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Subject: [Bug tree-optimization/55281] [4.8 Regression] ICE in  build_int_cst_wide, at tree.c:1217  (with Ofast, ok with O3)
Date: Mon, 12 Nov 2012 10:33:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55281

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2012-11-12
                 CC|                            |jakub at gcc dot gnu.org
         AssignedTo|unassigned at gcc dot       |jakub at gcc dot gnu.org
                   |gnu.org                     |
   Target Milestone|---                         |4.8.0
     Ever Confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-11-12 10:33:27 UTC ---
Short testcase:

typedef float VF __attribute__((vector_size (16)));

VF x;

void
foo (void)
{
  VF a, b, c;
  a = (VF) { 1.0, 2.0, 3.0, 4.0 };
  b = (VF) { 5.0, 6.0, 7.0, 8.0 };
  c = (VF) { 0.0, 0.0, 0.0, 0.0 };
  x = c != ((VF) { 0.0, 0.0, 0.0, 0.0 }) ? a : b;
}

with -Ofast.  I was surprised only C++ handles this and not C BTW.