https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84562
Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |amonakov at gcc dot gnu.org
--- Comment #3 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
It's not just -faggressive-loop-optimizations, it seems that constructors of
weak globals are available for folding, and I really doubt that's actually
intended; after all, GCC does always consider weak function interposable, so
why not objects? Compare:
__attribute__((weak)) const int x=0; int f(){return x==0;}
f:
movl $1, %eax
ret
vs.
__attribute__((weak)) int x(void){return 0;} int f(){return x()==0;}
f:
subq $8, %rsp
call x
testl %eax, %eax
sete %al
movzbl %al, %eax
popq %rdx
ret
