85b60cf2bd
are 3 arguments: the pointer to the memory location to prefetch, the type of operation that will be done on the memory (read or write) and the expected locality. This commit was SVN r10294.
59 строки
1.4 KiB
C
59 строки
1.4 KiB
C
/*
|
|
* Copyright (c) 2004-2006 The Regents of the University of California.
|
|
* All rights reserved.
|
|
* $COPYRIGHT$
|
|
*
|
|
* Additional copyrights may follow
|
|
*
|
|
* $HEADER$
|
|
*/
|
|
|
|
/** @file
|
|
*
|
|
* Compiler-specific prefetch functions
|
|
*
|
|
* A small set of prefetch / prediction interfaces for using compiler
|
|
* directives to improve memory prefetching and branch prediction
|
|
*/
|
|
|
|
#ifndef OPAL_PREFETCH_H
|
|
#define OPAL_PREFETCH_H
|
|
|
|
#if defined(c_plusplus) || defined(__cplusplus)
|
|
/* C++ code */
|
|
|
|
#if OMPI_CXX_HAVE_BUILTIN_EXPECT
|
|
#define OPAL_LIKELY(expression) __builtin_expect(!!(expression), 1)
|
|
#define OPAL_UNLIKELY(expression) __builtin_expect(!!(expression), 0)
|
|
#else
|
|
#define OPAL_LIKELY(expression) (expression)
|
|
#define OPAL_UNLIKELY(expression) (expression)
|
|
#endif
|
|
|
|
#if OMPI_CXX_HAVE_BUILTIN_PREFETCH
|
|
#define OPAL_PREFETCH(address,rw,locality) __builtin_prefetch(address,rw,locality)
|
|
#else
|
|
#define OPAL_PREFETCH(address,rw,locality)
|
|
#endif
|
|
|
|
#else
|
|
/* C code */
|
|
|
|
#if OMPI_C_HAVE_BUILTIN_EXPECT
|
|
#define OPAL_LIKELY(expression) __builtin_expect(!!(expression), 1)
|
|
#define OPAL_UNLIKELY(expression) __builtin_expect(!!(expression), 0)
|
|
#else
|
|
#define OPAL_LIKELY(expression) (expression)
|
|
#define OPAL_UNLIKELY(expression) (expression)
|
|
#endif
|
|
|
|
#if OMPI_C_HAVE_BUILTIN_PREFETCH
|
|
#define OPAL_PREFETCH(address,rw,locality) __builtin_prefetch(address,rw,locality)
|
|
#else
|
|
#define OPAL_PREFETCH(address,rw,locality)
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#endif
|