Viewing file:  prefetch.h (1.41 KB) -rw-r--r--
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/*
* 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 OPAL_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 OPAL_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
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