ssa-pre-3.c

来自「Mac OS X 10.4.9 for x86 Source Code gcc」· C语言 代码 · 共 15 行

/* { dg-do compile } */ 
/* { dg-options "-O2 -fdump-tree-pre-stats" } */
unsigned foo1 (unsigned a, unsigned b)
{
  unsigned i, j, k;
  for (i = 0; i != a; i++)
    {
      j += 4*b;
      k += 4*a;
    }
  return j + k;
}
/* We should eliminate both 4*b and 4*a from the main body of the loop */
/* { dg-final { scan-tree-dump-times "Eliminated:2" 1 "pre"} } */