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| author | Roman Lebedev <lebedev.ri@gmail.com> | 2018-06-15 09:56:45 +0000 |
|---|---|---|
| committer | Roman Lebedev <lebedev.ri@gmail.com> | 2018-06-15 09:56:45 +0000 |
| commit | dec562c84956d4816b168b1a7bfe7b2703eaaf86 (patch) | |
| tree | 0085df3544d7f4509e28d785cc25f8c86c6ba271 /llvm/lib/Target/AMDGPU | |
| parent | 9c17dad8f2528ebb9505ab2e549cc25d307d0f2b (diff) | |
| download | bcm5719-llvm-dec562c84956d4816b168b1a7bfe7b2703eaaf86.tar.gz bcm5719-llvm-dec562c84956d4816b168b1a7bfe7b2703eaaf86.zip | |
[AMDGPU] Recognize x & ~(-1 << y) pattern.
Summary: The same pattern as D48010, but this one is IR-canonical as of D47428.
Reviewers: nhaehnle, bogner, tstellar, arsenm
Reviewed By: arsenm
Subscribers: arsenm, kzhuravl, wdng, yaxunl, dstuttard, tpr, t-tye, llvm-commits
Tags: #amdgpu
Differential Revision: https://reviews.llvm.org/D48012
llvm-svn: 334817
Diffstat (limited to 'llvm/lib/Target/AMDGPU')
| -rw-r--r-- | llvm/lib/Target/AMDGPU/AMDGPUInstructions.td | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstructions.td b/llvm/lib/Target/AMDGPU/AMDGPUInstructions.td index 65d72fcb46f..d7acb6bf12d 100644 --- a/llvm/lib/Target/AMDGPU/AMDGPUInstructions.td +++ b/llvm/lib/Target/AMDGPU/AMDGPUInstructions.td @@ -689,6 +689,12 @@ multiclass BFEPattern <Instruction UBFE, Instruction SBFE, Instruction MOV> { (UBFE $src, (i32 0), $width) >; + // x & ~(-1 << y) + def : AMDGPUPat < + (and i32:$src, (xor_oneuse (shl_oneuse -1, i32:$width), -1)), + (UBFE $src, (i32 0), $width) + >; + // x & (-1 >> (bitwidth - y)) def : AMDGPUPat < (and i32:$src, (srl_oneuse -1, (sub 32, i32:$width))), |
