https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113676
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |aldyh at gcc dot gnu.org,
| |amacleod at redhat dot com,
| |jakub at gcc dot gnu.org
Keywords|needs-bisection |
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Bisection with -O2 -ftree-vrp
#include <vector>
unsigned
bit_ceil (unsigned x)
{
if (x <= 1)
return 1U;
int w = 32 - __builtin_clz (x - 1);
return 1U << w;
}
int
main (int argc, char **)
{
unsigned rounded_n = bit_ceil ((unsigned) (argc + 1));
auto a = std::vector<int> (2UL * rounded_n);
for (long unsigned int i = rounded_n; i-- > 1;)
{
if (!(0 < i && i < rounded_n))
__builtin_unreachable();
a[i] = 0;
}
}
shows this started with r12-155-gd8e1f1d24179690fd9c0f63c27b12e030010d9ea
and went away with r13-3596-ge7310e24b1c0ca67b1bb507c1330b2bf39e59e32
so nothing really backportable.
