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38 lines
755 B
C
38 lines
755 B
C
// Copyright (c) 2016 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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/** Functions for measurement of CPU cycles */
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#ifndef H_PERF
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#define H_PERF
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#include <stdint.h>
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#if defined(__i386__)
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static inline uint64_t perf_cpucycles(void)
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{
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uint64_t 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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#elif defined(__x86_64__)
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static inline uint64_t perf_cpucycles(void)
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{
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uint32_t hi, lo;
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__asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
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return ((uint64_t)lo)|(((uint64_t)hi)<<32);
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}
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#else
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uint64_t perf_cpucycles(void);
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#endif
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void perf_init(void);
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void perf_fini(void);
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#endif // H_PERF
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