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// gives access to the Pentium's (secret) cycle counter
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// This software was written by Leonard Janke (janke@unixg.ubc.ca)
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// in 1996-7 and is entered, by him, into the public domain.
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#if defined(__WATCOMC__)
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void GetTSC(unsigned long&);
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#pragma aux GetTSC = 0x0f 0x31 "mov [edi], eax" parm [edi] modify [edx eax];
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#elif defined(__GNUC__)
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void GetTSC(unsigned long& tsc)
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asm volatile(".byte 15, 49\n\t"
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#elif defined(_MSC_VER)
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void GetTSC(unsigned long& tsc)
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#include <openssl/sha.h>
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#define sha1_block_x86 sha1_block_asm_data_order
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void sha1_block_x86(SHA_CTX *ctx, unsigned char *buffer,int num);
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void main(int argc,char *argv[])
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unsigned char buffer[64*256];
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unsigned long s1,s2,e1,e2;
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unsigned long data[2];
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if (num > 250) num=16;
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for (i=0; i<10; i++) /**/
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sha1_block_x86(&ctx,buffer,numm);
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sha1_block_x86(&ctx,buffer,numm);
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sha1_block_x86(&ctx,buffer,num);
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sha1_block_x86(&ctx,buffer,num);
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printf("sha1 (%d bytes) %d %d (%.2f)\n",num*64,
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e1-s1,e2-s2,(double)((e1-s1)-(e2-s2))/2);