[Bug tree-optimization/37574] New: [4.4 Regression] ICE with the vectorizer and GC

[pinskia at gcc dot gnu dot org]

I noticed this while working on a rs6000 back-end patch and was questioning how
I could have caused this failure and then I noticed it was a GC issue and could
be reproduced without my patch.
Anyways here is the testcase reduced from vect-outer-4m.c:
unsigned short in[40 +128];
int main (void) {
  int i = 0, j = 0;
  unsigned int diff;
  unsigned int s=0,sum=0;
  for (i = 0; i < 40;i++)
  {
     diff = 0;
     for (j = 0; j < 128;j+=8) 
       diff += in[j+i];
     s += ((unsigned short)diff>>3);
   }
   if (s != sum)
     abort ();
 }
--- CUT ---
Compile with -O2 -ftree-vectorize  --param ggc-min-expand=0 --param
ggc-min-heapsize=0 -maltivec to reproduce the bug.


-- 
           Summary: [4.4 Regression] ICE with the vectorizer and GC
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code, GC
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
GCC target triplet: powerpc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37574