167 lines
4.5 KiB
C
167 lines
4.5 KiB
C
/**
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* @file llfasttimer.h
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* @brief Inline implementations of fast timers.
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*
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* $LicenseInfo:firstyear=2004&license=viewergpl$
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*
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* Copyright (c) 2004-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_FASTTIMER_H
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#define LL_FASTTIMER_H
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// pull in the actual class definition
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#include "llfasttimer_class.h"
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#if LL_WINDOWS
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//
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// Windows implementation of CPU clock
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//
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//
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// NOTE: put back in when we aren't using platform sdk anymore
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//
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// because MS has different signatures for these functions in winnt.h
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// need to rename them to avoid conflicts
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//#define _interlockedbittestandset _renamed_interlockedbittestandset
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//#define _interlockedbittestandreset _renamed_interlockedbittestandreset
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//#include <intrin.h>
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//#undef _interlockedbittestandset
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//#undef _interlockedbittestandreset
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//inline U32 LLFastTimer::getCPUClockCount32()
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//{
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// U64 time_stamp = __rdtsc();
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// return (U32)(time_stamp >> 8);
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//}
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//
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//// return full timer value, *not* shifted by 8 bits
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//inline U64 LLFastTimer::getCPUClockCount64()
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//{
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// return __rdtsc();
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//}
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// shift off lower 8 bits for lower resolution but longer term timing
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// on 1Ghz machine, a 32-bit word will hold ~1000 seconds of timing
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inline U32 LLFastTimer::getCPUClockCount32()
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{
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U32 ret_val;
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__asm
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{
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_emit 0x0f
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_emit 0x31
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shr eax,8
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shl edx,24
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or eax, edx
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mov dword ptr [ret_val], eax
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}
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return ret_val;
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}
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// return full timer value, *not* shifted by 8 bits
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inline U64 LLFastTimer::getCPUClockCount64()
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{
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U64 ret_val;
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__asm
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{
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_emit 0x0f
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_emit 0x31
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mov eax,eax
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mov edx,edx
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mov dword ptr [ret_val+4], edx
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mov dword ptr [ret_val], eax
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}
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return ret_val;
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}
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#endif
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#if LL_LINUX || LL_SOLARIS
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//
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// Linux and Solaris implementation of CPU clock - all architectures.
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//
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// Try to use the MONOTONIC clock if available, this is a constant time counter
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// with nanosecond resolution (but not necessarily accuracy) and attempts are made
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// to synchronize this value between cores at kernel start. It should not be affected
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// by CPU frequency. If not available use the REALTIME clock, but this may be affected by
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// NTP adjustments or other user activity affecting the system time.
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inline U64 LLFastTimer::getCPUClockCount64()
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{
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struct timespec tp;
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#ifdef CLOCK_MONOTONIC // MONOTONIC supported at build-time?
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if (-1 == clock_gettime(CLOCK_MONOTONIC,&tp)) // if MONOTONIC isn't supported at runtime then ouch, try REALTIME
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#endif
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clock_gettime(CLOCK_REALTIME,&tp);
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return (tp.tv_sec*LLFastTimer::sClockResolution)+tp.tv_nsec;
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}
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inline U32 LLFastTimer::getCPUClockCount32()
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{
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return (U32)(LLFastTimer::getCPUClockCount64() >> 8);
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}
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#endif // (LL_LINUX || LL_SOLARIS))
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#if (LL_DARWIN) && (defined(__i386__) || defined(__amd64__))
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//
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// Mac x86 implementation of CPU clock
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inline U32 LLFastTimer::getCPUClockCount32()
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{
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U64 x;
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__asm__ volatile (".byte 0x0f, 0x31": "=A"(x));
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return (U32)(x >> 8);
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}
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inline U64 LLFastTimer::getCPUClockCount64()
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{
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U64 x;
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__asm__ volatile (".byte 0x0f, 0x31": "=A"(x));
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return x;
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}
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#endif
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#if ( LL_DARWIN && !(defined(__i386__) || defined(__amd64__)))
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//
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// Mac PPC (deprecated) implementation of CPU clock
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//
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// Just use gettimeofday implementation for now
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inline U32 LLFastTimer::getCPUClockCount32()
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{
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return (U32)(get_clock_count()>>8);
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}
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inline U64 LLFastTimer::getCPUClockCount64()
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{
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return get_clock_count();
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}
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#endif
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#endif // LL_LLFASTTIMER_H
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