gcc/testsuite/gcc.dg/tree-ssa/slsr-8.c

   1 /* Verify straight-line strength reduction for simple pointer subtraction.  */
   2
   3 /* { dg-do compile } */
   4 /* { dg-options "-O3 -fdump-tree-optimized" } */
   5
   6 int*
   7 f (int s, int *c)
   8 {
   9   int a1, a2, a3, *x1, *x2, *x3;
  10
  11   a1 = 2 * s;
  12   x1 = c - a1;
  13   a2 = 4 * s;
  14   x2 = c - a2;
  15   a3 = 6 * s;
  16   x3 = c - a3;
  17   return x1 ? x2 : x3;
  18 }
  19
  20 /* There are 4 ' * ' instances in the decls (since "int * iftmp.0;" is
  21    added), 1 parm, 2 in the code.  The second one in the code can be
  22    a widening mult.  */
  23 /* { dg-final { scan-tree-dump-times " w?\\* " 7 "optimized" } } */
  24 /* { dg-final { cleanup-tree-dump "optimized" } } */