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__(16)));
  11 unsigned char Y[N] __attribute__ ((__aligned__(16)));
  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   for (i=0; i<N; i++) {
  45     X[i] = i;
  46     Y[i] = 64-i;
  47     if (i%5 == 0)
  48       X[i] = i;
  49   }
  50
  51   dot = foo (N);
  52   if (dot != DOT)
  53     abort ();
  54
  55   return 0;
  56 }
  57
  58 /* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 1 "vect" } } */
  59 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_udot_qi } } } */
  60 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target { vect_widen_mult_qi_to_hi && vect_widen_sum_qi_to_si } } } } */
  61
  62 /* { dg-final { cleanup-tree-dump "vect" } } */
  63