144 lines
6.9 KiB
NASM
144 lines
6.9 KiB
NASM
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;*****************************************************************************
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;*
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;* Open Watcom Project
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;*
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;* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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;*
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;* ========================================================================
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;*
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;* This file contains Original Code and/or Modifications of Original
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;* Code as defined in and that are subject to the Sybase Open Watcom
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;* Public License version 1.0 (the 'License'). You may not use this file
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;* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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;* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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;* provided with the Original Code and Modifications, and is also
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;* available at www.sybase.com/developer/opensource.
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;*
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;* The Original Code and all software distributed under the License are
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;* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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;* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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;* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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;* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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;* NON-INFRINGEMENT. Please see the License for the specific language
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;* governing rights and limitations under the License.
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;*
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;* ========================================================================
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;*
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;* Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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;* DESCRIBE IT HERE!
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;*
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;*****************************************************************************
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;
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; __STOSB( char *EAX, int EDX, unsigned ECX );
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; __STOSD( char *EAX, int EDX, unsigned ECX );
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;
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include mdef.inc
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include struct.inc
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modstart __stos,para
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xdefp __STOSB
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xdefp __STOSD
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defpe __STOSB
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or ECX,ECX ; if length not zero
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_if ne ; then
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cmp [EAX],DL ; - access cache line
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_loop ; - loop (get onto 4-byte boundary)
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test AL,3 ; - - quit if on 4-byte boundary
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_quif e ; - - ...
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mov [EAX],DL ; - - store byte
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inc EAX ; - - increment address
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ror EDX,8 ; - - (DH can be different from DL)
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dec ECX ; - - decrement length
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_until e ; - until done
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push ECX ; - save length
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shr ECX,2 ; - calculate number of dwords
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call __STOSD ; - store dwords
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pop ECX ; - restore length
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_guess ; - guess: some bytes left to do
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and ECX,3 ; - - calculate number of bytes left
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_quif e ; - - quit if done
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mov [EAX],DL ; - - store a byte
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dec ECX ; - - decrement length
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_quif e ; - - quit if done
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mov 1[EAX],DH ; - - store a byte
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dec ECX ; - - decrement length
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_quif e ; - - quit if done
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mov 2[EAX],DL ; - - store a byte
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_endguess ; - endguess
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_endif ; endif
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ret ; return
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endproc __STOSB
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nop
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nop
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nop
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nop
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nop
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nop
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defpe __STOSD
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or ECX,ECX ; if length not zero
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_if ne ; then
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_loop ; - loop (get onto 32-byte boundary)
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test AL,1Fh ; - - quit if on 32-byte boundary
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_quif e ; - - ...
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mov [EAX],EDX ; - - store dword
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lea EAX,4[EAX] ; - - increment address
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dec ECX ; - - decrement length
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_until e ; - until done
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push ECX ; - save length
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shr ECX,2 ; - calculate number of paragraphs
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_if ne ; - if at least one paragraph
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dec ECX ; - - decrement # of paragraphs
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_if ne ; - - if still have paragraphs to do
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_loop ; - - - loop
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mov [EAX],EDX ; - - - - store dword
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mov 4[EAX],EDX ; - - - - ...
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dec ECX ; - - - - decrement count
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mov 8[EAX],EDX ; - - - - store dword
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mov 12[EAX],EDX ; - - - - ...
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je short add16 ; - - - - quit if done
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cmp 32[EAX],DL ; - - - - access next cache line
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mov 16[EAX],EDX ; - - - - store dword
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mov 20[EAX],EDX ; - - - - ...
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dec ECX ; - - - - decrement count
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mov 24[EAX],EDX ; - - - - store dword
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mov 28[EAX],EDX ; - - - - ...
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lea EAX,32[EAX] ; - - - - advance to next 32-byte chunk
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_until e ; - - - until done
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lea EAX,-16[EAX] ; - - - back up 16
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add16: lea EAX,16[EAX] ; - - - advance 16
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_endif ; - - endif
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mov [EAX],EDX ; - - fill last full paragraph
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mov 4[EAX],EDX ; - - ...
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mov 8[EAX],EDX ; - - ...
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mov 12[EAX],EDX ; - - ...
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lea EAX,16[EAX] ; - - advance pointer
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_endif ; - endif
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pop ECX ; - restore length
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_guess ; - guess: some dwords left to do
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and ECX,3 ; - - calculate number of dwords left
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_quif e ; - - quit if done
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mov [EAX],EDX ; - - store dword
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lea EAX,4[EAX] ; - - advance pointer
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dec ECX ; - - decrement length
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_quif e ; - - quit if done
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mov [EAX],EDX ; - - store dword
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lea EAX,4[EAX] ; - - advance pointer
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dec ECX ; - - decrement length
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_quif e ; - - quit if done
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mov [EAX],EDX ; - - store dword
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lea EAX,4[EAX] ; - - advance pointer
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_endguess ; - endguess
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_endif ; endif
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ret ; return
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endproc __STOSD
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endmod
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end
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