[regehr@gamow tmp405]$ current-gcc -c -O2 small.c
small.c: In function 'int32func':
small.c:26:1: error: definition in block 8 follows the use
for SSA_NAME: g_313.0_6 in statement:
# VUSE <.MEM_22>
g_313.8_12 = *g_313.0_6;
small.c:26:1: 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 tmp405]$ cat small.c

typedef int int32_t;
typedef unsigned char uint8_t;

struct S0
{
  uint8_t f3;
};

struct S2
{
  uint8_t f5;
};

struct S0 g_22 = {
  0
};

int32_t g_91;
const struct S2 *g_314;
const struct S2 **g_313 = &g_314;
struct S2 g_320[2] = {
  0
};

void
int32func (uint64p_34)
{
  for (g_22.f3 = 0; g_22.f3 <= 0; g_22.f3)
    {
    lbl_491:{
	if (1)
	  {
	    int32_t *l_453[2][7][7][1][1];
	    int i, j, k, l, m;
	    for (m; m; m++)
	      l_453[i][j][k][l][m];
	  }
	*g_313 = 0;
	if (g_91)
	  goto lbl_491;
      }
    }
}

[regehr@gamow tmp405]$ current-gcc -v

Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r158448-install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --with-libelf=/usr/local --enable-lto --prefix=/home/regehr/z/compiler-install/gcc-r158448-install --program-prefix=r158448- --enable-languages=c,c++
Thread model: posix
gcc version 4.6.0 20100416 (experimental) (GCC)