[Bug tree-optimization/56034] New: ICE: verify_gimple failed (invalid PHI argument) with -ftree-loop-distribution

["antoine.balestrat at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56034

             Bug #: 56034
           Summary: ICE: verify_gimple failed (invalid PHI argument) with
                    -ftree-loop-distribution
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: antoine.balestrat@gmail.com


Hi !
Using GCC 4.8.0 as of 20130118 :

$ cat incompat.c
int a, b, *p;

void f(void)
{
    int *q;

    while(b++)
    {
        int i;
        p = &i;
        a = *q;
    }

    if(a)
        for(;; b++);
}

$ xgcc -O2 -w -ftree-loop-distribution incompat.c
incompat.c: In function âfâ:
incompat.c:3:6: error: invalid PHI argument
 void f(void)
      ^
.MEM_10
incompat.c:3:6: error: incompatible types in PHI argument 0
int

void

a.0_26 = PHI <.MEM_10(5)>

incompat.c:3:6: internal compiler error: verify_gimple failed
0x90380c verify_gimple_in_cfg(function*)
    ../../srcdir/gcc/tree-cfg.c:4727
0x83e917 execute_function_todo
    ../../srcdir/gcc/passes.c:1966
0x83f297 execute_todo
    ../../srcdir/gcc/passes.c:1999
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