gcc/testsuite/gcc.dg/vect/vect-avg-16.c

   1 /* { dg-additional-options "-O3" } */
   2 /* { dg-require-effective-target vect_int } */
   3
   4 #include "tree-vect.h"
   5
   6 #define N 80
   7
   8 void __attribute__ ((noipa))
   9 f (signed char *restrict a, signed char *restrict b,
  10    signed char *restrict c, int n)
  11 {
  12   for (int j = 0; j < n; ++j)
  13     {
  14       for (int i = 0; i < 16; ++i)
  15         a[i] = (b[i] + c[i]) >> 1;
  16       a += 20;
  17       b += 20;
  18       c += 20;
  19     }
  20 }
  21
  22 #define BASE1 -126
  23 #define BASE2 -42
  24
  25 signed char a[N], b[N], c[N];
  26
  27 int
  28 main (void)
  29 {
  30   check_vect ();
  31
  32   for (int i = 0; i < N; ++i)
  33     {
  34       a[i] = i;
  35       b[i] = BASE1 + i * 3;
  36       c[i] = BASE2 + i * 2;
  37       asm volatile ("" ::: "memory");
  38     }
  39   f (a, b, c, N / 20);
  40 #pragma GCC novector
  41   for (int i = 0; i < N; ++i)
  42     {
  43       int d = (BASE1 + BASE2 + i * 5) >> 1;
  44       if (a[i] != (i % 20 < 16 ? d : i))
  45         __builtin_abort ();
  46     }
  47   return 0;
  48 }
  49
  50 /* { dg-final { scan-tree-dump "vect_recog_average_pattern: detected" "vect" } } */
  51 /* { dg-final { scan-tree-dump {\.AVG_FLOOR} "vect" { target vect_avg_qi } } } */
  52 /* { dg-final { scan-tree-dump "Loop contains only SLP stmts" "vect" { target vect_avg_qi } } } */
  53 /* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" { target vect_avg_qi } } } */