gcc/testsuite/gcc.target/i386/avx2-i32gatherps-2.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target avx2 } */
   3 /* { dg-options "-O2 -mavx2" } */
   4
   5 #include <string.h>
   6 #include "avx2-check.h"
   7
   8 static void
   9 compute_i32gatherps (float *s1, int *s2, int scale, float *r)
  10 {
  11   int i;
  12
  13   for (i = 0; i < 4; ++i)
  14     r[i] = *(float *) (((unsigned char *) s1) + s2[i] * scale);
  15 }
  16
  17 void static
  18 avx2_test (void)
  19 {
  20   int i;
  21   union128i_d idx;
  22   union128 res;
  23   float s1[4], res_ref[4] = { 0 };
  24
  25   for (i = 0; i < 4; ++i)
  26     {
  27       /* Set some stuff */
  28       s1[i] = 2.718281828459045 * (i + 1) * (i + 2);
  29
  30       /* About to gather in reverse order,
  31          divide by 2 to demonstrate scale */
  32       idx.a[i] = (16 - (i + 1) * 4) >> 1;
  33     }
  34
  35   res.x = _mm_i32gather_ps (s1, idx.x, 2);
  36
  37   compute_i32gatherps (s1, idx.a, 2, res_ref);
  38
  39   if (check_union128 (res, res_ref) != 0)
  40     abort ();
  41 }