gcc/testsuite/gcc.dg/tree-ssa/ldist-pr45948.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -ftree-loop-distribution -ftree-loop-distribute-patterns -fdump-tree-ldist-details -fdump-tree-optimized" } */
   3
   4 extern void bar(int);
   5
   6 void
   7 foo (unsigned i, unsigned n)
   8 {
   9   int a[30];
  10   int b[30];
  11   if (n == 0)
  12     return;
  13   for (i=0; i < n; i++)
  14     a[i] = b[i] = 0;
  15
  16   while (1)
  17     if (b[0])
  18       bar (a[i - 1]);
  19 }
  20
  21 /* We should apply loop distribution and generate 1 memset (0).  PRE optimizes
  22    away a[] completely.  */
  23
  24 /* { dg-final { scan-tree-dump "distributed: split to 0 loops and 1 library calls" "ldist" } } */
  25 /* { dg-final { scan-tree-dump-times "generated memset zero" 1 "ldist" } } */
  26 /* { dg-final { scan-tree-dump-times "int a" 0 "optimized" } } */