 0 | 00000000000000000000000 | 01111110
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# mantissa exponent
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# = 0 | 000000000000000000000000 | 01111110
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# zero-pad mantissa exponent
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# = +1.000000 e -01
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fn test-print-float-normal {
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var screen-on-stack: screen
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var screen/esi: (addr screen) <- address screen-on-stack
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initialize-screen screen, 5, 0x20 # 32 columns should be more than enough
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# print 0.5
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var one/eax: int <- copy 1
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var half/xmm0: float <- convert one
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var two/eax: int <- copy 2
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var two-f/xmm1: float <- convert two
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half <- divide two-f
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print-float screen, half
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#
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check-screen-row screen, 1, "1.000000e-01 ", "F - test-print-float-normal"
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}
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fn test-print-float-zero {
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var screen-on-stack: screen
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var screen/esi: (addr screen) <- address screen-on-stack
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initialize-screen screen, 5, 0x20 # 32 columns should be more than enough
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# print 0
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var zero: float
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print-float screen, zero
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#
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check-screen-row screen, 1, "0 ", "F - test-print-float-zero"
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}
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fn test-print-float-negative-zero {
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var screen-on-stack: screen
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var screen/esi: (addr screen) <- address screen-on-stack
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initialize-screen screen, 5, 0x20 # 32 columns should be more than enough
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# print 0
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var n: int
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copy-to n, 0x80000000
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var negative-zero/xmm0: float <- reinterpret n
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print-float screen, negative-zero
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#
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check-screen-row screen, 1, "-0 ", "F - test-print-float-negative-zero"
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}
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fn test-print-float-infinity {
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var screen-on-stack: screen
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var screen/esi: (addr screen) <- address screen-on-stack
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initialize-screen screen, 5, 0x20 # 32 columns should be more than enough
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# print
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var n: int
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# 0|11111111|00000000000000000000000
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# 0111|1111|1000|0000|0000|0000|0000|0000
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copy-to n, 0x7f800000
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var infinity/xmm0: float <- reinterpret n
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print-float screen, infinity
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#
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check-screen-row screen, 1, "Inf ", "F - test-print-float-infinity"
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}
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fn test-print-float-negative-infinity {
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var screen-on-stack: screen
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var screen/esi: (addr screen) <- address screen-on-stack
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initialize-screen screen, 5, 0x20 # 32 columns should be more than enough
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# print
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var n: int
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copy-to n, 0xff800000
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var negative-infinity/xmm0: float <- reinterpret n
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print-float screen, negative-infinity
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#
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check-screen-row screen, 1, "-Inf ", "F - test-print-float-negative-infinity"
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}
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fn test-print-float-not-a-number {
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var screen-on-stack: screen
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var screen/esi: (addr screen) <- address screen-on-stack
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initialize-screen screen, 5, 0x20 # 32 columns should be more than enough
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# print
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var n: int
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copy-to n, 0xffffffff # exponent must be all 1's, and mantissa must be non-zero
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var negative-infinity/xmm0: float <- reinterpret n
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print-float screen, negative-infinity
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#
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check-screen-row screen, 1, "Nan ", "F - test-print-float-not-a-number"
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}
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fn print-float screen: (addr screen), n: float {
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$print-float:body: {
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# - special names
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var bits/eax: int <- reinterpret n
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compare bits, 0
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{
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break-if-!=
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print-string screen, "0"
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break $print-float:body
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}
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compare bits, 0x80000000
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{
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break-if-!=
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print-string screen, "-0"
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break $print-float:body
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}
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compare bits, 0x7f800000
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{
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break-if-!=
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print-string screen, "Inf"
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break $print-float:body
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}
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compare bits, 0xff800000
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{
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break-if-!=
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print-string screen, "-Inf"
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break $print-float:body
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}
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var exponent/ecx: int <- copy bits
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exponent <- shift-right 0x17 # 23 bits of mantissa
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exponent <- and 0xff
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compare exponent, 0xff
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{
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break-if-!=
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print-string screen, "Nan"
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break $print-float:body
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}
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# - regular numbers
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var sign/edx: int <- copy bits
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sign <- shift-right 0x1f
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{
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compare sign, 1
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break-if-!=
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print-string screen, "-"
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}
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$print-float:leading-digit: {
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# check for subnormal numbers
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compare exponent, 0
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{
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break-if-!=
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print-string screen, "0."
|
||||
exponent <- increment
|
||||
break $print-float:leading-digit
|
||||
}
|
||||
# normal numbers
|
||||
print-string screen, "1."
|
||||
}
|
||||
var mantissa/ebx: int <- copy bits
|
||||
mantissa <- and 0x7fffff
|
||||
print-int32-hex-bits screen, mantissa, 0x18
|
||||
# print exponent
|
||||
print-string screen, "e"
|
||||
exponent <- subtract 0x7f
|
||||
compare exponent, 0
|
||||
{
|
||||
break-if->=
|
||||
print-string screen, "-"
|
||||
}
|
||||
var exp-magnitude/eax: int <- abs exponent
|
||||
print-int32-hex-bits screen, exp-magnitude, 8
|
||||
}
|
||||
}
|
||||
|
||||
#? fn main -> r/ebx: int {
|
||||
#? run-tests
|
||||
#? #? test-print-float-negative-zero
|
||||
#? #? print-int32-hex 0, 0
|
||||
#? #? test-print-float-normal
|
||||
#? r <- copy 0
|
||||
#? }
|
BIN
apps/assort
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apps/assort
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apps/braces
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apps/braces
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apps/calls
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apps/calls
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apps/crenshaw2-1
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apps/crenshaw2-1
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apps/dquotes
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apps/dquotes
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apps/factorial
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apps/factorial
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apps/sigils
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apps/sigils
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apps/survey
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apps/survey
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apps/tests
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apps/tests
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Loading…
Reference in New Issue