[Bug c/52255] New: ICE: verify_ssa failed, block does not dominate use

[regehr at cs dot utah.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52255

             Bug #: 52255
           Summary: ICE: verify_ssa failed, block does not dominate use
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: reg...@cs.utah.edu
                CC: cheny...@cs.utah.edu


[regehr@gamow 1]$ current-gcc -Ofast small.c

small.c: In function 'f':
small.c:3:6: error: definition in block 8 does not dominate use in block 9
for SSA_NAME: .MEM_22 in statement:
# .MEM_29 = VDEF <.MEM_22>
c[0] = c_I_lsm.9_32;
small.c:3:6: internal compiler error: verify_ssa failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

[regehr@gamow 1]$ cat small.c

int a, b, c[10], d[10] = { 0, 0 };

void f (void) {
  for (a = 1; a <= 4; a += 1)
    d[a] = d[1];
  for (; b; ++b)
    c[0] |= 1;
}

[regehr@gamow 1]$ current-gcc -v

Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r184237-install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --with-libelf=/usr/local --enable-lto
--prefix=/home/regehr/z/compiler-install/gcc-r184237-install
--program-prefix=r184237- --enable-languages=c,c++
Thread model: posix
gcc version 4.7.0 20120214 (experimental) (GCC)