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	util.h - libzahl - big integer library
	git clone git://git.suckless.org/libzahl
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	---
	util.h (2543B)
	---
	1 #if defined(__linux__)
	2 # define _GNU_SOURCE
	3 # include <sched.h>
	4 #endif
	5
	6 #include <limits.h>
	7 #include <stdio.h>
	8 #include <stdlib.h>
	9 #include <string.h>
	10 #include <time.h>
	11 #include <unistd.h>
	12
	13
	14
	15 #ifdef BENCHMARK_LIB
	16 # include BENCHMARK_LIB
	17 #else
	18 # include "../zahl.h"
	19 # define BIGINT_LIBRARY "libzahl"
	20 #endif
	21
	22 #ifndef LIBRARY_SUFFIX
	23 # define LIBRARY_SUFFIX ""
	24 #endif
	25
	26 #ifndef USE_CPU
	27 # define USE_CPU 0
	28 #endif
	29
	30
	31 #ifndef CLOCK_MONOTONIC_RAW
	32 # define CLOCK_MONOTONIC_RAW CLOCK_MONOTONIC
	33 #endif
	34
	35 #ifdef __x86_64__
	36 # define RDTSC_MAYBE_SUPPORTED
	37 #endif
	38
	39 #if !defined(USE_RDTSC) && !defined(USE_CLOCK) && !defined(USE_GETTIME)
	40 # if 1 && defined(RDTSC_MAYBE_SUPPORTED) && defined(__linux__)
	41 # define USE_RDTSC
	42 # elif 1
	43 # define USE_CLOCK
	44 # else
	45 # define USE_GETTIME
	46 # endif
	47 #endif
	48
	49
	50
	51 extern char timebuf[512];
	52 extern unsigned long long int freq;
	53
	54 #ifndef COMPILING_UTIL_C
	55
	56 static struct timespec dur;
	57
	58 # if defined(USE_RDTSC) && defined(__x86_64__)
	59 typedef unsigned long long int rdtsc_t;
	60 static unsigned int start_high, start_low, end_high, end_low;
	61 # define rdtsc_join(low, high) ((rdtsc_t)(low) \| (((rdtsc_t)(high)) <…
	62 # define TIC (rdtsc(&start_low, &start_high))
	63 # define TOC\
	64 do {\
	65 rdtsc_t dur_cycles;\
	66 double dur_seconds;\
	67 rdtsc(&end_low, &end_high);\
	68 dur_cycles = rdtsc_join(end_low, end_high);\
	69 dur_cycles -= rdtsc_join(start_low, start_high);\
	70 dur_seconds = (double)dur_cycles;\
	71 dur_seconds /= 1000 * (double)freq;\
	72 dur_seconds -= (double)(dur.tv_sec = (int)dur_seconds);\
	73 dur.tv_nsec = (long int)(dur_seconds * 1000000000L);\
	74 } while (0)
	75 static inline void
	76 rdtsc(unsigned int low, unsigned int high)
	77 {
	78 __asm__ __volatile__ ("rdtsc" : "=a"(low), "=d"(high));
	79 }
	80
	81 # elif defined(USE_CLOCK)
	82 static clock_t start, end;
	83 # define TIC (start = clock())
	84 # define TOC\
	85 do {\
	86 end = clock();\
	87 dur.tv_sec = (end - start) / 1000000ULL;\
	88 dur.tv_nsec = ((end - start) % 1000000ULL) * 1000;\
	89 } while (0)
	90
	91 # elif defined(USE_GETTIME)
	92 static struct timespec start;
	93 # define TIC clock_gettime(CLOCK_MONOTONIC_RAW, &start)
	94 # define TOC\
	95 do {\
	96 clock_gettime(CLOCK_MONOTONIC_RAW, &dur);\
	97 dur.tv_sec -= start.tv_sec;\
	98 dur.tv_nsec -= start.tv_nsec;\
	99 if (dur.tv_nsec < 0) {\
	100 dur.tv_nsec += 1000000000L;\
	101 dur.tv_sec -= 1;\
	102 }\
	103 } while (0)
	104
	105 # endif
	106
	107
	108 # define TICKS ((unsigned long long int)(dur.tv_sec) * 1000000000ULL + …
	109 # define STIME (sprintf(timebuf, "%lli.%09li", (long long)(dur.tv_sec),…
	110
	111 #endif
	112
	113
	114 void benchmark_init(void);