gcc/testsuite/gcc.dg/guality/pr58791-5.c

/* PR tree-optimization/58791 */
/* { dg-do run } */
/* { dg-options "-g" } */

#include "../nop.h"

__attribute__((noinline, noclone)) unsigned int
foo (unsigned int a0, unsigned int a1, unsigned int a2,
     unsigned int a3, unsigned int a4)
{
  unsigned int b0, b1, b2, b3, b4, e;
  /* this can be optimized to four additions... */
  b4 = a4 + a3 + a2 + a1 + a0;		/* { dg-final { gdb-test pr58791-5.c:20 "b4" "4681" } } */
  b3 = a3 + a2 + a1 + a0;		/* { dg-final { gdb-test pr58791-5.c:20 "b3" "585" } } */
  b2 = a2 + a1 + a0;			/* { dg-final { gdb-test pr58791-5.c:20 "b2" "73" } } */
  b1 = a1 + a0;				/* { dg-final { gdb-test pr58791-5.c:20 "b1" "9" } } */
  /* This is actually 0 */
  e = b4 - b3 + b2 - b1 - a4 - a2;	/* { dg-final { gdb-test pr58791-5.c:20 "e" "0" } } */
  asm volatile (NOP : : : "memory");
  asm volatile (NOP : : : "memory");
  return e;
}

int
main ()
{
  foo (1, 8, 64, 512, 4096);
  return 0;
}