gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u8b.c

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