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Combine cast => negate => compare on ARM64 #112944

Merged
merged 1 commit into from
Feb 28, 2025
Merged

Combine cast => negate => compare on ARM64 #112944

merged 1 commit into from
Feb 28, 2025

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snickolls-arm
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For example a == -(sbyte)b,

sxtb w0, w0
neg w0, w0
cmp w1, w0

becomes

cmn w1, w0, SXTB

Contributes towards #68028

@snickolls-arm
Combine cast => negate => compare on ARM64
2768bec 
For example `a == -(sbyte)b`,
```
sxtb w0, w0
neg w0, w0
cmp w1, w0
```
becomes
```
cmn w1, w0, SXTB
```

Contributes towards dotnet#68028
@dotnet-issue-labeler dotnet-issue-labeler bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Feb 26, 2025
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

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@a74nh @kunalspathak

This was referenced Feb 26, 2025
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kunalspathak approved these changes Feb 28, 2025
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LGTM. Interestingly, there are no asmdiffs so seems this pattern is uncommon.

@kunalspathak kunalspathak merged commit e575397 into dotnet:main Feb 28, 2025
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@kunalspathak kunalspathak mentioned this pull request Mar 3, 2025
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@EgorBo EgorBo mentioned this pull request Mar 6, 2025
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@jakobbotsch jakobbotsch mentioned this pull request Mar 10, 2025
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