diff options
Diffstat (limited to 'llvm/lib/Target/AMDGPU/AMDGPUInstructions.td')
| -rw-r--r-- | llvm/lib/Target/AMDGPU/AMDGPUInstructions.td | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstructions.td b/llvm/lib/Target/AMDGPU/AMDGPUInstructions.td index 4d7da21a591..22a7a9c44a3 100644 --- a/llvm/lib/Target/AMDGPU/AMDGPUInstructions.td +++ b/llvm/lib/Target/AMDGPU/AMDGPUInstructions.td @@ -682,6 +682,13 @@ multiclass BFEPattern <Instruction UBFE, Instruction SBFE, Instruction MOV> { (UBFE $src, $rshift, (MOV (i32 (IMMPopCount $mask)))) >; + // x & (-1 >> (bitwidth - y)) + def : AMDGPUPat < + (and i32:$src, (srl_oneuse -1, (sub 32, i32:$width))), + (UBFE $src, (i32 0), $width) + >; + + // x << (bitwidth - y) >> (bitwidth - y) def : AMDGPUPat < (srl (shl_oneuse i32:$src, (sub 32, i32:$width)), (sub 32, i32:$width)), (UBFE $src, (i32 0), $width) |
