gcc/testsuite/gcc.dg/tree-ssa/ldist-11.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -ftree-loop-distribution -ftree-loop-distribute-patterns -fdump-tree-ldist-all" } */
   3
   4 void foo (int * __restrict__ ia,
   5           int * __restrict__ ib,
   6           int * __restrict__ oxa,
   7           int * __restrict__ oxb,
   8           int * __restrict__ oya,
   9           int * __restrict__ oyb)
  10 {
  11   int i;
  12   long int mya[52];
  13   long int myb[52];
  14
  15   for (i=0; i < 52; i++)
  16     {
  17       mya[i] = ia[i] * oxa[i] + ib[i] * oxb[i];
  18       myb[i] = -ia[i] * oxb[i] + ib[i] * oxa[i];
  19       oya[i] = 0;
  20       oyb[i] = myb[i] >> 10;
  21     }
  22
  23   /* This loop should be distributed, and the result should look like
  24      this:
  25      |  memset (oya, 0, 208);
  26      |  for (i=0; i < 52; i++)
  27      |    oyb[i] = -ia[i] * oxb[i] + ib[i] * oxa[i] >> 10;
  28   */
  29 }
  30
  31 /* { dg-final { scan-tree-dump-times "distributed: split to 1 loops and 1 library calls" 1 "ldist" } } */
  32 /* { dg-final { scan-tree-dump-times "generated memset zero" 1 "ldist" } } */