hubert.reinterpretcast added a comment.
Has it been discussed whether this is something to be addressed in the
optimizer as opposed to the front-end?
================
Comment at: lib/CodeGen/CGExprScalar.cpp:3069
+ !isa<llvm::ConstantPointerNull>(RHS)) {
+ // Based on comparisons of pointers to dynamic objects, the optimizer
+ // can replace one pointer with another. This might result in
----------------
Consider:
```
extern "C" int printf(const char *, ...);
void *operator new(decltype(sizeof 0), void *);
struct A {
virtual void foo() { printf("%s\n", __PRETTY_FUNCTION__); }
int m;
int *zip() { return &m; }
};
struct B : A {
virtual void foo() { printf("%s\n", __PRETTY_FUNCTION__); }
};
int main(void) {
A *ap = new A;
ap->foo();
int *const apz = ap->zip();
B *bp = new (ap) B;
if (apz == bp->zip()) {
bp->foo();
}
}
```
https://reviews.llvm.org/D32378
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