gcc/testsuite/gcc.dg/vect/vect-reduc-dot-s16a.c

   1 /* Disabling epilogues until we find a better way to deal with scans.  */
   2 /* { dg-additional-options "--param vect-epilogues-nomask=0" } */
   3 /* { dg-require-effective-target vect_int } */
   4
   5 #include <stdarg.h>
   6 #include "tree-vect.h"
   7
   8 #define N 64
   9 #define DOT 43680
  10
  11 signed short X[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  12 signed short Y[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  13
  14 /* short->int->int dot product.
  15    Detected as a dot-product pattern.
  16    Vectorized on targets that support dot-product for signed shorts.  */
  17
  18 __attribute__ ((noinline)) int
  19 foo (int len)
  20 {
  21   int i;
  22   int result = 0;
  23
  24   for (i = 0; i < len; i++)
  25     {
  26       result += (X[i] * Y[i]);
  27     }
  28   return result;
  29 }
  30
  31
  32 int
  33 main (void)
  34 {
  35   int i;
  36   int dot;
  37
  38   check_vect ();
  39
  40   for (i = 0; i < N; i++)
  41     {
  42       X[i] = i;
  43       Y[i] = N - i;
  44       __asm__ volatile ("");
  45     }
  46
  47   dot = foo (N);
  48   if (dot != DOT)
  49     abort ();
  50
  51   return 0;
  52 }
  53
  54 /* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected(?:(?!Analysis failed).)*Analysis succeeded" 1 "vect" { target { vect_sdot_hi || vect_widen_mult_hi_to_si } } } } */
  55 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_sdot_hi } } } */
  56 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_widen_mult_hi_to_si } } } */
  57