https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95097
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks|85316 |
Severity|normal |enhancement
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The problem is if (f.x) gets lowered too early.
This is not directly a VPR issue either.
Changing the code slightly:
#include <stdint.h>
struct foo {
uint32_t x:20;
};
int bar(struct foo f)
{
uint32_t y = (uint32_t)f.x;
if (y) {
y *= 4096;
if (y<200) return 1;
else return 2;
}
return 3;
}
GCC is able to optimize it.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85316
[Bug 85316] [meta-bug] VRP range propagation missed cases
