57b08b0944
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
131 lines
3.6 KiB
C++
131 lines
3.6 KiB
C++
/** @file kmp_stats_timing.cpp
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* Timing functions
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*/
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include <stdlib.h>
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#include <unistd.h>
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#include <iomanip>
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#include <iostream>
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#include <sstream>
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#include "kmp.h"
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#include "kmp_stats_timing.h"
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using namespace std;
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#if KMP_HAVE_TICK_TIME
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#if KMP_MIC
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double tsc_tick_count::tick_time() {
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// pretty bad assumption of 1GHz clock for MIC
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return 1 / ((double)1000 * 1.e6);
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}
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#elif KMP_ARCH_X86 || KMP_ARCH_X86_64
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#include <string.h>
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// Extract the value from the CPUID information
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double tsc_tick_count::tick_time() {
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static double result = 0.0;
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if (result == 0.0) {
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kmp_cpuid_t cpuinfo;
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char brand[256];
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__kmp_x86_cpuid(0x80000000, 0, &cpuinfo);
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memset(brand, 0, sizeof(brand));
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int ids = cpuinfo.eax;
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for (unsigned int i = 2; i < (ids ^ 0x80000000) + 2; i++)
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__kmp_x86_cpuid(i | 0x80000000, 0,
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(kmp_cpuid_t *)(brand + (i - 2) * sizeof(kmp_cpuid_t)));
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char *start = &brand[0];
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for (; *start == ' '; start++)
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;
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char *end = brand + KMP_STRLEN(brand) - 3;
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uint64_t multiplier;
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if (*end == 'M')
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multiplier = 1000LL * 1000LL;
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else if (*end == 'G')
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multiplier = 1000LL * 1000LL * 1000LL;
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else if (*end == 'T')
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multiplier = 1000LL * 1000LL * 1000LL * 1000LL;
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else {
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cout << "Error determining multiplier '" << *end << "'\n";
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exit(-1);
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}
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*end = 0;
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while (*end != ' ')
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end--;
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end++;
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double freq = strtod(end, &start);
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if (freq == 0.0) {
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cout << "Error calculating frequency " << end << "\n";
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exit(-1);
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}
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result = ((double)1.0) / (freq * multiplier);
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}
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return result;
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}
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#endif
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#endif
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static bool useSI = true;
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// Return a formatted string after normalising the value into
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// engineering style and using a suitable unit prefix (e.g. ms, us, ns).
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std::string formatSI(double interval, int width, char unit) {
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std::stringstream os;
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if (useSI) {
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// Preserve accuracy for small numbers, since we only multiply and the
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// positive powers of ten are precisely representable.
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static struct {
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double scale;
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char prefix;
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} ranges[] = {{1.e21, 'y'}, {1.e18, 'z'}, {1.e15, 'a'}, {1.e12, 'f'},
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{1.e9, 'p'}, {1.e6, 'n'}, {1.e3, 'u'}, {1.0, 'm'},
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{1.e-3, ' '}, {1.e-6, 'k'}, {1.e-9, 'M'}, {1.e-12, 'G'},
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{1.e-15, 'T'}, {1.e-18, 'P'}, {1.e-21, 'E'}, {1.e-24, 'Z'},
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{1.e-27, 'Y'}};
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if (interval == 0.0) {
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os << std::setw(width - 3) << std::right << "0.00" << std::setw(3)
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<< unit;
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return os.str();
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}
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bool negative = false;
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if (interval < 0.0) {
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negative = true;
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interval = -interval;
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}
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for (int i = 0; i < (int)(sizeof(ranges) / sizeof(ranges[0])); i++) {
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if (interval * ranges[i].scale < 1.e0) {
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interval = interval * 1000.e0 * ranges[i].scale;
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os << std::fixed << std::setprecision(2) << std::setw(width - 3)
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<< std::right << (negative ? -interval : interval) << std::setw(2)
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<< ranges[i].prefix << std::setw(1) << unit;
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return os.str();
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}
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}
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}
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os << std::setprecision(2) << std::fixed << std::right << std::setw(width - 3)
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<< interval << std::setw(3) << unit;
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return os.str();
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}
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