gcc/testsuite/gcc.c-torture/execute/builtin-prefetch-1.c

   1 /* Test that __builtin_prefetch does no harm.
   2
   3    Prefetch using all valid combinations of rw and locality values.
   4    These must be compile-time constants.  */
   5
   6 #define NO_TEMPORAL_LOCALITY 0
   7 #define LOW_TEMPORAL_LOCALITY 1
   8 #define MODERATE_TEMPORAL_LOCALITY 1
   9 #define HIGH_TEMPORAL_LOCALITY 3
  10
  11 #define WRITE_ACCESS 1
  12 #define READ_ACCESS 0
  13
  14 enum locality { none, low, moderate, high };
  15 enum rw { read, write };
  16
  17 int arr[10];
  18
  19 void
  20 good_const (const int *p)
  21 {
  22   __builtin_prefetch (p, 0, 0);
  23   __builtin_prefetch (p, 0, 1);
  24   __builtin_prefetch (p, 0, 2);
  25   __builtin_prefetch (p, READ_ACCESS, 3);
  26   __builtin_prefetch (p, 1, NO_TEMPORAL_LOCALITY);
  27   __builtin_prefetch (p, 1, LOW_TEMPORAL_LOCALITY);
  28   __builtin_prefetch (p, 1, MODERATE_TEMPORAL_LOCALITY);
  29   __builtin_prefetch (p, WRITE_ACCESS, HIGH_TEMPORAL_LOCALITY);
  30 }
  31
  32 void
  33 good_enum (const int *p)
  34 {
  35     __builtin_prefetch (p, read, none);
  36     __builtin_prefetch (p, read, low);
  37     __builtin_prefetch (p, read, moderate);
  38     __builtin_prefetch (p, read, high);
  39     __builtin_prefetch (p, write, none);
  40     __builtin_prefetch (p, write, low);
  41     __builtin_prefetch (p, write, moderate);
  42     __builtin_prefetch (p, write, high);
  43 }
  44
  45 void
  46 good_expr (const int *p)
  47 {
  48   __builtin_prefetch (p, 1 - 1, 6 - (2 * 3));
  49   __builtin_prefetch (p, 1 + 0, 1 + 2);
  50 }
  51
  52 void
  53 good_vararg (const int *p)
  54 {
  55   __builtin_prefetch (p, 0, 3);
  56   __builtin_prefetch (p, 0);
  57   __builtin_prefetch (p, 1);
  58   __builtin_prefetch (p);
  59 }
  60
  61 int
  62 main ()
  63 {
  64   good_const (arr);
  65   good_enum (arr);
  66   good_expr (arr);
  67   good_vararg (arr);
  68   exit (0);
  69 }