gcc/testsuite/gcc.dg/loop-versioning-3.c

   1 /* { dg-options "-O3 -fdump-tree-lversion-details" } */
   2
   3 /* Versioning these loops for when both steps are 1 allows loop
   4    interchange, but otherwise isn't worthwhile.  At the moment we decide
   5    not to version.  */
   6
   7 void
   8 f1 (double x[][100], int step1, int step2, int n)
   9 {
  10   for (int i = 0; i < n; ++i)
  11     for (int j = 0; j < n; ++j)
  12       x[j * step1][i * step2] = 100;
  13 }
  14
  15 void
  16 f2 (double x[][100], int step1, int step2, int limit)
  17 {
  18   for (int i = 0; i < limit; i += step1)
  19     for (int j = 0; j < limit; j += step2)
  20       x[j][i] = 100;
  21 }
  22
  23 /* { dg-final { scan-tree-dump-not {want to version} "lversion" } } */
  24 /* { dg-final { scan-tree-dump-not {versioned} "lversion" } } */