Viewing file:  builtin-prefetch-1.c (1.53 KB) -rw-r--r--
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/* Test that __builtin_prefetch does no harm.
Prefetch using all valid combinations of rw and locality values.
These must be compile-time constants. */
#define NO_TEMPORAL_LOCALITY 0
#define LOW_TEMPORAL_LOCALITY 1
#define MODERATE_TEMPORAL_LOCALITY 1
#define HIGH_TEMPORAL_LOCALITY 3
#define WRITE_ACCESS 1
#define READ_ACCESS 0
enum locality { none, low, moderate, high };
enum rw { read, write };
int arr[10];
void
good_const (const int *p)
{
__builtin_prefetch (p, 0, 0);
__builtin_prefetch (p, 0, 1);
__builtin_prefetch (p, 0, 2);
__builtin_prefetch (p, READ_ACCESS, 3);
__builtin_prefetch (p, 1, NO_TEMPORAL_LOCALITY);
__builtin_prefetch (p, 1, LOW_TEMPORAL_LOCALITY);
__builtin_prefetch (p, 1, MODERATE_TEMPORAL_LOCALITY);
__builtin_prefetch (p, WRITE_ACCESS, HIGH_TEMPORAL_LOCALITY);
}
void
good_enum (const int *p)
{
__builtin_prefetch (p, read, none);
__builtin_prefetch (p, read, low);
__builtin_prefetch (p, read, moderate);
__builtin_prefetch (p, read, high);
__builtin_prefetch (p, write, none);
__builtin_prefetch (p, write, low);
__builtin_prefetch (p, write, moderate);
__builtin_prefetch (p, write, high);
}
void
good_expr (const int *p)
{
__builtin_prefetch (p, 1 - 1, 6 - (2 * 3));
__builtin_prefetch (p, 1 + 0, 1 + 2);
}
void
good_vararg (const int *p)
{
__builtin_prefetch (p, 0, 3);
__builtin_prefetch (p, 0);
__builtin_prefetch (p, 1);
__builtin_prefetch (p);
}
int
main ()
{
good_const (arr);
good_enum (arr);
good_expr (arr);
good_vararg (arr);
exit (0);
}
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