https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98977
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2021-12-23
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Depends on| |3507
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, PR 3507 is part of it (maybe all of it) as shown by:
#include <stdbool.h>
#include <stdint.h>
extern bool z, c;
uint8_t f(uint8_t dest, uint8_t src)
{
uint8_t res = dest - src;
//z = !res;
c = src > dest;
return res;
}
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3507
[Bug 3507] appalling optimisation with sub/cmp on multiple targets
