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#
# MMX surface clear routines for HERMES
# Copyright (c) 1998 Christian Nentwich (c.nentwich@cs.ucl.ac.uk)
# This source code is licensed under the GNU LGPL
#
# Please refer to the file COPYING.LIB contained in the distribution for
# licensing conditions
#
.globl _ClearMMX_32
.globl _ClearMMX_24
.globl _ClearMMX_16
.globl _ClearMMX_8
.text
##
## --------------------------------------------------------------------------
## HermesClearInterface (ebp+..)
## 0: char8 *dest
## 4: int32 value
## 8: unsigned int width (already checked to be >0!)
## 12: unsigned int height (already checked to be >0!)
## 16: int add
_ClearMMX_32:
pushl %ebp
movl %esp,%ebp
movl 8(%ebp),%ebp
movl 4(%ebp),%eax # pixel value
movd 4(%ebp),%mm0
movl 12(%ebp),%edx # height
movq %mm0,%mm1
psllq $32,%mm0
movl (%ebp),%edi # destination
por %mm1,%mm0
_ClearMMX_32.L_y:
movl 8(%ebp),%ecx
movl %ecx,%ebx
shrl %ecx
jz _ClearMMX_32.L_last
_ClearMMX_32.L_x:
movq %mm0,(%edi)
addl $8,%edi
decl %ecx
jnz _ClearMMX_32.L_x
_ClearMMX_32.L_last:
testl $1,%ebx
jz _ClearMMX_32.L_endline
movl %eax,(%edi)
addl $4,%edi
_ClearMMX_32.L_endline:
addl 16(%ebp),%edi
decl %edx
jnz _ClearMMX_32.L_y
emms
popl %ebp
ret
_ClearMMX_24:
ret
_ClearMMX_16:
pushl %ebp
movl %esp,%ebp
movl 8(%ebp),%ebp
movl 4(%ebp),%eax # pixel value
movl 4(%ebp),%ebx
movl 12(%ebp),%edx # height
movl (%ebp),%edi # destination
shll $16,%eax # Duplicate pixel value
andl $0x0ffff,%ebx
orl %ebx,%eax
movd %eax,%mm0
movd %eax,%mm1
psllq $32,%mm0
por %mm1,%mm0
_ClearMMX_16.L_y:
movl 8(%ebp),%ecx
testl $3,%edi # Check if destination is aligned mod 4
jz _ClearMMX_16.L_aligned
movw %ax,(%edi) # otherwise write one pixel
addl $2,%edi
decl %ecx
jz _ClearMMX_16.L_endline
_ClearMMX_16.L_aligned:
movl %ecx,%ebx
shrl $2,%ecx
jz _ClearMMX_16.L_last
_ClearMMX_16.L_x:
movq %mm0,(%edi)
addl $8,%edi
decl %ecx
jnz _ClearMMX_16.L_x
_ClearMMX_16.L_last:
andl $3,%ebx
jz _ClearMMX_16.L_endline
movw %ax,(%edi) # Write trailing pixels
addl $2,%edi
decl %ebx
jz _ClearMMX_16.L_endline
movw %ax,(%edi)
addl $2,%edi
decl %ebx
jz _ClearMMX_16.L_endline
movw %ax,(%edi)
addl $2,%edi
decl %ebx
jnz _ClearMMX_16.L_endline
_ClearMMX_16.L_endline:
addl 16(%ebp),%edi
decl %edx
jnz _ClearMMX_16.L_y
emms
popl %ebp
ret
## Clear8_x86 isnt optimised fully yet as it seems to be a tiny bit slower
## than the C routine
_ClearMMX_8:
pushl %ebp
movl %esp,%ebp
movl 8(%ebp),%ebp
movl 4(%ebp),%eax # pixel value
movl 4(%ebp),%ebx
movl 12(%ebp),%edx # height
andl $0x0ff,%ebx
shll $8,%eax # Put the byte pixel value in all four bytes
movl (%ebp),%edi # destination
movb %bl,%al
movb %bl,%bh
shll $16,%eax
movb %bh,%ah
movb %bl,%al
movd %eax,%mm0
movd %eax,%mm1
psllq $32,%mm0
por %mm1,%mm0
_ClearMMX_8.L_y:
movl 8(%ebp),%ecx
testl $3,%edi # Align mod 4
jz _ClearMMX_8.L_aligned
movl %edi,%ebx
andl $3,%ebx
movb %al,(%edi) # Unrolled (copy & paste), align and jump
incl %edi # if finished, faster than a loop...
decl %ecx
jz _ClearMMX_8.L_endline
decl %ebx
jz _ClearMMX_8.L_aligned
movb %al,(%edi) # Second pixel
incl %edi
decl %ecx
jz _ClearMMX_8.L_endline
decl %ebx
jz _ClearMMX_8.L_aligned
movb %al,(%edi) # Third pixel
incl %edi
decl %ecx
jz _ClearMMX_8.L_endline
decl %ebx
jz _ClearMMX_8.L_aligned
_ClearMMX_8.L_aligned:
movl %ecx,%ebx # Store ecx for later
shrl $3,%ecx # We write 8 pixels at once
jz _ClearMMX_8.L_last
_ClearMMX_8.L_x:
movq %mm0,(%edi)
addl $8,%edi
decl %ecx
jnz _ClearMMX_8.L_x
_ClearMMX_8.L_last:
movl %ebx,%ecx # Clean up trailing pixels
andl $7,%ecx # Could be up to 7 left
jz _ClearMMX_8.L_endline
testb $0b100,%cl # If theres less than four jump
jz _ClearMMX_8.L_lessthanfour
movl %eax,(%edi) # Otherwise write a dword
addl $4,%edi
subl $4,%ecx
_ClearMMX_8.L_lessthanfour:
rep
stosb # Clean up the very rest
_ClearMMX_8.L_endline:
addl 16(%ebp),%edi
decl %edx
jnz _ClearMMX_8.L_y
emms
popl %ebp
ret
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