[Bug tree-optimization/64601] Missed PRE on std::vector move assignment

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64601

--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
Actually there is no need for inlining.

struct A { int i; };
void f(struct A *a){ *&a->i=0; }
void g(struct A *a){ int*p=&a->i;*p=0; }

The main difference seems to be that the first one gets through fold-const.c
while the second is handled by tree-ssa-forwprop.c.