gcc/testsuite/gcc.dg/vect/vect-reduc-6.c

   1 /* { dg-require-effective-target vect_float_strict } */
   2 /* { dg-additional-options "-fno-fast-math" } */
   3
   4 #include <stdarg.h>
   5 #include "tree-vect.h"
   6
   7 #define N 16
   8 #define DIFF 242
   9
  10 __attribute__ ((noinline))
  11 int main1 (float x, float max_result)
  12 {
  13   int i;
  14   float b[N] = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};
  15   float c[N] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
  16   float diff = 2;
  17   float max = x;
  18   float min = 10;
  19
  20   for (i = 0; i < N; i++) {
  21     diff += (b[i] - c[i]);
  22   }
  23
  24   for (i = 0; i < N; i++) {
  25     max = max < c[i] ? c[i] : max;
  26   }
  27
  28   for (i = 0; i < N; i++) {
  29     min = min > c[i] ? c[i] : min;
  30   }
  31
  32   /* check results:  */
  33   if (diff != DIFF)
  34     abort ();
  35   if (max != max_result)
  36     abort ();
  37   if (min != 0)
  38     abort ();
  39
  40   return 0;
  41 }
  42
  43 int main (void)
  44 {
  45   check_vect ();
  46
  47   main1 (100 ,100);
  48   main1 (0, 15);
  49   return 0;
  50 }
  51
  52 /* { dg-final { scan-tree-dump-times {using an in-order \(fold-left\) reduction} 1 "vect" } } */
  53 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */