gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-17.c

/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-pre-stats" } */

typedef union {
  int i;
  float f;
} U;

int foo(U *u, int b, int i)
{
  u->i = 0;
  if (b)
    u->i = i;
  return u->i;
}

/* { dg-final { scan-tree-dump "Eliminated: 1" "pre" } } */