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/* { dg-require-effective-target vect_int } */

#include <stdarg.h>

#include "tree-vect.h"

#define N 64

#define DOT2 -21856

signed char X[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));

signed char Y[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));

/* char->short->short dot product.

   The dot-product pattern should be detected.

   The reduction is currently not vectorized becaus of the signed->unsigned->signed

   casts, since this patch:

     2005-12-26  Kazu Hirata  <kazu@codesourcery.com>

        PR tree-optimization/25125

   When the dot-product is detected, the loop should be vectorized on vect_sdot_qi

   targets (targets that support dot-product of signed char).

   This test would currently fail to vectorize on targets that support

   dot-product of chars into an int accumulator.

   Alternatively, the loop could also be vectorized as widening-mult + summation,

   or with type-conversion support.

 */

__attribute__ ((noinline)) short

foo2(int len) {

  int i;

  short result = 0;

  for (i=0; i<len; i++) {

    result += (X[i] * Y[i]);

  }

  return result;

}

int main (void)

{

  int i;

  short dot2;

  check_vect ();

  for (i=0; i<N; i++) {

    X[i] = i;

    Y[i] = 64-i;

    __asm__ volatile ("");

  }

  dot2 = foo2 (N);

  if (dot2 != DOT2)

    abort ();

  return 0;

}

/* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 1 "vect" { xfail *-*-* } } } */

/* { dg-final { scan-tree-dump-times "vect_recog_widen_mult_pattern: detected" 1 "vect" { xfail vect_multiple_sizes } } } */

/* { dg-final { scan-tree-dump-times "vect_recog_widen_mult_pattern: detected" 2 "vect" { target vect_multiple_sizes } } } */

/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { xfail *-*-* } } } */

/* { dg-final { cleanup-tree-dump "vect" } } */