https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103431
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Component|rtl-optimization |middle-end
Last reconfirmed| |2021-11-25
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
reduced testcase (removing the globals):
typedef unsigned __int128 B;
__attribute__((noipa))
void f(unsigned short a)
{
B b = 5;
int size = (sizeof(b)*8)-1;
a /= 0xfffffffd;
B b1 = (b << (a & size) | b >> (-(a & size) & size));
if (b1 != 5)
__builtin_abort ();
}
int
main (void)
{
f(0);
}
----- CUT ---
The gimple level does not change. In GCC 11 and the trunk, we have:
_1 = (unsigned intD.9) a_8(D);
_2 = _1 / 4294967293;
a_9 = (short unsigned intD.18) _2;
_13 = a_9 & 127;
_3 = (intD.6) _13;
b1_10 = 5 r<< _3;
if (b1_10 != 5)
It looks like the expansion from gimple to RTL of the rotate is different
between the two versions.
