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Remove unsafe bool casts #111024

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Merged
merged 4 commits into from
Jan 28, 2025
Merged

Remove unsafe bool casts #111024

merged 4 commits into from
Jan 28, 2025

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xtqqczze
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@xtqqczze xtqqczze commented Jan 2, 2025 •
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Contributes to #94941.

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xtqqczze commented Jan 2, 2025

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xtqqczze
xtqqczze commented Jan 2, 2025
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xtqqczze commented Jan 2, 2025 •
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@tannergooding Is this beneficial? 2 bytes higher in code size, but 0.75 lower PerfScore.

MihuBot/runtime-utils#854

 ; Assembly listing for method System.Half:op_Explicit(float):System.Half (FullOpts)
+       xor      ecx, ecx
+       mov      edx, -1
        vucomiss xmm0, xmm0
-       setp     cl
-       movzx    rcx, cl
-       dec      ecx
+       cmovnp   ecx, edx

Related: #61761 (comment)

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LGTM otherwise, thanks!. Wonder if we have more such bool <--> int unsafe conversions

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xtqqczze commented Jan 3, 2025 •
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LGTM otherwise, thanks!. Wonder if we have more such bool <--> int unsafe conversions

These were the only conversions I found searching for:

  • Unsafe.As<bool
  • Unsafe.BitCast<bool
  • *(byte*)&
  • *(sbyte*)&

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EgorBo commented Jan 10, 2025

Is this ready?

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xtqqczze commented Jan 10, 2025 •
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Is this ready?

@EgorBo I had a question about codegen: #111024 (comment)

I'm guessing the diff codegen in that comment is preferable?

@xtqqczze xtqqczze marked this pull request as ready for review January 11, 2025 00:32
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@EgorBo EgorBo merged commit 21ab780 into dotnet:main Jan 28, 2025
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EgorBo commented Jan 28, 2025

Thanks!

grendello added a commit to grendello/runtime that referenced this pull request Jan 30, 2025
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Merge branch 'main' into dev/grendel/android-clr-host-local
3ff6056 
* main:
  Make cdac APIs public but experimental (dotnet#111180)
  JIT: Enable inlining for late devirtualization (dotnet#110827)
  Remove unsafe `bool` casts (dotnet#111024)
  Fix shimmed implementation of TryGetHashAndReset to handle HMAC.
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