gcc/testsuite/gcc.dg/tree-ssa/ldist-33.c

   1 /* { dg-do compile { target size32plus } } */
   2 /* The desire is to show we can generate a memset from the outer loop
   3    store.  Both store motion and PRE expose a DSE opportunity for this
   4    zeroing - while desirable this defeats the purpose of this testcase.  */
   5 /* { dg-options "-O2 -fno-tree-loop-im -fno-tree-pre -ftree-loop-distribution -ftree-loop-distribute-patterns -fdump-tree-ldist-details" } */
   6
   7 #define N (1024)
   8 double a[N][N], b[N][N], c[N][N];
   9
  10 void
  11 foo (void)
  12 {
  13   unsigned i, j, k;
  14
  15   for (i = 0; i < N; ++i)
  16     for (j = 0; j < N; ++j)
  17       {
  18         c[i][j] = 0.0;
  19         for (k = 0; k < N; ++k)
  20           c[i][j] += a[i][k] * b[k][j];
  21       }
  22 }
  23
  24 /* { dg-final { scan-tree-dump "Loop nest . distributed: split to 1 loops and 1 library" "ldist" } } */