| Issue |
130958
|
| Summary |
[Clang] Missed case of TBAA with different derived classes with a common base class
|
| Labels |
clang:codegen,
missed-optimization,
TBAA
|
| Assignees |
|
| Reporter |
frederick-vs-ja
|
When compiling this example with `-O3`, Clang currently performs one more indirection than GCC. [Godbolt link](https://godbolt.org/z/hKd7561os)
```C++
struct Base {
int x;
};
struct D1 : Base {};
struct D2 : Base {
Base y;
};
int foo2(D1& d1, D2& d2) {
d1.x = 1;
d2.x = 2;
return d1.x;
}
```
It seems that Clang's TBAA can be improved for such cases.
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