gcc/testsuite/gcc.dg/vect/fast-math-vect-reduc-5.c

   1 /* { dg-additional-options "-ffast-math" } */
   2 /* { dg-require-effective-target vect_float } */
   3
   4 /* need -funsafe-math-optimizations to vectorize the summation.
   5    also need -ffinite-math-only to create the min/max expr.  */
   6
   7 #include <stdarg.h>
   8 #include "tree-vect.h"
   9
  10 #define N 16
  11 #define DIFF 242
  12
  13 float b[N] = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};
  14 float c[N] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
  15
  16 int main1 (float x, float max_result)
  17 {
  18   int i;
  19   float diff = 2;
  20   float max = x;
  21   float min = 10;
  22
  23   for (i = 0; i < N; i++) {
  24     diff += (b[i] - c[i]);
  25   }
  26
  27   for (i = 0; i < N; i++) {
  28     max = max < c[i] ? c[i] : max;
  29   }
  30
  31   for (i = 0; i < N; i++) {
  32     min = min > c[i] ? c[i] : min;
  33   }
  34
  35   /* check results:  */
  36   if (diff != DIFF)
  37     abort ();
  38   if (max != max_result)
  39     abort ();
  40   if (min != 0)
  41     abort ();
  42
  43   return 0;
  44 }
  45
  46 int main (void)
  47 {
  48   check_vect ();
  49
  50   main1 (100, 100);
  51   main1 (0, 15);
  52   return 0;
  53 }
  54
  55 /* { dg-final { scan-tree-dump-times "vectorized 3 loops" 1 "vect" } } */