| Issue |
157486
|
| Summary |
Missed Optimization: Convert float clamp pattern to llvm.minnum/llvm.maxnum
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Leo0506
|
```
define float @src(float %arg0) {
%v0 = fcmp nsz ogt float %arg0, 0.000000e+00
%v1 = select nsz i1 %v0, float %arg0, float 0.000000e+00
%v2 = fcmp nsz ogt float %v1, 0x3FE96C8000000000
%v3 = select nsz i1 %v2, float 0x3FE96C8000000000, float %v1
ret float %v3
}
define float @tgt(float %arg0) {
%v0 = call float @llvm.maxnum.f32(float %arg0, float 0.000000e+00)
%v1 = call float @llvm.minnum.f32(float %v0, float 0x3FE96C8000000000)
ret float %v1
}
```
godbolt: https://godbolt.org/z/f8h4e9rhd
alive2: https://alive2.llvm.org/ce/z/gRp79d
Pattern found in: https://github.com/dtcxzyw/llvm-opt-benchmark/blob/main/bench/ffmpeg/optimized/amrnbdec.ll
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