xref: /src/sys/external/bsd/compiler_rt/dist/test/timing/ashldi3.c

#include "timing.h"
#include <stdio.h>

#define INPUT_TYPE int
#define INPUT_SIZE 512
#define FUNCTION_NAME __ashldi3

#ifndef LIBNAME
#define LIBNAME UNKNOWN
#endif

#define LIBSTRING		LIBSTRINGX(LIBNAME)
#define LIBSTRINGX(a)	LIBSTRINGXX(a)
#define LIBSTRINGXX(a)	#a

int64_t FUNCTION_NAME(int64_t input, INPUT_TYPE count);

int main(int argc, char *argv[]) {
	INPUT_TYPE input[INPUT_SIZE];
	int i, j;

	srand(42);

	// Initialize the input array with data of various sizes.
	for (i=0; i<INPUT_SIZE; ++i)
		input[i] = rand() & 0x3f;

	int64_t fixedInput = INT64_C(0x1234567890ABCDEF);

	double bestTime = __builtin_inf();
	void *dummyp;
	for (j=0; j<1024; ++j) {

		uint64_t startTime = mach_absolute_time();
		for (i=0; i<INPUT_SIZE; ++i)
			FUNCTION_NAME(fixedInput, input[i]);
		uint64_t endTime = mach_absolute_time();

		double thisTime = intervalInCycles(startTime, endTime);
		bestTime = __builtin_fmin(thisTime, bestTime);

		// Move the stack alignment between trials to eliminate (mostly) aliasing effects
		dummyp = alloca(1);
	}

	printf("%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE);

	return 0;
}