gcc/testsuite/gcc.dg/vect/slp-reduc-8.c

   1 /* { dg-require-effective-target vect_int } */
   2 /* { dg-require-effective-target vect_perm } */
   3
   4 #include "tree-vect.h"
   5
   6 static int a[512], b[512];
   7
   8 void __attribute__((noinline,noclone))
   9 foo (int *sum1p, int *sum2p, int *sum3p)
  10 {
  11   int sum1 = 0;
  12   int sum2 = 0;
  13   int sum3 = 0;
  14   /* Check that we vectorize a reduction chain and a SLP reduction
  15      at the same time.  */
  16   for (int i = 0; i < 256; ++i)
  17     {
  18       sum1 += a[2*i];
  19       sum1 += a[2*i + 1];
  20       sum2 += b[2*i];
  21       sum3 += b[2*i + 1];
  22     }
  23   *sum1p = sum1;
  24   *sum2p = sum2;
  25   *sum3p = sum3;
  26 }
  27
  28 int main()
  29 {
  30   check_vect ();
  31
  32   for (int i = 0; i < 256; ++i)
  33     {
  34       a[2*i] = i;
  35       a[2*i + 1] = i/2;
  36       b[2*i] = i + 1;
  37       b[2*i + 1] = i/2 + 1;
  38       __asm__ volatile ("" : : : "memory");
  39     }
  40   int sum1, sum2, sum3;
  41   foo (&sum1, &sum2, &sum3);
  42   if (sum1 != 48896 || sum2 != 32896 || sum3 != 16512)
  43     abort ();
  44
  45   return 0;
  46 }
  47
  48 /* { dg-final { scan-tree-dump "Loop contains only SLP stmts" "vect" } } */
  49 /* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" } } */