gcc/testsuite/gcc.dg/vect/vect-double-reduc-1.c

   1 /* { dg-require-effective-target vect_int_mult } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 #define K 32
   7
   8 int in[2*K][K] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
   9 int coeff[K][K] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  10 int out[K];
  11 int check_result[K] = {642816,660736,678656,696576,714496,732416,750336,768256,786176,804096,822016,839936,857856,875776,893696,911616,929536,947456,965376,983296,1001216,1019136,1037056,1054976,1072896,1090816,1108736,1126656,1144576,1162496,1180416,1198336};
  12
  13 __attribute__ ((noinline)) void
  14 foo ()
  15 {
  16   int sum = 0, i, j, k;
  17
  18   for (k = 0; k < K; k++)
  19     {
  20       sum = 0;
  21       for (j = 0; j < K; j++)
  22         for (i = 0; i < K; i++)
  23           sum += in[i+k][j] * coeff[i][j];
  24
  25       out[k] = sum;
  26     }
  27 }
  28
  29 int main ()
  30 {
  31   int i, j, k;
  32
  33   check_vect ();
  34
  35   for  (j = 0; j < K; j++)
  36     {
  37       for (i = 0; i < 2*K; i++)
  38         in[i][j] = i+j;
  39
  40       for (i = 0; i < K; i++)
  41         coeff[i][j] = i+2;
  42     }
  43
  44   foo();
  45
  46   for (k = 0; k < K; k++)
  47     if (out[k] != check_result[k])
  48       abort ();
  49
  50   return 0;
  51 }
  52
  53 /* { dg-final { scan-tree-dump-times "OUTER LOOP VECTORIZED" 1 "vect" } } */
  54