https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85683
Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-07
CC| |amonakov at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Smaller testcase:
void f(void);
void g(int *p)
{
if (!--*p)
f();
}
On gcc-7.3 this is optimized by the peephole2 pass so it doesn't really help
with register pressure (combine pass seems more suitable for that); don't know
why the peephole doesn't trigger on gcc-8.
