mirror of https://github.com/mpv-player/mpv
38 lines
896 B
C
38 lines
896 B
C
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/*
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fastmemcpybench.c used to benchmark fastmemcpy.h code from libvo.
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Note: this code can not be used on PentMMX-PII because they contain
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a bug in rdtsc. For Intel processors since P6(PII) rdpmc should be used
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instead. For PIII it's disputable and seems bug was fixed but I don't
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tested it.
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*/
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#include <stdio.h>
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#include "../libvo/fastmemcpy.h"
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#define ARR_SIZE 100000
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//#define ARR_SIZE 1000000
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static inline unsigned long long int read_tsc( void )
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{
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unsigned long long int retval;
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__asm __volatile ("rdtsc":"=A"(retval)::"memory");
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return retval;
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}
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unsigned char arr1[ARR_SIZE],arr2[ARR_SIZE];
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int main( void )
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{
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unsigned long long int v1,v2;
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unsigned char * marr1,*marr2;
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marr1 = &arr1[1];
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marr2 = &arr2[3];
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v1 = read_tsc();
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memcpy(marr1,marr2,ARR_SIZE-4);
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v2 = read_tsc();
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printf("v1 = %llu v2 = %llu v2-v1=%llu\n",v1,v2,v2-v1);
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return 0;
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}
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