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101 lines
2.3 KiB
C++
Executable file
101 lines
2.3 KiB
C++
Executable file
#ifndef timer_h
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#define timer_h
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#include <iostream>
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class timer {
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public:
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timer(const char *name = 0);
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timer(const char *name, std::ostream &write_on_exit);
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~timer();
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void start(), stop();
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void reset();
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std::ostream &print(std::ostream &);
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double getTimeInSeconds();
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private:
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void print_time(std::ostream &, const char *which, double time) const;
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union {
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long long total_time;
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struct {
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#if defined __PPC__
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int high, low;
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#else
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int low, high;
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#endif
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};
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};
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unsigned long long count;
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const char *const name;
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std::ostream *const write_on_exit;
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static double CPU_speed_in_MHz, get_CPU_speed_in_MHz();
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};
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std::ostream &operator<<(std::ostream &, class timer &);
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inline void timer::reset() {
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total_time = 0;
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count = 0;
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}
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inline timer::timer(const char *name) : name(name), write_on_exit(0) {
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reset();
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}
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inline timer::timer(const char *name, std::ostream &write_on_exit)
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: name(name), write_on_exit(&write_on_exit) {
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reset();
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}
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inline timer::~timer() {
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if (write_on_exit != 0)
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print(*write_on_exit);
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}
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inline void timer::start() {
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#if (defined __PATHSCALE__) && (defined __i386 || defined __x86_64)
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unsigned eax, edx;
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asm volatile("rdtsc" : "=a"(eax), "=d"(edx));
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total_time -= ((unsigned long long)edx << 32) + eax;
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#elif (defined __GNUC__ || defined __INTEL_COMPILER) && \
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(defined __i386 || defined __x86_64)
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asm volatile("rdtsc\n\t"
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"subl %%eax, %0\n\t"
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"sbbl %%edx, %1"
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: "+m"(low), "+m"(high)
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:
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: "eax", "edx");
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#else
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#error Compiler/Architecture not recognized
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#endif
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}
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inline void timer::stop() {
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#if (defined __PATHSCALE__) && (defined __i386 || defined __x86_64)
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unsigned eax, edx;
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asm volatile("rdtsc" : "=a"(eax), "=d"(edx));
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total_time += ((unsigned long long)edx << 32) + eax;
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#elif (defined __GNUC__ || defined __INTEL_COMPILER) && \
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(defined __i386 || defined __x86_64)
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asm volatile("rdtsc\n\t"
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"addl %%eax, %0\n\t"
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"adcl %%edx, %1"
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: "+m"(low), "+m"(high)
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:
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: "eax", "edx");
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#endif
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++count;
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}
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#endif
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