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kmp_stats_timing.h
#ifndef KMP_STATS_TIMING_H
#define KMP_STATS_TIMING_H
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "kmp_os.h"
#include <limits>
#include <stdint.h>
#include <string>
#if KMP_HAVE_X86INTRIN_H
#include <x86intrin.h>
#endif
class tsc_tick_count {
private:
int64_t my_count;
public:
class tsc_interval_t {
int64_t value;
explicit tsc_interval_t(int64_t _value) : value(_value) {}
public:
tsc_interval_t() : value(0) {} // Construct 0 time duration
#if KMP_HAVE_TICK_TIME
double seconds() const; // Return the length of a time interval in seconds
#endif
double ticks() const { return double(value); }
int64_t getValue() const { return value; }
tsc_interval_t &operator=(int64_t nvalue) {
value = nvalue;
return *this;
}
friend class tsc_tick_count;
friend tsc_interval_t operator-(const tsc_tick_count &t1,
const tsc_tick_count &t0);
friend tsc_interval_t operator-(const tsc_tick_count::tsc_interval_t &i1,
const tsc_tick_count::tsc_interval_t &i0);
friend tsc_interval_t &operator+=(tsc_tick_count::tsc_interval_t &i1,
const tsc_tick_count::tsc_interval_t &i0);
};
#if KMP_HAVE___BUILTIN_READCYCLECOUNTER
tsc_tick_count()
: my_count(static_cast<int64_t>(__builtin_readcyclecounter())) {}
#elif KMP_HAVE___RDTSC
tsc_tick_count() : my_count(static_cast<int64_t>(__rdtsc())) {}
#else
#error Must have high resolution timer defined
#endif
tsc_tick_count(int64_t value) : my_count(value) {}
int64_t getValue() const { return my_count; }
tsc_tick_count later(tsc_tick_count const other) const {
return my_count > other.my_count ? (*this) : other;
}
tsc_tick_count earlier(tsc_tick_count const other) const {
return my_count < other.my_count ? (*this) : other;
}
#if KMP_HAVE_TICK_TIME
static double tick_time(); // returns seconds per cycle (period) of clock
#endif
static tsc_tick_count now() {
return tsc_tick_count();
} // returns the rdtsc register value
friend tsc_tick_count::tsc_interval_t operator-(const tsc_tick_count &t1,
const tsc_tick_count &t0);
};
inline tsc_tick_count::tsc_interval_t operator-(const tsc_tick_count &t1,
const tsc_tick_count &t0) {
return tsc_tick_count::tsc_interval_t(t1.my_count - t0.my_count);
}
inline tsc_tick_count::tsc_interval_t
operator-(const tsc_tick_count::tsc_interval_t &i1,
const tsc_tick_count::tsc_interval_t &i0) {
return tsc_tick_count::tsc_interval_t(i1.value - i0.value);
}
inline tsc_tick_count::tsc_interval_t &
operator+=(tsc_tick_count::tsc_interval_t &i1,
const tsc_tick_count::tsc_interval_t &i0) {
i1.value += i0.value;
return i1;
}
#if KMP_HAVE_TICK_TIME
inline double tsc_tick_count::tsc_interval_t::seconds() const {
return value * tick_time();
}
#endif
extern std::string formatSI(double interval, int width, char unit);
inline std::string formatSeconds(double interval, int width) {
return formatSI(interval, width, 'S');
}
inline std::string formatTicks(double interval, int width) {
return formatSI(interval, width, 'T');
}
#endif // KMP_STATS_TIMING_H