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e603983ec9
The __builtin_expect() can be used to provide the compiler with branch
prediction information. The Gcc manual says[1] on the subject:
In general, you should prefer to use actual profile feedback for
this (-fprofile-arcs), as programmers are notoriously bad at
predicting how their programs actually perform.
Stop using __builtin_expect() and ISC_LIKELY() and ISC_UNLIKELY() macros
to provide the branch prediction information as the performance testing
shows that named performs better when the __builtin_expect() is not
being used.
1. https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005fexpect
67 lines
2 KiB
C
67 lines
2 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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/*! \file isc/assertions.h
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*/
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#pragma once
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#include <isc/attributes.h>
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#include <isc/lang.h>
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ISC_LANG_BEGINDECLS
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/*% isc assertion type */
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typedef enum {
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isc_assertiontype_require,
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isc_assertiontype_ensure,
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isc_assertiontype_insist,
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isc_assertiontype_invariant
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} isc_assertiontype_t;
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typedef void (*isc_assertioncallback_t)(const char *, int, isc_assertiontype_t,
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const char *);
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/* coverity[+kill] */
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ISC_NORETURN
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void
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isc_assertion_failed(const char *, int, isc_assertiontype_t, const char *);
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void isc_assertion_setcallback(isc_assertioncallback_t);
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const char *
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isc_assertion_typetotext(isc_assertiontype_t type);
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#define ISC_REQUIRE(cond) \
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((void)((cond) || \
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((isc_assertion_failed)(__FILE__, __LINE__, \
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isc_assertiontype_require, #cond), \
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0)))
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#define ISC_ENSURE(cond) \
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((void)((cond) || \
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((isc_assertion_failed)(__FILE__, __LINE__, \
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isc_assertiontype_ensure, #cond), \
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0)))
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#define ISC_INSIST(cond) \
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((void)((cond) || \
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((isc_assertion_failed)(__FILE__, __LINE__, \
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isc_assertiontype_insist, #cond), \
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0)))
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#define ISC_INVARIANT(cond) \
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((void)((cond) || \
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((isc_assertion_failed)(__FILE__, __LINE__, \
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isc_assertiontype_invariant, #cond), \
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0)))
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ISC_LANG_ENDDECLS
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