53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
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#include "timing.h"
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#include <stdio.h>
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#define INPUT_TYPE int64_t
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#define INPUT_SIZE 256
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#define FUNCTION_NAME __muldi3
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#ifndef LIBNAME
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#define LIBNAME UNKNOWN
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#endif
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#define LIBSTRING LIBSTRINGX(LIBNAME)
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#define LIBSTRINGX(a) LIBSTRINGXX(a)
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#define LIBSTRINGXX(a) #a
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INPUT_TYPE FUNCTION_NAME(INPUT_TYPE input1, INPUT_TYPE input2);
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int main(int argc, char *argv[]) {
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INPUT_TYPE input1[INPUT_SIZE];
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INPUT_TYPE input2[INPUT_SIZE];
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int i, j;
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srand(42);
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// Initialize the input array with data of various sizes.
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for (i=0; i<INPUT_SIZE; ++i) {
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input1[i] = (((int64_t)rand() << 36) | (uint64_t)rand()) >> (rand() & 63);
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input2[i] = (((int64_t)rand() << 36) | (uint64_t)rand()) >> (rand() & 63);
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}
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int64_t fixedInput = INT64_C(0x1234567890ABCDEF);
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double bestTime = __builtin_inf();
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void *dummyp;
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for (j=0; j<1024; ++j) {
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uint64_t startTime = mach_absolute_time();
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for (i=0; i<INPUT_SIZE; ++i)
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FUNCTION_NAME(input1[i], input2[i]);
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uint64_t endTime = mach_absolute_time();
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double thisTime = intervalInCycles(startTime, endTime);
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bestTime = __builtin_fmin(thisTime, bestTime);
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// Move the stack alignment between trials to eliminate (mostly) aliasing effects
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dummyp = alloca(1);
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}
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printf("%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE);
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return 0;
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}
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