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84 lines
2.9 KiB
84 lines
2.9 KiB
/*
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* Copyright (C) 2007 iptelorg GmbH
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*!
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* \file
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* \brief Kamailio core :: Compiler specific optimizations
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* \see \ref CompilerOptions
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* \auth Andrei
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*
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* \ingroup core
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* Module: \ref core
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*
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* \page CompilerOptions compiler specific optimizations:
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*
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\verbatim
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* - likely(expr) - branch predicition optimization - is more likely
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* that expr value will be 1 so optimize for this
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* case.
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* Example: if (likely(p!=NULL)) {... }
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* - unlikely(expr) - branch prediction optimization - is unlikely that
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* expr will be true, so optimize for this case
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* - prefetch(addr) - will prefetch addr. for reading
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* - prefetch_w(addr) - will prefetch addr. for writing
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* - prefetch_loc_r(addr, loc) - prefetch for reading, data at addr has
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* no temporal locality (loc==0), a short
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* degree of temporal locality (loc==1),
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* moderate (loc==2) or high (loc==3).
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* prefetch(addr) is equiv. to
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* prefetch_loc_r(addr, 3).
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* prefetch_loc_w(addr, loc) - like above but for writing.
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\endverbatim
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*/
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#ifndef __compiler_opt_h
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#define __compiler_opt_h
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/* likely/unlikely */
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#if __GNUC__ >= 3
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#define likely(expr) __builtin_expect(!!(expr), 1)
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#define unlikely(expr) __builtin_expect(!!(expr), 0)
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#else /* __GNUC__ */
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/* #warning "No compiler optimizations supported try gcc 4.x" */
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#define likely(expr) (expr)
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#define unlikely(expr) (expr)
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#endif /* __GNUC__ */
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/* prefetch* */
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#if ( __GNUC__ > 3 ) || ( __GNUC__ == 3 && __GNUC_MINOR__ >= 1 )
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#define prefetch(addr) __builtin_prefetch((addr))
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#define prefetch_w(addr) __builtin_prefetch((addr), 1)
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#define prefetch_loc_r(addr, loc) __builtin_prefetch((addr), 0, (loc))
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#define prefetch_loc_w(addr, loc) __builtin_prefetch((addr), 1, (loc))
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#else
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#define prefetch(addr)
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#define prefetch_w(addr)
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#define prefetch_loc_r(addr, loc)
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#define prefetch_loc_w(addr, loc)
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#endif /* __GNUC__ > 3 || ( __GNUC__ == 3 && __GNUC_MINOR__ >= 1 ) */
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#endif
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