gcc/testsuite/gcc.target/i386/pr44180.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target avx } */
   3 /* { dg-options "-O2 -ftree-vectorize -mavx -mtune=generic" } */
   4
   5 #include "avx-check.h"
   6
   7 #define N 16
   8
   9 float b[N] = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};
  10 float c[N] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
  11 float d[N] = {0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30};
  12
  13 static void
  14 __attribute__ ((noinline))
  15 avx_test ()
  16 {
  17   int i;
  18   float a[N];
  19
  20   /* Strided access. Vectorizable on platforms that support load of strided
  21      accesses (extract of even/odd vector elements).  */
  22   for (i = 0; i < N/2; i++)
  23     {
  24       a[i] = b[2*i+1] * c[2*i+1] - b[2*i] * c[2*i];
  25       d[i] = b[2*i] * c[2*i+1] + b[2*i+1] * c[2*i];
  26     }
  27
  28   /* Check results.  */
  29   for (i = 0; i < N/2; i++)
  30     {
  31       if (a[i] != b[2*i+1] * c[2*i+1] - b[2*i] * c[2*i]
  32           || d[i] != b[2*i] * c[2*i+1] + b[2*i+1] * c[2*i])
  33         abort();
  34     }
  35 }