| Issue |
91481
|
| Summary |
miscompile due to interaction between returned and range attributes
|
| Labels |
miscompilation
|
| Assignees |
|
| Reporter |
regehr
|
this function:
```llvm
define i32 @f(i32 %0) {
%2 = shl i32 %0, 1
%3 = sub nuw i32 %2, %0
ret i32 %3
}
```
is being optimized to:
```lllvm
define range(i32 0, -1) i32 @f(i32 returned %0) local_unnamed_addr #0 {
ret i32 %0
}
attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(none) }
```
but when we pass -1 to the optimized code this is out-of-bounds for the range, creating poison, violating the rules for `returned`
cc @nunoplopes
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