gcc/testsuite/gcc.dg/tree-ssa/loop-36.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-dce3" } */
   3
   4 struct X { float array[2]; };
   5
   6 struct X a,b;
   7
   8 float foobar () {
   9   float s = 0;
  10   unsigned int d;
  11   struct X c;
  12   for (d=0; d<2; ++d)
  13     c.array[d] = a.array[d] * b.array[d];
  14   for (d=0; d<2; ++d)
  15     s+=c.array[d];
  16   return s;
  17 }
  18
  19 /* The temporary structure should have been promoted to registers
  20    by FRE after the loops have been unrolled by the early unrolling pass.  */
  21 /* { dg-final { scan-tree-dump-not "c\.array" "dce3" } } */