| Issue |
167014
|
| Summary |
Missed Optimization: Fold chained GEP with constant base into single GEP
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Leo0506
|
```
define ptr @src(i32 %arg0, ptr %arg1) {
%v0 = getelementptr inbounds nuw i8, ptr %arg1, i64 8148
%v1 = icmp sgt i32 %arg0, 3
%v2 = select i1 %v1, i64 55104, i64 21304
%v3 = getelementptr i8, ptr %v0, i64 %v2
ret ptr %v3
}
define ptr @tgt(i32 %arg0, ptr %arg1) {
%v1 = icmp sgt i32 %arg0, 3
%v2 = select i1 %v1, i64 63252, i64 29452
%v3 = getelementptr i8, ptr %arg1, i64 %v2
ret ptr %v3
}
```
alive2: https://alive2.llvm.org/ce/z/YvBj6A
godbolt: https://godbolt.org/z/hYW8Mvefj
Pattern found in: https://github.com/dtcxzyw/llvm-opt-benchmark/blob/main/bench/ffmpeg/optimized/msmpeg4enc.ll
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