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[AMDGPU] Reland "Remove redundant s_cmp_lg_* sX, 0" #164201

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Merged
merged 8 commits into from
Oct 22, 2025
Merged

[AMDGPU] Reland "Remove redundant s_cmp_lg_* sX, 0" #164201

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1439b49
Revert "Revert "[AMDGPU] Remove redundant s_cmp_lg_* sX, 0 " (#164116)"
LU-JOHN Oct 19, 2025
5c801f6
SI_PC_ADD_REL_OFFSET does not set SCC = DST!=0
LU-JOHN Oct 20, 2025
706ec85
List suitable opcodes. Negative test for si_pc_add_rel_offset.
LU-JOHN Oct 20, 2025
5c787c0
Remove unused parameter
LU-JOHN Oct 20, 2025
f18fabf
Streamline check for foldable Def
LU-JOHN Oct 21, 2025
8c036ef
Add S_WQM*. Sort opcodes.
LU-JOHN Oct 21, 2025
3518318
Use weak linkage
LU-JOHN Oct 21, 2025
96e16d4
Update llvm/test/CodeGen/AMDGPU/s_cmp_0.ll
LU-JOHN Oct 22, 2025
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1 change: 1 addition & 0 deletions llvm/lib/Target/AMDGPU/SIInstrInfo.h
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Original file line number Diff line number Diff line change
Expand Up @@ -729,6 +729,7 @@ class SIInstrInfo final : public AMDGPUGenInstrInfo {
case AMDGPU::S_MAX_I32:
case AMDGPU::S_MAX_U32:
case AMDGPU::S_ADDK_I32:
case AMDGPU::SI_PC_ADD_REL_OFFSET:
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@arsenm arsenm Oct 20, 2025

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Should have new test that covers the regression

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@arsenm arsenm Oct 20, 2025

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Also it would be better to invert the logic, The default should not be to assume this is foldable

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@LU-JOHN LU-JOHN Oct 20, 2025

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Added new test and inverted logic.

return false;
}
}
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