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/* $XFree86: xc/programs/Xserver/hw/xfree86/vgafb/enhanced/fLineBres.s,v 1.2 1998/07/25 16:58:29 dawes Exp $ */
/* Copyright 1992 by James Tsillas, Arlington, Massachusetts.
All Rights Reserved
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation.
JAMES TSILLAS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
EVENT SHALL DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
*/
/* $XConsortium: fLineBres.s /main/5 1996/02/21 18:08:50 kaleb $ */
#include "assyntax.h"
#include "vgaAsm.h"
FILE("fLineBres.s")
AS_BEGIN
#define rop REGOFF(8,EBP)
#define andv DH
#define xorv DL
#define addrl REGOFF(20,EBP)
#define nlwidth REGOFF(24,EBP)
#define signdx REGOFF(28,EBP)
#define signdy REGOFF(32,EBP)
#define axis REGOFF(36,EBP)
#define x1 REGOFF(40,EBP)
#define y1 REGOFF(44,EBP)
#define e EDI
#define e1 ESI
#define e2 REGOFF(56,EBP)
#define len ECX
#define addrb EBX
#define tmp EAX
#define GXcopy CONST(3)
#define Y_AXIS CONST(1)
SEG_DATA
ALIGNDATA4
e3:
D_LONG 0
SEG_TEXT
ALIGNTEXT4
GLOBL GLNAME(fastvga256BresS)
GLNAME(fastvga256BresS):
PUSH_L (EBP)
MOV_L (ESP,EBP)
PUSH_L (EDI)
PUSH_L (ESI)
PUSH_L (EBX)
MOV_L (REGOFF(60,EBP),len)
CMP_L (CONST(0),len) /* check for zero length first */
JZ (.allfinish)
MOV_B (REGOFF(12,EBP),andv)
MOV_B (REGOFF(16,EBP),xorv)
MOV_L (REGOFF(48,EBP),e)
MOV_L (REGOFF(52,EBP),e1)
MOV_L (e2,tmp)
SUB_L (e1,tmp)
MOV_L (tmp,CONTENT(e3))
SHL_L (CONST(2),nlwidth)
MOV_L (nlwidth,tmp)
IMUL_L (y1,tmp)
ADD_L (x1,tmp)
ADD_L (addrl,tmp)
MOV_L (tmp,addrb)
CMP_L (CONST(0),signdy)
JGE (.L1)
NEG_L (nlwidth)
.L1: SUB_L (e1,e)
CMP_L (Y_AXIS,axis)
JNZ (.L2)
PUSH_L (nlwidth)
PUSH_L (signdx)
POP_L (nlwidth)
POP_L (signdx)
.L2: CMP_L (GXcopy,rop)
JNZ (.LSet)
.LCopy: CMP_L (VGABASE,addrl)
JB (.nocheckloopC)
PUSH_L (addrb)
CALL (GLNAME(vgaSetWrite))
MOV_L (tmp,addrb)
ADD_L (CONST(4),ESP)
ALIGNTEXT4ifNOP
.writeloopC:
MOV_B (xorv,REGIND(addrb))
ADD_L (e1,e)
JS (.L3)
ADD_L (nlwidth,addrb)
ADD_L (CONTENT(e3),e)
.L3: ADD_L (signdx,addrb)
CMP_L (CONTENT(GLNAME(vgaWriteBottom)),addrb)
/* was JBE */
JB (.L4)
CMP_L (CONTENT(GLNAME(vgaWriteTop)),addrb)
JAE (.L9)
DEC_L (ECX)
JNZ (.writeloopC)
JMP (.allfinish)
.L9: PUSH_L (addrb)
CALL (GLNAME(vgaWriteNext))
MOV_L (tmp,addrb)
ADD_L (CONST(4),ESP)
DEC_L (ECX)
JNZ (.writeloopC)
JMP (.allfinish)
.L4: PUSH_L (addrb)
CALL (GLNAME(vgaWritePrev))
MOV_L (tmp,addrb)
ADD_L (CONST(4),ESP)
DEC_L (ECX)
JNZ (.writeloopC)
JMP (.allfinish)
ALIGNTEXT4
.nocheckloopC:
MOV_B (xorv,REGIND(addrb))
ADD_L (e1,e)
JS (.L5)
ADD_L (nlwidth,addrb)
ADD_L (CONTENT(e3),e)
.L5: ADD_L (signdx,addrb)
DEC_L (ECX)
JNZ (.nocheckloopC)
ALIGNTEXT4ifNOP
.allfinish:
POP_L (EBX)
POP_L (ESI)
POP_L (EDI)
LEAVE
RET
.LSet: CMP_L (VGABASE,addrl)
JB (.nocheckloopS)
PUSH_L (addrb)
CALL (GLNAME(vgaSetReadWrite))
MOV_L (tmp,addrb)
ADD_L (CONST(4),ESP)
ALIGNTEXT4ifNOP
.writeloopS:
MOV_B (REGIND(addrb),AL) /* Minimize slow memory access */
AND_B (andv,AL)
XOR_B (xorv,AL)
MOV_B (AL,REGIND(addrb))
ADD_L (e1,e)
JS (.L6)
ADD_L (nlwidth,addrb)
ADD_L (CONTENT(e3),e)
.L6: ADD_L (signdx,addrb)
CMP_L (CONTENT(GLNAME(vgaWriteBottom)),addrb)
/* was JBE */
JB (.L7)
CMP_L (CONTENT(GLNAME(vgaWriteTop)),addrb)
JAE (.L10)
DEC_L (ECX)
JNZ (.writeloopS)
JMP (.allfinish)
.L10: PUSH_L (addrb)
CALL (GLNAME(vgaReadWriteNext))
MOV_L (tmp,addrb)
ADD_L (CONST(4),ESP)
DEC_L (ECX)
JNZ (.writeloopS)
JMP (.allfinish)
.L7: PUSH_L (addrb)
CALL (GLNAME(vgaReadWritePrev))
MOV_L (EAX,addrb)
ADD_L (CONST(4),ESP)
DEC_L (ECX)
JNZ (.writeloopS)
JMP (.allfinish)
ALIGNTEXT4
.nocheckloopS:
MOV_B (REGIND(addrb),AL) /* Minimize slow memory access */
AND_B (andv,AL)
XOR_B (xorv,AL)
MOV_B (AL,REGIND(addrb))
ADD_L (e1,e)
JS (.L8)
ADD_L (nlwidth,addrb)
ADD_L (CONTENT(e3),e)
.L8: ADD_L (signdx,addrb)
DEC_L (ECX)
JNZ (.nocheckloopS)
JMP (.allfinish)
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