gcc/testsuite/gcc.dg/tree-ssa/loop-19.c

   1 /* This tests strength reduction and choice of induction variables.  The targets
   2    for this testcase are quite limited, as with different set of available
   3    addressing modes, the results may be quite different.
   4
   5    The testcase comes from PR 29256 (and originally, the stream benchmark).  */
   6
   7 /* { dg-do compile { target { i?86-*-* || { x86_64-*-* || { powerpc_hard_double && { ! powerpc_fprs } } } } } } */
   8 /* { dg-require-effective-target nonpic } */
   9 /* { dg-options "-O3 -fno-tree-loop-distribute-patterns -fno-prefetch-loop-arrays -fdump-tree-optimized -fno-common" } */
  10
  11 # define N      2000000
  12 double   a[N],c[N];
  13 void tuned_STREAM_Copy()
  14 {
  15   int j;
  16   for (j=0; j<N; j++)
  17     c[j] = a[j];
  18 }
  19
  20 /* Check that the memory references are based on &a and &c, with appropriate
  21    offsets.  Ideally, we would want each of them to appear once in the output.
  22    However, due to a bug in jump threading, we end up peeling one iteration from
  23    the loop, which creates an additional occurrence.  */
  24
  25 /* { dg-final { scan-tree-dump-times "MEM.(base: &|symbol: )a," 2 "optimized" } } */
  26 /* { dg-final { scan-tree-dump-times "MEM.(base: &|symbol: )c," 2 "optimized" } } */
  27