[Bug target/49069] [4.6/4.7/4.8 Regression] ICE in gen_cstoredi4, at config/arm/arm.md:7554

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49069

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |nickc at gcc dot gnu.org,
                   |                            |ramana at gcc dot gnu.org

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-01-17 15:55:26 UTC ---
The issue isn't latent, can be still reproduced with:
/* PR target/49069 */
/* { dg-do compile } */
/* { dg-options "-Os -fno-tree-forwprop -Wno-div-by-zero" } */

int a;
const unsigned long long b[1] = { 1ULL };
extern void bar (int);

void
foo (void)
{
  for (a = 0; a == 1; a = 2)
    ;
  bar (b[0] == (a == 0 ? a : a / 0));
}

Which also shows that the middle-end usually optimizes that well (cf. #c4), but
the arm backend relying on that always happening is just a very bad assumption.