gcc/testsuite/gcc.dg/tree-ssa/loadpre5.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-pre-stats" } */
   3 int p;
   4 int r;
   5
   6 __attribute__ ((noinline))
   7 static int a(void)
   8 {
   9   return p;
  10 }
  11 int foo(int argc)
  12 {
  13   int q;
  14   q = a();
  15
  16   /* We should be able to move the call to a into the if path.
  17      in a perfect world, we'd actually decide that it can't touch
  18      r, and not recompute it at all!.  */
  19   if (argc)
  20     r = 9;
  21   return q + a();
  22 }
  23 /* { dg-final { scan-tree-dump-times "Eliminated: 1" 1 "pre"} } */
  24 /* { dg-final { cleanup-tree-dump "pre" } } */