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[AMDGPU] Fix error in #88512. #92770

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Merged
PeddleSpam merged 3 commits into from
May 20, 2024
Merged

[AMDGPU] Fix error in #88512. #92770

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6daf86e
[AMDGPU] Fix error in #88512.
May 20, 2024
ed1ef23
Update tests.
May 20, 2024
a06d15c
Address review comments.
May 20, 2024
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2 changes: 1 addition & 1 deletion llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4168,7 +4168,7 @@ bool AMDGPULegalizerInfo::legalizeCTLZ_ZERO_UNDEF(MachineInstr &MI,

auto ShiftAmt = B.buildConstant(S32, 32u - NumBits);
auto Extend = B.buildAnyExt(S32, {Src}).getReg(0u);
auto Shift = B.buildLShr(S32, {Extend}, ShiftAmt);
auto Shift = B.buildShl(S32, {Extend}, ShiftAmt);
auto Ctlz = B.buildInstr(AMDGPU::G_AMDGPU_FFBH_U32, {S32}, {Shift});
B.buildTrunc(Dst, Ctlz);
MI.eraseFromParent();
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