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From: "mgretton at sourceware dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/50576] New: Recent vector comparison changes cause an ICE
Date: Fri, 30 Sep 2011 10:56:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50576

             Bug #: 50576
           Summary: Recent vector comparison changes cause an ICE
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mgretton@sourceware.org
                CC: artyom.shinkaroff@gmail.com,
                    richard.guenther@gmail.com
              Host: x86_64-linux-gnu
            Target: arm-none-eabi


Compiling the following (cut down from the
gcc.c-torture/execute/vector-compare-1.c test case):

/* try.c.  */
int
main (int argc, char *argv[])
{
  __attribute__ ((vector_size ((2) * sizeof (double)))) double d0;
  __attribute__ ((vector_size ((2) * sizeof (double)))) double d1;
  __attribute__ ((vector_size ((2) * sizeof (long long)))) long long idres;
    {
      idres = (d0 > d1);
    }
}
/* end of try.c.  */

with:

arm-none-eabi-gcc -mfpu=neon -mfloat-abi=softfp -mcpu=cortex-a9 -c try.c

Gives:

try.c: In function 'main':
try.c:3:1: error: invalid vector comparison resulting type
vector(2) long long int
idres = d0 > d1;

try.c:3:1: internal compiler error: verify_gimple failed

This was tested with trunk r179378.  

The issue was introduced by this patch
(http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01088.html - checked in as
r179342), and has not been fixed by Richard Guenther's follow on patch
(http://gcc.gnu.org/ml/gcc-patches/2011-09/msg01933.html).