nikic wrote:
Reverted this due to ubsan errors like:
> /home/b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/include/llvm/IR/ValueHandle.h:286:64:
> runtime error: upcast of misaligned address 0xffffffffffffffff for type
> 'llvm::BasicBlock', which requires 8 byte alignment
The problem is basically code like this:
```
class Foo {
unsigned x;
};
class Bar : public Foo {};
Bar *test(Foo *ptr) {
return static_cast<Bar *>(reinterpret_cast<Foo *>(-1));
}
```
Where ubsan doesn't like the static_cast.
While DenseMap itself doesn't need the aligned pointers, it seems like too many
other places end up depending on this.
https://github.com/llvm/llvm-project/pull/146595
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