https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107053
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note the correct testcase is:
void link_failure();
void f(int a)
{
a |= 0x300;
int b = __builtin_popcount(a);
if (b < 2)
link_failure();
}
--- CUT ---
the range of b should be 2..31 (assuming int is 32bits).
With this change clang is able to optimize it.
For the original testcase I think it can be folded to:
void link_failure();
void f(int a)
{
int a1 &= ~0x300;
if (a1 != 0)
link_failure();
}
but that might be worse unless popcount can be removed. (If I did this
correctly).
