Viewing file:  vect-reduc-dot-u8b.c (1.99 KB) -rw-r--r--
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/* Disabling epilogues until we find a better way to deal with scans. */
/* { dg-additional-options "--param vect-epilogues-nomask=0" } */
/* { dg-require-effective-target vect_int } */
#include <stdarg.h>
#include "tree-vect.h"
#define N 64
#define DOT 43680
unsigned char X[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__))) = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63};
unsigned char Y[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__))) = {64,63,62,61,60,59,58,57,56,55,54,53,52,51,50,49,48,47,46,45,44,43,42,41,40,39,38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1};
/* char->short->short dot product.
Detected as a dot-product pattern.
Should be vectorized on targets that support dot-product for unsigned chars,
but currently this test cannot be vectorized as a dot-product on targets
that support char->short->int dot-product.
Alternatively, this test can be vectorized using vect_widen_mult_qi (or
vect_unpack and non-widening multplication: vect_unpack && vect_short_mult).
*/
__attribute__ ((noinline)) unsigned short
foo (int len) {
int i;
unsigned short result = 0;
for (i=0; i<len; i++) {
result += (unsigned short)(X[i] * Y[i]);
}
return result;
}
int main (void)
{
unsigned short dot;
int i;
check_vect ();
dot = foo (N);
if (dot != DOT)
abort ();
return 0;
}
/* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 1 "vect" } } */
/* When the vectorizer is enhanced to vectorize accumulation into short for
targets that support accumulation into int (powerpc, ia64) we'd have:
dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_udot_qi || vect_widen_mult_qi_to_hi } }
*/
/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" {target { vect_widen_mult_qi_to_hi || vect_unpack } } } } */
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