Subversion Repositories openrisc_2011-10-31

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

#include <stdarg.h>

#include "tree-vect.h"

#define N 64

#define DOT1 43680

#define DOT2 43680

unsigned short X[N] __attribute__ ((__aligned__(16)));

unsigned short Y[N] __attribute__ ((__aligned__(16)));

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

   Not detected as a dot-product pattern.

   Not vectorized due to presence of type-conversions. */

unsigned int

foo1(int len) {

  int i;

  unsigned int result = 0;

  unsigned short prod;

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

    prod = X[i] * Y[i];

    result += prod;

  }

  return result;

}

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

   Currently not detected as a dot-product pattern: the multiplication

   promotes the ushorts to int, and then the product is promoted to unsigned

   int for the addition.  Which results in an int->unsigned int cast, which

   since no bits are modified in the cast should be trivially vectorizable.  */

unsigned int

foo2(int len) {

  int i;

  unsigned int result = 0;

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

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

  }

  return result;

}

int main (void)

{

  unsigned int dot1, dot2;

  int i;

  check_vect ();

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

    X[i] = i;

    Y[i] = 64-i;

  }

  dot1 = foo1 (N);

  if (dot1 != DOT1)

    abort ();

  dot2 = foo2 (N);

  if (dot2 != DOT2)

    abort ();

  return 0;

}

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

/* Once the dot-product pattern is detected in the second loop, we expect

   that loop to be vectorized on vect_udot_hi targets (targets that support

   dot-product of unsigned shorts).  */

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

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