| Issue |
167094
|
| Summary |
Missed Optimization: Fold fcmp+select clamp to [-32000, 32000] into maxnum/ minnum pair
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Leo0506
|
```
define float @src(float %arg0) {
%v0 = fcmp nsz ogt float %arg0, -3.200000e+04
%v1 = select nsz i1 %v0, float %arg0, float -3.200000e+04
%v2 = fcmp nsz ogt float %v1, 3.200000e+04
%v3 = select nsz i1 %v2, float 3.200000e+04, float %v1
ret float %v3
}
define float @tgt(float %arg0) {
%v1 = call float @llvm.maxnum.f32(float %arg0, float -3.200000e+04)
%v3 = call float @llvm.minnum.f32(float %v1, float 3.200000e+04)
ret float %v3
}
```
alive2: https://alive2.llvm.org/ce/z/FYdXs-
godbolt: https://godbolt.org/z/38roe3MhK
Pattern found in: https://github.com/dtcxzyw/llvm-opt-benchmark/blob/main/bench/ffmpeg/optimized/speexdec.ll
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