gcc/testsuite/gcc.dg/tree-ssa/loop-interchange-16.c

   1 /* PR/101280 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O3 -fdump-tree-linterchange-details" } */
   4
   5 void dummy (double *, double *);
   6 #define LEN_2D 32
   7 double aa[LEN_2D][LEN_2D], bb[LEN_2D][LEN_2D];
   8 double s231(int iterations)
   9 {
  10 //    loop interchange
  11 //    loop with data dependency
  12     for (int nl = 0; nl < 100*(iterations/LEN_2D); nl++) {
  13         for (int i = 0; i < LEN_2D; ++i) {
  14 #pragma GCC unroll 0
  15             for (int j = 1; j < LEN_2D; j++) {
  16                 aa[j][i] = aa[j - 1][i] + bb[j][i];
  17             }
  18         }
  19         dummy(aa[0],bb[0]);
  20     }
  21 }
  22
  23 /* { dg-final { scan-tree-dump "loops interchanged" "linterchange" } } */