gcc/testsuite/gcc.dg/vect/slp-9.c

/* { dg-require-effective-target vect_int } */
/* { dg-additional-options "-fno-early-inlining" } */

#include <stdarg.h>
#include "tree-vect.h"

#define N 64

short X[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
short Y[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
int result[N];

/* short->int widening-mult */
int
foo1(int len) {
  int i;

  for (i=0; i<len/2; i++) {
    result[2*i] = X[2*i] * Y[2*i];
    result[2*i+1] = X[2*i+1] * Y[2*i+1];
  }
}

int main (void)
{
  int i;

  check_vect ();

  for (i=0; i<N; i++) {
    X[i] = i;
    Y[i] = 64-i;
    __asm__ volatile ("");
  }

  foo1 (N);

  for (i=0; i<N; i++) {
    if (result[i] != X[i] * Y[i])
      abort ();
  }
  
  return 0;
}

/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_widen_mult_hi_to_si } } }*/
/* { dg-final { scan-tree-dump "vectorizing stmts using SLP" "vect" { target vect_widen_mult_hi_to_si } } } */