gcc/testsuite/gcc.dg/vect/wrapv-vect-reduc-dot-s8b.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 -21856
   9
  10 signed 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 signed 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    The dot-product pattern should be detected.
  15    Should be vectorized on vect_sdot_qi targets (targets that support
  16    dot-product of signed char).
  17    This test currently fails to vectorize on targets that support
  18    dot-product of chars into and int accumulator.
  19    Can also be vectorized as widening-mult + summation,
  20    or with type-conversion support.
  21  */
  22 __attribute__ ((noinline)) short
  23 foo(int len) {
  24   int i;
  25   short result = 0;
  26
  27   for (i=0; i<len; i++) {
  28     result += (X[i] * Y[i]);
  29   }
  30   return result;
  31 }
  32
  33 int main (void)
  34 {
  35   int i;
  36   short dot;
  37
  38   check_vect ();
  39
  40   dot = foo (N);
  41   if (dot != DOT)
  42     abort ();
  43
  44   return 0;
  45 }
  46
  47 /* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 1 "vect" } } */
  48 /* { dg-final { scan-tree-dump-times "vect_recog_widen_mult_pattern: detected" 1 "vect" } } */
  49
  50 /* When vectorizer is enhanced to vectorize accumulation into short for targets
  51    that support accumulation into int (e.g. ia64) we'd have:
  52 dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_sdot_qi } }
  53 */
  54 /* In the meantime expect: */
  55 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target { vect_widen_mult_qi_to_hi || vect_unpack } } } } */
  56