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70 lines
1.3 KiB
C++
70 lines
1.3 KiB
C++
// Matt Wells, copyright Jan 2002
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//#include "gb-include.h"
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#include <sys/time.h> // gettimeofday()
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#include <stdio.h>
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int64_t gettod ( ) {
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struct timeval tv;
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gettimeofday ( &tv , 0 );
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int64_t now=(int64_t)(tv.tv_usec/1000)+((int64_t)tv.tv_sec)*1000;
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return now;
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}
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int main ( int argc , char *argv[] ) {
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float x= 0.4598;
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float y = 13.4567;
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printf("start float loop\n");
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float z;
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int64_t start = gettod();
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for ( int32_t i = 0 ; i < 10000000 ; i++ )
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z = x * y;
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int64_t end = gettod();
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printf("float muls took %"INT64"ms\n",end-start);
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int32_t xi = 14598;
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int32_t yi = 134567;
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int32_t zi;
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start = gettod();
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for ( int32_t i = 0 ; i < 10000000 ; i++ )
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zi = xi * yi;
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end = gettod();
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printf("int muls took %"INT64"ms\n",end-start);
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start = gettod();
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for ( int32_t i = 0 ; i < 10000000 ; i++ )
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z = x + y;
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end = gettod();
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printf("float adds took %"INT64"ms\n",end-start);
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start = gettod();
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for ( int32_t i = 0 ; i < 10000000 ; i++ )
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zi = xi + yi;
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end = gettod();
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printf("int adds took %"INT64"ms\n",end-start);
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start = gettod();
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for ( int32_t i = 0 ; i < 10000000 ; i++ )
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z = x / y;
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end = gettod();
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printf("float divs took %"INT64"ms\n",end-start);
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start = gettod();
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for ( int32_t i = 0 ; i < 10000000 ; i++ )
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zi = xi / yi;
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end = gettod();
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printf("int divs took %"INT64"ms\n",end-start);
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return 0;
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}
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