gcc/testsuite/gcc.dg/tree-ssa/loop-16.c

   1 /* A test for # of iterations estimation.  We know that the loop is executed
   2    at most 100 times, thus the (32-bit) induction variables do not overflow,
   3    and we may use 64-bit variable to represent them.  */
   4
   5 /* { dg-options "-O2 -fdump-tree-optimized" } */
   6 /* { dg-do compile { target x86_64-*-* } } */
   7
   8 unsigned a[100];
   9
  10 void foo(unsigned n)
  11 {
  12   unsigned i;
  13
  14   for (i = 0; i < n; i++)
  15     a[i] = 4 * i;
  16 }
  17
  18 /* Check that the memory reference was replaced with MEM, and that there is no
  19    multiplication.  */
  20
  21 /* { dg-final { scan-tree-dump-times "MEM" 1 "optimized" } } */
  22 /* { dg-final { scan-tree-dump-times "\[^\\n\\r\]*= \\* " 0 "optimized" } } */
  23
  24 /* { dg-final { cleanup-tree-dump "optimized" } } */