On 2016-06-08 10:29, Richard Biener wrote:
On Wed, Jun 8, 2016 at 8:36 AM, Alexander Cherepanov <ch3r...@openwall.com> wrote:
[skip]
But my question is about the following example:---------------------------------------------------------------------- #include <stdio.h> int main() { _Bool b; *(char *)&b = 123; printf("%d\n", *(char *)&b); } ---------------------------------------------------------------------- Results: ---------------------------------------------------------------------- $ gcc -std=c11 -pedantic -Wall -Wextra test.c && ./a.out 123 $ gcc -std=c11 -pedantic -Wall -Wextra -O3 test.c && ./a.out 1 ----------------------------------------------------------------------
[skip]
Another explanation is that this is a bug. It manifests itself at the time we re-write 'b' into SSA form, disregarding the fact that we access it via a type that while matching in size does not match in precision.
Oh, that's much more boring outcome:-)
Can you open a bugreport?
Sure, https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71452 . -- Alexander Cherepanov
