forked from OSchip/llvm-project
45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
#include "timing.h"
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#include <stdio.h>
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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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double __floatundidf(uint64_t x);
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int main(int argc, char *argv[]) {
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#define INPUT_SIZE 512
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uint64_t input[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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input[i] = (((uint64_t)rand() << 32) | (uint64_t)rand()) >> (rand() & 63);
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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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__floatundidf(input[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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