gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u8a.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->int dot product.
  14    Detected as a dot-product pattern.
  15    Should be vectorized on targets that support dot-product for unsigned chars
  16    (vect_udot_qi),
  17    and on targets that support widening-multiplication and widening-summation
  18    (vect_widen_mult_qi && vec_widen_sum_qi_to_si).
  19    Widening-multiplication can also be supported by type promotion and non-widening
  20    multiplication (vect_unpack && vect_short_mult);
  21    Widening summation can also be supported by type promotion and non-widening
  22    summation (vect_unpack).
  23    */
  24 __attribute__ ((noinline)) unsigned int
  25 foo (int len) {
  26   int i;
  27   unsigned int result = 0;
  28   unsigned short prod;
  29
  30   for (i=0; i<len; i++) {
  31     prod = X[i] * Y[i];
  32     result += prod;
  33   }
  34   return result;
  35 }
  36
  37 int main (void)
  38 {
  39   unsigned int dot;
  40   int i;
  41
  42   check_vect ();
  43
  44   dot = foo (N);
  45   if (dot != DOT)
  46     abort ();
  47
  48   return 0;
  49 }
  50
  51 /* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 1 "vect" } } */
  52 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_udot_qi } } } */
  53 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target { vect_widen_mult_qi_to_hi && vect_widen_sum_qi_to_si } } } } */
  54
  55 /* { dg-final { cleanup-tree-dump "vect" } } */
  56