72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
/*
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Copyright (c) 2010-2011, Intel Corporation
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Intel Corporation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdint.h>
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#ifdef WIN32
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#include <windows.h>
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#define rdtsc __rdtsc
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#else
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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__inline__ uint64_t rdtsc() {
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uint32_t low, high;
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__asm__ __volatile__ (
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"xorl %%eax,%%eax \n cpuid"
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::: "%rax", "%rbx", "%rcx", "%rdx" );
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__asm__ __volatile__ (
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"rdtsc" : "=a" (low), "=d" (high));
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return (uint64_t)high << 32 | low;
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}
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif
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static uint64_t start, end;
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static inline void reset_and_start_timer()
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{
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start = rdtsc();
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}
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/* Returns the number of millions of elapsed processor cycles since the
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last reset_and_start_timer() call. */
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static inline double get_elapsed_mcycles()
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{
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end = rdtsc();
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return (end-start) / (1024. * 1024.);
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}
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