https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94293
--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
Adding
inline void* operator new(std::size_t n){return __builtin_malloc(n);}
inline void operator delete(void*p)noexcept{__builtin_free(p);}
inline void operator delete(void*p,std::size_t)noexcept{__builtin_free(p);}
lets gcc optimize. Without it, we end up with
_37 = operator new (51);
__builtin_memcpy (_37, "Hey... no small-string optimization for me please!",
50);
MEM[(char_type &)_37 + 50] = 0;
operator delete (_37, 51);
return 123;
I expect DSE (via tree-ssa-alias.c) doesn't know about delete the way it knows
about free and thus doesn't see the stores as dead.
