test for rdtsc

measure/clock_measure.c

@@ -0,0 +1,49 @@
+/*
+ * not usable clock() isn't precise enough
+ *
+ *
+ */
+#include<stdio.h>
+#include <stdint.h>
+#include<time.h>
+#include<stdlib.h>
+
+void usage_and_exit();
+
+int main(int argc, char* argv[]) {
+	if(argc != 4) usage_and_exit();
+
+	uint64_t t0, t1;
+	int a, b;
+	sscanf(argv[2], "%d", &a);
+	sscanf(argv[3], "%d", &b);
+	if(argv[1][0] == 'd') {
+		double out;
+		t0 = (uint64_t) clock();
+		out = (double) a / b;
+		t1 = (uint64_t) clock();
+		printf("out = %lf\n", out);
+	} else if(argv[1][0] == 'f') {
+		float out;
+		t0 = (uint64_t) clock();
+		out = (float) a / b;
+		t1 = (uint64_t) clock();
+		printf("out = %f\n", out);
+	} else if(argv[1][0] == 'i') {
+		int out;
+		t0 = (uint64_t) clock();
+		out = a / b;
+		t1 = (uint64_t) clock();
+		printf("out = %d\n", out);
+	} else {
+		usage_and_exit();
+	}
+	printf("clocks = %lu\n", t1 - t0);
+}
+void usage_and_exit() {
+	printf("<prog> <i|f|d> <a> <b>\n");
+	printf("i = integer\n");
+	printf("f = float\n");
+	printf("d = double\n");
+	exit(1);
+}

measure/measure.c

@@ -0,0 +1,67 @@
+#include<stdio.h>
+#ifdef _WIN32
+#include <intrin.h>
+#else
+#include <x86intrin.h>
+#endif
+
+#include <stdint.h>
+
+//  Windows
+#ifdef _WIN32
+
+#include <intrin.h>
+uint64_t rdtsc(){
+    return __rdtsc();
+}
+//  Linux/GCC
+#else
+
+uint64_t rdtsc(){
+    unsigned int lo,hi;
+    __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
+    return ((uint64_t)hi << 32) | lo;
+}
+#endif
+
+void usage_and_exit();
+
+int main(int argc, char* argv[]) {
+	if(argc != 4) usage_and_exit();
+
+	uint64_t t0, t1;
+	int a, b;
+	sscanf(argv[2], "%d", &a);
+	sscanf(argv[3], "%d", &b);
+	if(argv[1][0] == 'x') {
+		printf("filler found\n");
+	} else if(argv[1][0] == 'i') {
+		int out;
+		t0 = rdtsc();
+		out = a + b;
+		t1 = rdtsc();
+		printf("out = %d\n", out);
+	} else if(argv[1][0] == 'f') {
+		float out;
+		t0 = rdtsc();
+		out = (float) a + b;
+		t1 = rdtsc();
+		printf("out = %f\n", out);
+	} else if(argv[1][0] == 'd') {
+		double out;
+		t0 = rdtsc();
+		out = (double) a + b;
+		t1 = rdtsc();
+		printf("out = %lf\n", out);
+	} else {
+		usage_and_exit();
+	}
+	printf("clocks = %lu\n", t1 - t0);
+}
+void usage_and_exit() {
+	printf("<prog> <i|f|d> <a> <b>\n");
+	printf("i = integer\n");
+	printf("f = float\n");
+	printf("d = double\n");
+	exit(1);
+}