Edit

Share via

PreFetchCacheLine macro (winnt.h)

  • Article

Indicates to the processor that a cache line will be needed in the near future.

Syntax

void PreFetchCacheLine(
   l,
   a
);

Parameters

l

How often the cache line will be needed. This parameter can be one of the following values.

Value Meaning
PF_TEMPORAL_LEVEL_1
 The cache line should be loaded into all caches and is likely to be accessed multiple times.
PF_NON_TEMPORAL_LEVEL_ALL
 The cache line is not likely to be needed again after the first reference.

a

The address of the cache line to be loaded. This address is not required to be on a cache line boundary.

Return value

None

Remarks

This macro can be called on all processor platforms where Windows is supported, but it has no effect on some platforms. The definition varies from platform to platform. The following are some definitions of this macro in Winnt.h:

#define PreFetchCacheLine(l, a)  _mm_prefetch((CHAR CONST *) a, l)

#define PreFetchCacheLine(l, a)

#define PreFetchCacheLine  __lfetch

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header winnt.h (include Windows.h)