llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT--> @llvm/pr-subscribers-backend-amdgpu Author: Matt Arsenault (arsenm) <details> <summary>Changes</summary> --- Full diff: https://github.com/llvm/llvm-project/pull/131062.diff 2 Files Affected: - (modified) llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp (+5) - (modified) llvm/test/Transforms/InstCombine/AMDGPU/fmul_legacy.ll (+16) ``````````diff diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp b/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp index 083fa2a730fff..ba4e6e530fe56 100644 --- a/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp +++ b/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp @@ -1255,6 +1255,11 @@ GCNTTIImpl::instCombineIntrinsic(InstCombiner &IC, IntrinsicInst &II) const { Value *Op0 = II.getArgOperand(0); Value *Op1 = II.getArgOperand(1); + for (Value *Src : {Op0, Op1}) { + if (isa<PoisonValue>(Src)) + return IC.replaceInstUsesWith(II, Src); + } + // The legacy behaviour is that multiplying +/-0.0 by anything, even NaN or // infinity, gives +0.0. // TODO: Move to InstSimplify? diff --git a/llvm/test/Transforms/InstCombine/AMDGPU/fmul_legacy.ll b/llvm/test/Transforms/InstCombine/AMDGPU/fmul_legacy.ll index d58470d6b12ad..899b611b929d1 100644 --- a/llvm/test/Transforms/InstCombine/AMDGPU/fmul_legacy.ll +++ b/llvm/test/Transforms/InstCombine/AMDGPU/fmul_legacy.ll @@ -75,6 +75,22 @@ define float @test_finite_assumed(float %x, float %y) { ret float %call } +define float @test_poison_var(float %x) { +; CHECK-LABEL: @test_poison_var( +; CHECK-NEXT: ret float poison +; + %call = call float @llvm.amdgcn.fmul.legacy(float poison, float %x) + ret float %call +} + +define float @test_var_poison(float %x) { +; CHECK-LABEL: @test_var_poison( +; CHECK-NEXT: ret float poison +; + %call = call float @llvm.amdgcn.fmul.legacy(float %x, float poison) + ret float %call +} + declare float @llvm.amdgcn.fmul.legacy(float, float) declare float @llvm.fabs.f32(float) declare void @llvm.assume(i1 noundef) `````````` </details> https://github.com/llvm/llvm-project/pull/131062 _______________________________________________ llvm-branch-commits mailing list llvm-branch-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-branch-commits
