gcc/testsuite/gcc.dg/vect/vect-avg-1.c

   1 /* { dg-require-effective-target vect_int } */
   2 /* { dg-additional-options "-fdump-tree-optimized" } */
   3
   4 #include "tree-vect.h"
   5
   6 #define N 50
   7
   8 #ifndef SIGNEDNESS
   9 #define SIGNEDNESS unsigned
  10 #endif
  11 #ifndef BIAS
  12 #define BIAS 0
  13 #endif
  14
  15 void __attribute__ ((noipa))
  16 f (SIGNEDNESS char *restrict a, SIGNEDNESS char *restrict b,
  17    SIGNEDNESS char *restrict c)
  18 {
  19   for (__INTPTR_TYPE__ i = 0; i < N; ++i)
  20     a[i] = (b[i] + c[i] + BIAS) >> 1;
  21 }
  22
  23 #define BASE1 ((SIGNEDNESS int) -1 < 0 ? -126 : 4)
  24 #define BASE2 ((SIGNEDNESS int) -1 < 0 ? -101 : 26)
  25
  26 int
  27 main (void)
  28 {
  29   check_vect ();
  30
  31   SIGNEDNESS char a[N], b[N], c[N];
  32   for (int i = 0; i < N; ++i)
  33     {
  34       b[i] = BASE1 + i * 5;
  35       c[i] = BASE2 + i * 4;
  36       asm volatile ("" ::: "memory");
  37     }
  38   f (a, b, c);
  39 #pragma GCC novector
  40   for (int i = 0; i < N; ++i)
  41     if (a[i] != ((BASE1 + BASE2 + i * 9 + BIAS) >> 1))
  42       __builtin_abort ();
  43   return 0;
  44 }
  45
  46 /* { dg-final { scan-tree-dump "vect_recog_average_pattern: detected" "vect" } } */
  47 /* { dg-final { scan-tree-dump {\.AVG_FLOOR} "vect" { target vect_avg_qi } } } */
  48 /* { dg-final { scan-tree-dump-not {vector\([^\n]*short} "optimized" { target vect_avg_qi } } } */
  49 /* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" { target vect_avg_qi } } } */