https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97445

--- Comment #44 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Then perhaps some backends need to be improved.
Try e.g.:
void bar (void);

void
foo (int x)
{
  if (__builtin_clz (x) == 32)
    bar ();
}
with trunk GCC if you don't trust me.

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