| Issue |
125469
|
| Summary |
Missed optimization: fold zext nneg + GEP into direct GEP with the nneg index
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Cancelll
|
Example: https://godbolt.org/z/fh7WM5fKv
Alive2: https://alive2.llvm.org/ce/z/ChnMWA
```llvm
define ptr @src(ptr %2, i32 %idx) {
%idx.ext = zext nneg i32 %idx to i64
%add.ptr = getelementptr inbounds nuw i16, ptr %2, i64 %idx.ext
ret ptr %add.ptr
}
define ptr @tgt(ptr %2, i32 %idx) {
%add.ptr = getelementptr inbounds nuw i16, ptr %2, i32 %idx
ret ptr %add.ptr
}
```
I found this pattern in function `SSL_get_sigalgs` in `openssl/ssl/t1_lib.c`
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