File: ssa-dom-cse-3.c

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gcc-arm-none-eabi 15%3A8-2019-q3-1
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/* { dg-do run } */
/* { dg-options "-O -fno-tree-fre -fdump-tree-dom2" } */

extern void abort (void);

int a;
int __attribute__((noinline))
foo (int b)
{
  a = 0;
  if (b)
    {
      a = 1;
      return a;
    }
  /* DOM should be able to CSE both loads here, forwarding 0 and 1
     to the PHI feeding the return.  */
  return a;
}

int
main()
{
  if (foo (0) != 0
      || foo (1) != 1)
    abort ();
  return 0;
}

/* { dg-final { scan-tree-dump "= PHI <\[01\]\\\(.\\\), \[01\]\\\(.\\\)>" "dom2" } } */