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// Copyright (c) 2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
/** Functions for measurement of CPU cycles */
#ifndef BITCOIN_BENCH_PERF_H
#define BITCOIN_BENCH_PERF_H
#include <stdint.h>
#if defined(__i386__)
static inline uint64_t perf_cpucycles(void)
{
uint64_t x;
__asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));
return x;
}
#elif defined(__x86_64__)
static inline uint64_t perf_cpucycles(void)
{
uint32_t hi, lo;
__asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
return ((uint64_t)lo)|(((uint64_t)hi)<<32);
}
#else
uint64_t perf_cpucycles(void);
#endif
void perf_init(void);
void perf_fini(void);
#endif // BITCOIN_BENCH_PERF_H
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