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| author | Michael Liao <michael.hliao@gmail.com> | 2019-11-01 15:49:41 -0400 |
|---|---|---|
| committer | Michael Liao <michael.hliao@gmail.com> | 2019-11-01 17:06:17 -0400 |
| commit | 4531aee2ac1609e8ddf4f3deec200c5f793faa7b (patch) | |
| tree | 20b6e2ef9aec2437c6f1c6d65079279e970e5b52 /llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp | |
| parent | 16ec00eee7e348767f4393f189044f87f6374031 (diff) | |
| download | bcm5719-llvm-4531aee2ac1609e8ddf4f3deec200c5f793faa7b.tar.gz bcm5719-llvm-4531aee2ac1609e8ddf4f3deec200c5f793faa7b.zip | |
[amdgpu] Fix known bits compuation on `MUL_I24`/`MUL_U24`.
Reviewers: arsenm, rampitec
Subscribers: kzhuravl, jvesely, wdng, nhaehnle, dstuttard, tpr, t-tye, hiraditya, llvm-commits, yaxunl
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D69735
Diffstat (limited to 'llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp b/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp index 1115d8c2362..8912ef44603 100644 --- a/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp +++ b/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp @@ -4435,6 +4435,9 @@ void AMDGPUTargetLowering::computeKnownBitsForTargetNode( unsigned TrailZ = LHSKnown.countMinTrailingZeros() + RHSKnown.countMinTrailingZeros(); Known.Zero.setLowBits(std::min(TrailZ, 32u)); + // Skip extra check if all bits are known zeros. + if (TrailZ >= 32) + break; // Truncate to 24 bits. LHSKnown = LHSKnown.trunc(24); |
