gnu/dist/gcc4/gcc/testsuite/gcc.dg/tree-ssa/loop-3.c

   1 /* A test for strength reduction and induction variable elimination.
   2    Target is restricted to x86 type architectures, so that we may
   3    assume something about memory addressing modes.  */
   4
   5 /* { dg-do compile { target i?86-*-* x86_64-*-* } } */
   6 /* { dg-skip-if "" { i?86-*-* x86_64-*-* } { "-fpic" "-fPIC" } { "" } } */
   7 /* { dg-options "-O1 -fno-pic -fno-PIC -fdump-tree-vars" } */
   8
   9 int arr_base[100];
  10
  11 int foo(int);
  12
  13 void xxx(void)
  14 {
  15   long iter;
  16
  17   for (iter = 0; iter < 100; iter++)
  18     arr_base[iter] = foo (iter);
  19 }
  20
  21 /* Access to arr_base[iter].y should not be strength reduced, since
  22    we have a memory mode including multiplication by 4.  */
  23
  24 /* { dg-final { scan-tree-dump-times "MEM" 1 "vars" } } */
  25 /* { dg-final { scan-tree-dump-times "step:" 1 "vars" } } */
  26
  27 /* And original induction variable should be preserved.  */
  28
  29 /* { dg-final { scan-tree-dump-times "int iter" 1 "vars" } } */
  30
  31 /* { dg-final { cleanup-tree-dump "vars" } } */