71e4f38129
Baremetal is now the default build target and therefore has its sources
at the top-level. Baremetal programs build using the phase-2 Mu toolchain
that requires a Linux kernel. This phase-2 codebase which used to be at
the top-level is now under the linux/ directory. Finally, the phase-2 toolchain,
while self-hosting, has a way to bootstrap from a C implementation, which
is now stored in linux/bootstrap. The bootstrap C implementation uses some
literate programming tools that are now in linux/bootstrap/tools.
So the whole thing has gotten inverted. Each directory should build one
artifact and include the main sources (along with standard library). Tools
used for building it are relegated to sub-directories, even though those
tools are often useful in their own right, and have had lots of interesting
programs written using them.
A couple of things have gotten dropped in this process:
- I had old ways to run on just a Linux kernel, or with a Soso kernel.
No more.
- I had some old tooling for running a single test at the cursor. I haven't
used that lately. Maybe I'll bring it back one day.
The reorg isn't done yet. Still to do:
- redo documentation everywhere. All the README files, all other markdown,
particularly vocabulary.md.
- clean up how-to-run comments at the start of programs everywhere
- rethink what to do with the html/ directory. Do we even want to keep
supporting it?
In spite of these shortcomings, all the scripts at the top-level, linux/
and linux/bootstrap are working. The names of the scripts also feel reasonable.
This is a good milestone to take stock at.
197 lines
6.2 KiB
Forth
197 lines
6.2 KiB
Forth
# quick-n-dirty way to print out floats in hex
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# https://www.exploringbinary.com/hexadecimal-floating-point-constants
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# example:
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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 P -01
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fn test-print-float-hex-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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# 0.5
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var half/xmm0: float <- rational 1, 2
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print-float-hex screen, half
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check-screen-row screen, 1, "1.000000P-01 ", "F - test-print-float-hex-normal 0.5"
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# 0.25
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clear-screen screen
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var quarter/xmm0: float <- rational 1, 4
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print-float-hex screen, quarter
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check-screen-row screen, 1, "1.000000P-02 ", "F - test-print-float-hex-normal 0.25"
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# 0.75
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clear-screen screen
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var three-quarters/xmm0: float <- rational 3, 4
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print-float-hex screen, three-quarters
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check-screen-row screen, 1, "1.800000P-01 ", "F - test-print-float-hex-normal 0.75"
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# 0.1
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clear-screen screen
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var tenth/xmm0: float <- rational 1, 0xa
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print-float-hex screen, tenth
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check-screen-row screen, 1, "1.99999aP-04 ", "F - test-print-float-hex-normal 0.1"
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}
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fn test-print-float-hex-integer {
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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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# 1
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var one-f/xmm0: float <- rational 1, 1
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print-float-hex screen, one-f
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check-screen-row screen, 1, "1.000000P00 ", "F - test-print-float-hex-integer 1"
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# 2
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clear-screen screen
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var two-f/xmm0: float <- rational 2, 1
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print-float-hex screen, two-f
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check-screen-row screen, 1, "1.000000P01 ", "F - test-print-float-hex-integer 2"
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# 10
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clear-screen screen
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var ten-f/xmm0: float <- rational 0xa, 1
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print-float-hex screen, ten-f
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check-screen-row screen, 1, "1.400000P03 ", "F - test-print-float-hex-integer 10"
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# -10
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clear-screen screen
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var minus-ten-f/xmm0: float <- rational -0xa, 1
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print-float-hex screen, minus-ten-f
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check-screen-row screen, 1, "-1.400000P03 ", "F - test-print-float-hex-integer -10"
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}
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fn test-print-float-hex-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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var zero: float
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print-float-hex screen, zero
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check-screen-row screen, 1, "0 ", "F - test-print-float-hex-zero"
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}
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fn test-print-float-hex-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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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-hex screen, negative-zero
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check-screen-row screen, 1, "-0 ", "F - test-print-float-hex-negative-zero"
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}
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fn test-print-float-hex-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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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-hex screen, infinity
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check-screen-row screen, 1, "Inf ", "F - test-print-float-hex-infinity"
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}
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fn test-print-float-hex-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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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-hex screen, negative-infinity
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check-screen-row screen, 1, "-Inf ", "F - test-print-float-hex-negative-infinity"
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}
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fn test-print-float-hex-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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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-hex screen, negative-infinity
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check-screen-row screen, 1, "NaN ", "F - test-print-float-hex-not-a-number"
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}
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fn print-float-hex screen: (addr screen), n: float {
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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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return
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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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return
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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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return
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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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return
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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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exponent <- subtract 0x7f
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compare exponent, 0x80
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{
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break-if-!=
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print-string screen, "NaN"
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return
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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-hex:leading-digit: {
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# check for subnormal numbers
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compare exponent, -0x7f
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{
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break-if-!=
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print-string screen, "0."
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exponent <- increment
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break $print-float-hex:leading-digit
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}
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# normal numbers
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print-string screen, "1."
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}
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var mantissa/ebx: int <- copy bits
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mantissa <- and 0x7fffff
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mantissa <- shift-left 1 # pad to whole nibbles
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print-int32-hex-bits screen, mantissa, 0x18
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# print exponent
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print-string screen, "P"
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compare exponent, 0
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{
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break-if->=
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print-string screen, "-"
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}
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var exp-magnitude/eax: int <- abs exponent
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print-int32-hex-bits screen, exp-magnitude, 8
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}
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#? fn main -> _/ebx: int {
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#? run-tests
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#? #? test-print-float-hex-negative-zero
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#? #? print-int32-hex 0, 0
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#? #? test-print-float-hex-normal
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#? return 0
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#? }
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