gcc/testsuite/gcc.dg/vect/slp-reduc-3.c

   1 /* { dg-require-effective-target vect_int } */
   2 /* { dg-additional-options "--param=vect-epilogues-nomask=0" } */
   3
   4 #include <stdarg.h>
   5 #include "tree-vect.h"
   6
   7 #define N 64
   8
   9 #define DOT1 21834
  10 #define DOT2 21876
  11
  12 unsigned short X[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  13 unsigned short Y[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  14
  15 /* short->short->int dot product.
  16    Not detected as a dot-product pattern.
  17    Requires support for non-widneing multiplication and widening-summation.
  18    Vectorized with loop-aware SLP. */
  19 __attribute__ ((noinline)) unsigned int
  20 foo1(int len, int *result1, int *result2)
  21 {
  22   int i;
  23   unsigned int res1 = 10, res2 = 20;
  24   unsigned short prod;
  25
  26   for (i=0; i<len; i++) {
  27     prod = X[2*i] * Y[2*i];
  28     res1 += prod;
  29     prod = X[2*i+1] * Y[2*i+1];
  30     res2 += prod;
  31   }
  32
  33   *result1 = res1;
  34   *result2 = res2;
  35
  36   return 0;
  37 }
  38
  39 int main (void)
  40 {
  41   unsigned int dot1, dot2;
  42   unsigned short i;
  43
  44   check_vect ();
  45
  46   for (i=0; i<N; i++) {
  47     X[i] = i;
  48     Y[i] = 64-i;
  49     asm volatile ("" ::: "memory");
  50   }
  51
  52   foo1 (N/2, &dot1, &dot2);
  53
  54   if (dot1 != DOT1 || dot2 != DOT2)
  55     abort ();
  56
  57   return 0;
  58 }
  59
  60 /* The initialization loop in main also gets vectorized.  */
  61 /* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 1 "vect" { xfail *-*-* } } } */
  62 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target { vect_short_mult && { vect_widen_sum_hi_to_si  && vect_unpack } } } } } */
  63 /* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 1 "vect" { xfail { vect_widen_sum_hi_to_si_pattern || { ! { vect_short_mult && { vect_widen_sum_hi_to_si  && vect_unpack } } } } } } } */
  64 /* Check we can elide permutes if SLP vectorizing the reduction.  */
  65 /* { dg-final { scan-tree-dump-times " = VEC_PERM_EXPR" 0 "vect" { xfail { { { vect_widen_sum_hi_to_si_pattern || { ! vect_unpack } } && { ! vect_load_lanes } } && { vect_short_mult && { vect_widen_sum_hi_to_si  && vect_unpack } } } } } } */