gcc/testsuite/gcc.dg/vect/vect-reduc-dot-s8a.c

   1 /* { dg-require-effective-target vect_int } */
   2 /* { dg-require-effective-target arm_v8_2a_dotprod_neon_hw { target { aarch64*-*-* || arm*-*-* } } } */
   3 /* { dg-additional-options "-march=armv8.2-a+dotprod" { target { aarch64*-*-* } } } */
   4 /* { dg-add-options arm_v8_2a_dotprod_neon }  */
   5
   6 #include <stdarg.h>
   7 #include "tree-vect.h"
   8
   9 #define N 64
  10
  11 #define DOT1 43680
  12
  13 signed char X[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  14 signed char Y[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  15
  16 /* char->short->int dot product.
  17    The dot-product pattern should be detected.
  18    Vectorizable on vect_sdot_qi targets (targets that support dot-product of
  19    signed chars).
  20
  21    In the future could also be vectorized as widening-mult + widening-summation,
  22    or with type-conversion support.
  23  */
  24 __attribute__ ((noinline)) int
  25 foo1(int len) {
  26   int i;
  27   int result = 0;
  28   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   int i, dot1;
  40
  41   check_vect ();
  42
  43   for (i=0; i<N; i++) {
  44     X[i] = i;
  45     Y[i] = 64-i;
  46     __asm__ volatile ("");
  47   }
  48
  49   dot1 = foo1 (N);
  50   if (dot1 != DOT1)
  51     abort ();
  52
  53   return 0;
  54 }
  55
  56 /* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 1 "vect" } } */
  57 /* { dg-final { scan-tree-dump-times "vect_recog_widen_mult_pattern: detected" 1 "vect" } } */
  58 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_sdot_qi } } } */
  59 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target { vect_widen_mult_qi_to_hi && vect_widen_sum_hi_to_si } } } } */
  60