75 lines
1.8 KiB
C
Executable File
75 lines
1.8 KiB
C
Executable File
/*
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This program is part of the TACLeBench benchmark suite.
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Version V 1.x
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Name: memcpy.c
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Author: Torbjorn Granlund
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NIST Secure Hash Algorithm
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Copy memory to memory until the specified number of bytes
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has been copied. Overlap is NOT handled correctly.
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Source: GNU C Library
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Changes: no major functional changes
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License: Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc.
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*/
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#include "memcpy.h"
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void *sha_glibc_memcpy( void *dstpp, const void *srcpp, size_t len )
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{
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unsigned long int dstp = ( long int ) dstpp;
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unsigned long int srcp = ( long int ) srcpp;
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size_t __nbytes;
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/* Copy from the beginning to the end. */
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/* If there not too few bytes to copy, use word copy. */
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if ( len >= OP_T_THRES ) {
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/* Copy just a few bytes to make DSTP aligned. */
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len -= ( -dstp ) % OPSIZ;
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__nbytes = ( -dstp ) % OPSIZ;
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_Pragma( "loopbound min 0 max 0" )
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while ( __nbytes > 0 ) {
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BYTE __x = ( ( BYTE * ) srcp )[ 0 ];
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srcp += 1;
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__nbytes -= 1;
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( ( BYTE * ) dstp )[ 0 ] = __x;
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dstp += 1;
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}
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/* Copy whole pages from SRCP to DSTP by virtual address manipulation,
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as much as possible. */
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PAGE_COPY_FWD_MAYBE ( dstp, srcp, len, len );
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/* Copy from SRCP to DSTP taking advantage of the known alignment of
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DSTP. Number of bytes remaining is put in the third argument,
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i.e. in LEN. This number may vary from machine to machine. */
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WORD_COPY_FWD ( dstp, srcp, len, len );
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/* Fall out and copy the tail. */
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}
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/* There are just a few bytes to copy. Use byte memory operations. */
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__nbytes = len;
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_Pragma( "loopbound min 0 max 7" )
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while ( __nbytes > 0 ) {
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BYTE __x = ( ( BYTE * ) srcp )[ 0 ];
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srcp += 1;
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__nbytes -= 1;
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( ( BYTE * ) dstp )[ 0 ] = __x;
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dstp += 1;
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}
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return dstpp;
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}
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