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b0971e47d76fdb81270e93bbf11ff5558073350d
mozjpeg/simd/jdsample-mmx.asm
DRC 123f7258a8 Format copyright headers more consistently 
The IJG convention is to format copyright notices as:

Copyright (C) YYYY, Owner.

We try to maintain this convention for any code that is part of the
libjpeg API library (with the exception of preserving the copyright
notices from Cendio's code verbatim, since those predate
libjpeg-turbo.)

Note that the phrase "All Rights Reserved" is no longer necessary, since
all Buenos Aires Convention signatories signed onto the Berne Convention
in 2000.  However, our convention is to retain this phrase for any files
that have a self-contained copyright header but to leave it off of any
files that refer to another file for conditions of distribution and use.
For instance, all of the non-SIMD files in the libjpeg API library refer
to README.ijg, and the copyright message in that file contains "All
Rights Reserved", so it is unnecessary to add it to the individual
files.

The TurboJPEG code retains my preferred formatting convention for
copyright notices, which is based on that of VirtualGL (where the
TurboJPEG API originated.)
2016-05-28 19:16:58 -05:00

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;
; jdsample.asm - upsampling (MMX)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
;
; Based on the x86 SIMD extension for IJG JPEG library
; Copyright (C) 1999-2006, MIYASAKA Masaru.
; For conditions of distribution and use, see copyright notice in jsimdext.inc
;
; This file should be assembled with NASM (Netwide Assembler),
; can *not* be assembled with Microsoft's MASM or any compatible
; assembler (including Borland's Turbo Assembler).
; NASM is available from http://nasm.sourceforge.net/ or
; http://sourceforge.net/project/showfiles.php?group_id=6208
;
; [TAB8]
%include "jsimdext.inc"
; --------------------------------------------------------------------------
SECTION SEG_CONST
alignz 16
global EXTN(jconst_fancy_upsample_mmx)
EXTN(jconst_fancy_upsample_mmx):
PW_ONE times 4 dw 1
PW_TWO times 4 dw 2
PW_THREE times 4 dw 3
PW_SEVEN times 4 dw 7
PW_EIGHT times 4 dw 8
alignz 16
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
;
; Fancy processing for the common case of 2:1 horizontal and 1:1 vertical.
;
; The upsampling algorithm is linear interpolation between pixel centers,
; also known as a "triangle filter". This is a good compromise between
; speed and visual quality. The centers of the output pixels are 1/4 and 3/4
; of the way between input pixel centers.
;
; GLOBAL(void)
; jsimd_h2v1_fancy_upsample_mmx (int max_v_samp_factor,
; JDIMENSION downsampled_width,
; JSAMPARRAY input_data,
; JSAMPARRAY *output_data_ptr);
;
%define max_v_samp(b) (b)+8 ; int max_v_samp_factor
%define downsamp_width(b) (b)+12 ; JDIMENSION downsampled_width
%define input_data(b) (b)+16 ; JSAMPARRAY input_data
%define output_data_ptr(b) (b)+20 ; JSAMPARRAY *output_data_ptr
align 16
global EXTN(jsimd_h2v1_fancy_upsample_mmx)
EXTN(jsimd_h2v1_fancy_upsample_mmx):
push ebp
mov ebp,esp
pushpic ebx
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
get_GOT ebx ; get GOT address
mov eax, JDIMENSION [downsamp_width(ebp)] ; colctr
test eax,eax
jz near .return
mov ecx, INT [max_v_samp(ebp)] ; rowctr
test ecx,ecx
jz near .return
mov esi, JSAMPARRAY [input_data(ebp)] ; input_data
mov edi, POINTER [output_data_ptr(ebp)]
mov edi, JSAMPARRAY [edi] ; output_data
alignx 16,7
.rowloop:
push eax ; colctr
push edi
push esi
mov esi, JSAMPROW [esi] ; inptr
mov edi, JSAMPROW [edi] ; outptr
test eax, SIZEOF_MMWORD-1
jz short .skip
mov dl, JSAMPLE [esi+(eax-1)*SIZEOF_JSAMPLE]
mov JSAMPLE [esi+eax*SIZEOF_JSAMPLE], dl ; insert a dummy sample
.skip:
pxor mm0,mm0 ; mm0=(all 0's)
pcmpeqb mm7,mm7
psrlq mm7,(SIZEOF_MMWORD-1)*BYTE_BIT
pand mm7, MMWORD [esi+0*SIZEOF_MMWORD]
add eax, byte SIZEOF_MMWORD-1
and eax, byte -SIZEOF_MMWORD
cmp eax, byte SIZEOF_MMWORD
ja short .columnloop
alignx 16,7
.columnloop_last:
pcmpeqb mm6,mm6
psllq mm6,(SIZEOF_MMWORD-1)*BYTE_BIT
pand mm6, MMWORD [esi+0*SIZEOF_MMWORD]
jmp short .upsample
alignx 16,7
.columnloop:
movq mm6, MMWORD [esi+1*SIZEOF_MMWORD]
psllq mm6,(SIZEOF_MMWORD-1)*BYTE_BIT
.upsample:
movq mm1, MMWORD [esi+0*SIZEOF_MMWORD]
movq mm2,mm1
movq mm3,mm1 ; mm1=( 0 1 2 3 4 5 6 7)
psllq mm2,BYTE_BIT ; mm2=( - 0 1 2 3 4 5 6)
psrlq mm3,BYTE_BIT ; mm3=( 1 2 3 4 5 6 7 -)
por mm2,mm7 ; mm2=(-1 0 1 2 3 4 5 6)
por mm3,mm6 ; mm3=( 1 2 3 4 5 6 7 8)
movq mm7,mm1
psrlq mm7,(SIZEOF_MMWORD-1)*BYTE_BIT ; mm7=( 7 - - - - - - -)
movq mm4,mm1
punpcklbw mm1,mm0 ; mm1=( 0 1 2 3)
punpckhbw mm4,mm0 ; mm4=( 4 5 6 7)
movq mm5,mm2
punpcklbw mm2,mm0 ; mm2=(-1 0 1 2)
punpckhbw mm5,mm0 ; mm5=( 3 4 5 6)
movq mm6,mm3
punpcklbw mm3,mm0 ; mm3=( 1 2 3 4)
punpckhbw mm6,mm0 ; mm6=( 5 6 7 8)
pmullw mm1,[GOTOFF(ebx,PW_THREE)]
pmullw mm4,[GOTOFF(ebx,PW_THREE)]
paddw mm2,[GOTOFF(ebx,PW_ONE)]
paddw mm5,[GOTOFF(ebx,PW_ONE)]
paddw mm3,[GOTOFF(ebx,PW_TWO)]
paddw mm6,[GOTOFF(ebx,PW_TWO)]
paddw mm2,mm1
paddw mm5,mm4
psrlw mm2,2 ; mm2=OutLE=( 0 2 4 6)
psrlw mm5,2 ; mm5=OutHE=( 8 10 12 14)
paddw mm3,mm1
paddw mm6,mm4
psrlw mm3,2 ; mm3=OutLO=( 1 3 5 7)
psrlw mm6,2 ; mm6=OutHO=( 9 11 13 15)
psllw mm3,BYTE_BIT
psllw mm6,BYTE_BIT
por mm2,mm3 ; mm2=OutL=( 0 1 2 3 4 5 6 7)
por mm5,mm6 ; mm5=OutH=( 8 9 10 11 12 13 14 15)
movq MMWORD [edi+0*SIZEOF_MMWORD], mm2
movq MMWORD [edi+1*SIZEOF_MMWORD], mm5
sub eax, byte SIZEOF_MMWORD
add esi, byte 1*SIZEOF_MMWORD ; inptr
add edi, byte 2*SIZEOF_MMWORD ; outptr
cmp eax, byte SIZEOF_MMWORD
ja near .columnloop
test eax,eax
jnz near .columnloop_last
pop esi
pop edi
pop eax
add esi, byte SIZEOF_JSAMPROW ; input_data
add edi, byte SIZEOF_JSAMPROW ; output_data
dec ecx ; rowctr
jg near .rowloop
emms ; empty MMX state
.return:
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
poppic ebx
pop ebp
ret
; --------------------------------------------------------------------------
;
; Fancy processing for the common case of 2:1 horizontal and 2:1 vertical.
; Again a triangle filter; see comments for h2v1 case, above.
;
; GLOBAL(void)
; jsimd_h2v2_fancy_upsample_mmx (int max_v_samp_factor,
; JDIMENSION downsampled_width,
; JSAMPARRAY input_data,
; JSAMPARRAY *output_data_ptr);
;
%define max_v_samp(b) (b)+8 ; int max_v_samp_factor
%define downsamp_width(b) (b)+12 ; JDIMENSION downsampled_width
%define input_data(b) (b)+16 ; JSAMPARRAY input_data
%define output_data_ptr(b) (b)+20 ; JSAMPARRAY *output_data_ptr
%define original_ebp ebp+0
%define wk(i) ebp-(WK_NUM-(i))*SIZEOF_MMWORD ; mmword wk[WK_NUM]
%define WK_NUM 4
%define gotptr wk(0)-SIZEOF_POINTER ; void *gotptr
align 16
global EXTN(jsimd_h2v2_fancy_upsample_mmx)
EXTN(jsimd_h2v2_fancy_upsample_mmx):
push ebp
mov eax,esp ; eax = original ebp
sub esp, byte 4
and esp, byte (-SIZEOF_MMWORD) ; align to 64 bits
mov [esp],eax
mov ebp,esp ; ebp = aligned ebp
lea esp, [wk(0)]
pushpic eax ; make a room for GOT address
push ebx
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
get_GOT ebx ; get GOT address
movpic POINTER [gotptr], ebx ; save GOT address
mov edx,eax ; edx = original ebp
mov eax, JDIMENSION [downsamp_width(edx)] ; colctr
test eax,eax
jz near .return
mov ecx, INT [max_v_samp(edx)] ; rowctr
test ecx,ecx
jz near .return
mov esi, JSAMPARRAY [input_data(edx)] ; input_data
mov edi, POINTER [output_data_ptr(edx)]
mov edi, JSAMPARRAY [edi] ; output_data
alignx 16,7
.rowloop:
push eax ; colctr
push ecx
push edi
push esi
mov ecx, JSAMPROW [esi-1*SIZEOF_JSAMPROW] ; inptr1(above)
mov ebx, JSAMPROW [esi+0*SIZEOF_JSAMPROW] ; inptr0
mov esi, JSAMPROW [esi+1*SIZEOF_JSAMPROW] ; inptr1(below)
mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW] ; outptr0
mov edi, JSAMPROW [edi+1*SIZEOF_JSAMPROW] ; outptr1
test eax, SIZEOF_MMWORD-1
jz short .skip
push edx
mov dl, JSAMPLE [ecx+(eax-1)*SIZEOF_JSAMPLE]
mov JSAMPLE [ecx+eax*SIZEOF_JSAMPLE], dl
mov dl, JSAMPLE [ebx+(eax-1)*SIZEOF_JSAMPLE]
mov JSAMPLE [ebx+eax*SIZEOF_JSAMPLE], dl
mov dl, JSAMPLE [esi+(eax-1)*SIZEOF_JSAMPLE]
mov JSAMPLE [esi+eax*SIZEOF_JSAMPLE], dl ; insert a dummy sample
pop edx
.skip:
; -- process the first column block
movq mm0, MMWORD [ebx+0*SIZEOF_MMWORD] ; mm0=row[ 0][0]
movq mm1, MMWORD [ecx+0*SIZEOF_MMWORD] ; mm1=row[-1][0]
movq mm2, MMWORD [esi+0*SIZEOF_MMWORD] ; mm2=row[+1][0]
pushpic ebx
movpic ebx, POINTER [gotptr] ; load GOT address
pxor mm3,mm3 ; mm3=(all 0's)
movq mm4,mm0
punpcklbw mm0,mm3 ; mm0=row[ 0][0]( 0 1 2 3)
punpckhbw mm4,mm3 ; mm4=row[ 0][0]( 4 5 6 7)
movq mm5,mm1
punpcklbw mm1,mm3 ; mm1=row[-1][0]( 0 1 2 3)
punpckhbw mm5,mm3 ; mm5=row[-1][0]( 4 5 6 7)
movq mm6,mm2
punpcklbw mm2,mm3 ; mm2=row[+1][0]( 0 1 2 3)
punpckhbw mm6,mm3 ; mm6=row[+1][0]( 4 5 6 7)
pmullw mm0,[GOTOFF(ebx,PW_THREE)]
pmullw mm4,[GOTOFF(ebx,PW_THREE)]
pcmpeqb mm7,mm7
psrlq mm7,(SIZEOF_MMWORD-2)*BYTE_BIT
paddw mm1,mm0 ; mm1=Int0L=( 0 1 2 3)
paddw mm5,mm4 ; mm5=Int0H=( 4 5 6 7)
paddw mm2,mm0 ; mm2=Int1L=( 0 1 2 3)
paddw mm6,mm4 ; mm6=Int1H=( 4 5 6 7)
movq MMWORD [edx+0*SIZEOF_MMWORD], mm1 ; temporarily save
movq MMWORD [edx+1*SIZEOF_MMWORD], mm5 ; the intermediate data
movq MMWORD [edi+0*SIZEOF_MMWORD], mm2
movq MMWORD [edi+1*SIZEOF_MMWORD], mm6
pand mm1,mm7 ; mm1=( 0 - - -)
pand mm2,mm7 ; mm2=( 0 - - -)
movq MMWORD [wk(0)], mm1
movq MMWORD [wk(1)], mm2
poppic ebx
add eax, byte SIZEOF_MMWORD-1
and eax, byte -SIZEOF_MMWORD
cmp eax, byte SIZEOF_MMWORD
ja short .columnloop
alignx 16,7
.columnloop_last:
; -- process the last column block
pushpic ebx
movpic ebx, POINTER [gotptr] ; load GOT address
pcmpeqb mm1,mm1
psllq mm1,(SIZEOF_MMWORD-2)*BYTE_BIT
movq mm2,mm1
pand mm1, MMWORD [edx+1*SIZEOF_MMWORD] ; mm1=( - - - 7)
pand mm2, MMWORD [edi+1*SIZEOF_MMWORD] ; mm2=( - - - 7)
movq MMWORD [wk(2)], mm1
movq MMWORD [wk(3)], mm2
jmp short .upsample
alignx 16,7
.columnloop:
; -- process the next column block
movq mm0, MMWORD [ebx+1*SIZEOF_MMWORD] ; mm0=row[ 0][1]
movq mm1, MMWORD [ecx+1*SIZEOF_MMWORD] ; mm1=row[-1][1]
movq mm2, MMWORD [esi+1*SIZEOF_MMWORD] ; mm2=row[+1][1]
pushpic ebx
movpic ebx, POINTER [gotptr] ; load GOT address
pxor mm3,mm3 ; mm3=(all 0's)
movq mm4,mm0
punpcklbw mm0,mm3 ; mm0=row[ 0][1]( 0 1 2 3)
punpckhbw mm4,mm3 ; mm4=row[ 0][1]( 4 5 6 7)
movq mm5,mm1
punpcklbw mm1,mm3 ; mm1=row[-1][1]( 0 1 2 3)
punpckhbw mm5,mm3 ; mm5=row[-1][1]( 4 5 6 7)
movq mm6,mm2
punpcklbw mm2,mm3 ; mm2=row[+1][1]( 0 1 2 3)
punpckhbw mm6,mm3 ; mm6=row[+1][1]( 4 5 6 7)
pmullw mm0,[GOTOFF(ebx,PW_THREE)]
pmullw mm4,[GOTOFF(ebx,PW_THREE)]
paddw mm1,mm0 ; mm1=Int0L=( 0 1 2 3)
paddw mm5,mm4 ; mm5=Int0H=( 4 5 6 7)
paddw mm2,mm0 ; mm2=Int1L=( 0 1 2 3)
paddw mm6,mm4 ; mm6=Int1H=( 4 5 6 7)
movq MMWORD [edx+2*SIZEOF_MMWORD], mm1 ; temporarily save
movq MMWORD [edx+3*SIZEOF_MMWORD], mm5 ; the intermediate data
movq MMWORD [edi+2*SIZEOF_MMWORD], mm2
movq MMWORD [edi+3*SIZEOF_MMWORD], mm6
psllq mm1,(SIZEOF_MMWORD-2)*BYTE_BIT ; mm1=( - - - 0)
psllq mm2,(SIZEOF_MMWORD-2)*BYTE_BIT ; mm2=( - - - 0)
movq MMWORD [wk(2)], mm1
movq MMWORD [wk(3)], mm2
.upsample:
; -- process the upper row
movq mm7, MMWORD [edx+0*SIZEOF_MMWORD] ; mm7=Int0L=( 0 1 2 3)
movq mm3, MMWORD [edx+1*SIZEOF_MMWORD] ; mm3=Int0H=( 4 5 6 7)
movq mm0,mm7
movq mm4,mm3
psrlq mm0,2*BYTE_BIT ; mm0=( 1 2 3 -)
psllq mm4,(SIZEOF_MMWORD-2)*BYTE_BIT ; mm4=( - - - 4)
movq mm5,mm7
movq mm6,mm3
psrlq mm5,(SIZEOF_MMWORD-2)*BYTE_BIT ; mm5=( 3 - - -)
psllq mm6,2*BYTE_BIT ; mm6=( - 4 5 6)
por mm0,mm4 ; mm0=( 1 2 3 4)
por mm5,mm6 ; mm5=( 3 4 5 6)
movq mm1,mm7
movq mm2,mm3
psllq mm1,2*BYTE_BIT ; mm1=( - 0 1 2)
psrlq mm2,2*BYTE_BIT ; mm2=( 5 6 7 -)
movq mm4,mm3
psrlq mm4,(SIZEOF_MMWORD-2)*BYTE_BIT ; mm4=( 7 - - -)
por mm1, MMWORD [wk(0)] ; mm1=(-1 0 1 2)
por mm2, MMWORD [wk(2)] ; mm2=( 5 6 7 8)
movq MMWORD [wk(0)], mm4
pmullw mm7,[GOTOFF(ebx,PW_THREE)]
pmullw mm3,[GOTOFF(ebx,PW_THREE)]
paddw mm1,[GOTOFF(ebx,PW_EIGHT)]
paddw mm5,[GOTOFF(ebx,PW_EIGHT)]
paddw mm0,[GOTOFF(ebx,PW_SEVEN)]
paddw mm2,[GOTOFF(ebx,PW_SEVEN)]
paddw mm1,mm7
paddw mm5,mm3
psrlw mm1,4 ; mm1=Out0LE=( 0 2 4 6)
psrlw mm5,4 ; mm5=Out0HE=( 8 10 12 14)
paddw mm0,mm7
paddw mm2,mm3
psrlw mm0,4 ; mm0=Out0LO=( 1 3 5 7)
psrlw mm2,4 ; mm2=Out0HO=( 9 11 13 15)
psllw mm0,BYTE_BIT
psllw mm2,BYTE_BIT
por mm1,mm0 ; mm1=Out0L=( 0 1 2 3 4 5 6 7)
por mm5,mm2 ; mm5=Out0H=( 8 9 10 11 12 13 14 15)
movq MMWORD [edx+0*SIZEOF_MMWORD], mm1
movq MMWORD [edx+1*SIZEOF_MMWORD], mm5
; -- process the lower row
movq mm6, MMWORD [edi+0*SIZEOF_MMWORD] ; mm6=Int1L=( 0 1 2 3)
movq mm4, MMWORD [edi+1*SIZEOF_MMWORD] ; mm4=Int1H=( 4 5 6 7)
movq mm7,mm6
movq mm3,mm4
psrlq mm7,2*BYTE_BIT ; mm7=( 1 2 3 -)
psllq mm3,(SIZEOF_MMWORD-2)*BYTE_BIT ; mm3=( - - - 4)
movq mm0,mm6
movq mm2,mm4
psrlq mm0,(SIZEOF_MMWORD-2)*BYTE_BIT ; mm0=( 3 - - -)
psllq mm2,2*BYTE_BIT ; mm2=( - 4 5 6)
por mm7,mm3 ; mm7=( 1 2 3 4)
por mm0,mm2 ; mm0=( 3 4 5 6)
movq mm1,mm6
movq mm5,mm4
psllq mm1,2*BYTE_BIT ; mm1=( - 0 1 2)
psrlq mm5,2*BYTE_BIT ; mm5=( 5 6 7 -)
movq mm3,mm4
psrlq mm3,(SIZEOF_MMWORD-2)*BYTE_BIT ; mm3=( 7 - - -)
por mm1, MMWORD [wk(1)] ; mm1=(-1 0 1 2)
por mm5, MMWORD [wk(3)] ; mm5=( 5 6 7 8)
movq MMWORD [wk(1)], mm3
pmullw mm6,[GOTOFF(ebx,PW_THREE)]
pmullw mm4,[GOTOFF(ebx,PW_THREE)]
paddw mm1,[GOTOFF(ebx,PW_EIGHT)]
paddw mm0,[GOTOFF(ebx,PW_EIGHT)]
paddw mm7,[GOTOFF(ebx,PW_SEVEN)]
paddw mm5,[GOTOFF(ebx,PW_SEVEN)]
paddw mm1,mm6
paddw mm0,mm4
psrlw mm1,4 ; mm1=Out1LE=( 0 2 4 6)
psrlw mm0,4 ; mm0=Out1HE=( 8 10 12 14)
paddw mm7,mm6
paddw mm5,mm4
psrlw mm7,4 ; mm7=Out1LO=( 1 3 5 7)
psrlw mm5,4 ; mm5=Out1HO=( 9 11 13 15)
psllw mm7,BYTE_BIT
psllw mm5,BYTE_BIT
por mm1,mm7 ; mm1=Out1L=( 0 1 2 3 4 5 6 7)
por mm0,mm5 ; mm0=Out1H=( 8 9 10 11 12 13 14 15)
movq MMWORD [edi+0*SIZEOF_MMWORD], mm1
movq MMWORD [edi+1*SIZEOF_MMWORD], mm0
poppic ebx
sub eax, byte SIZEOF_MMWORD
add ecx, byte 1*SIZEOF_MMWORD ; inptr1(above)
add ebx, byte 1*SIZEOF_MMWORD ; inptr0
add esi, byte 1*SIZEOF_MMWORD ; inptr1(below)
add edx, byte 2*SIZEOF_MMWORD ; outptr0
add edi, byte 2*SIZEOF_MMWORD ; outptr1
cmp eax, byte SIZEOF_MMWORD
ja near .columnloop
test eax,eax
jnz near .columnloop_last
pop esi
pop edi
pop ecx
pop eax
add esi, byte 1*SIZEOF_JSAMPROW ; input_data
add edi, byte 2*SIZEOF_JSAMPROW ; output_data
sub ecx, byte 2 ; rowctr
jg near .rowloop
emms ; empty MMX state
.return:
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
pop ebx
mov esp,ebp ; esp <- aligned ebp
pop esp ; esp <- original ebp
pop ebp
ret
; --------------------------------------------------------------------------
;
; Fast processing for the common case of 2:1 horizontal and 1:1 vertical.
; It's still a box filter.
;
; GLOBAL(void)
; jsimd_h2v1_upsample_mmx (int max_v_samp_factor,
; JDIMENSION output_width,
; JSAMPARRAY input_data,
; JSAMPARRAY *output_data_ptr);
;
%define max_v_samp(b) (b)+8 ; int max_v_samp_factor
%define output_width(b) (b)+12 ; JDIMENSION output_width
%define input_data(b) (b)+16 ; JSAMPARRAY input_data
%define output_data_ptr(b) (b)+20 ; JSAMPARRAY *output_data_ptr
align 16
global EXTN(jsimd_h2v1_upsample_mmx)
EXTN(jsimd_h2v1_upsample_mmx):
push ebp
mov ebp,esp
; push ebx ; unused
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
mov edx, JDIMENSION [output_width(ebp)]
add edx, byte (2*SIZEOF_MMWORD)-1
and edx, byte -(2*SIZEOF_MMWORD)
jz short .return
mov ecx, INT [max_v_samp(ebp)] ; rowctr
test ecx,ecx
jz short .return
mov esi, JSAMPARRAY [input_data(ebp)] ; input_data
mov edi, POINTER [output_data_ptr(ebp)]
mov edi, JSAMPARRAY [edi] ; output_data
alignx 16,7
.rowloop:
push edi
push esi
mov esi, JSAMPROW [esi] ; inptr
mov edi, JSAMPROW [edi] ; outptr
mov eax,edx ; colctr
alignx 16,7
.columnloop:
movq mm0, MMWORD [esi+0*SIZEOF_MMWORD]
movq mm1,mm0
punpcklbw mm0,mm0
punpckhbw mm1,mm1
movq MMWORD [edi+0*SIZEOF_MMWORD], mm0
movq MMWORD [edi+1*SIZEOF_MMWORD], mm1
sub eax, byte 2*SIZEOF_MMWORD
jz short .nextrow
movq mm2, MMWORD [esi+1*SIZEOF_MMWORD]
movq mm3,mm2
punpcklbw mm2,mm2
punpckhbw mm3,mm3
movq MMWORD [edi+2*SIZEOF_MMWORD], mm2
movq MMWORD [edi+3*SIZEOF_MMWORD], mm3
sub eax, byte 2*SIZEOF_MMWORD
jz short .nextrow
add esi, byte 2*SIZEOF_MMWORD ; inptr
add edi, byte 4*SIZEOF_MMWORD ; outptr
jmp short .columnloop
alignx 16,7
.nextrow:
pop esi
pop edi
add esi, byte SIZEOF_JSAMPROW ; input_data
add edi, byte SIZEOF_JSAMPROW ; output_data
dec ecx ; rowctr
jg short .rowloop
emms ; empty MMX state
.return:
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
; pop ebx ; unused
pop ebp
ret
; --------------------------------------------------------------------------
;
; Fast processing for the common case of 2:1 horizontal and 2:1 vertical.
; It's still a box filter.
;
; GLOBAL(void)
; jsimd_h2v2_upsample_mmx (int max_v_samp_factor,
; JDIMENSION output_width,
; JSAMPARRAY input_data,
; JSAMPARRAY *output_data_ptr);
;
%define max_v_samp(b) (b)+8 ; int max_v_samp_factor
%define output_width(b) (b)+12 ; JDIMENSION output_width
%define input_data(b) (b)+16 ; JSAMPARRAY input_data
%define output_data_ptr(b) (b)+20 ; JSAMPARRAY *output_data_ptr
align 16
global EXTN(jsimd_h2v2_upsample_mmx)
EXTN(jsimd_h2v2_upsample_mmx):
push ebp
mov ebp,esp
push ebx
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
mov edx, JDIMENSION [output_width(ebp)]
add edx, byte (2*SIZEOF_MMWORD)-1
and edx, byte -(2*SIZEOF_MMWORD)
jz near .return
mov ecx, INT [max_v_samp(ebp)] ; rowctr
test ecx,ecx
jz short .return
mov esi, JSAMPARRAY [input_data(ebp)] ; input_data
mov edi, POINTER [output_data_ptr(ebp)]
mov edi, JSAMPARRAY [edi] ; output_data
alignx 16,7
.rowloop:
push edi
push esi
mov esi, JSAMPROW [esi] ; inptr
mov ebx, JSAMPROW [edi+0*SIZEOF_JSAMPROW] ; outptr0
mov edi, JSAMPROW [edi+1*SIZEOF_JSAMPROW] ; outptr1
mov eax,edx ; colctr
alignx 16,7
.columnloop:
movq mm0, MMWORD [esi+0*SIZEOF_MMWORD]
movq mm1,mm0
punpcklbw mm0,mm0
punpckhbw mm1,mm1
movq MMWORD [ebx+0*SIZEOF_MMWORD], mm0
movq MMWORD [ebx+1*SIZEOF_MMWORD], mm1
movq MMWORD [edi+0*SIZEOF_MMWORD], mm0
movq MMWORD [edi+1*SIZEOF_MMWORD], mm1
sub eax, byte 2*SIZEOF_MMWORD
jz short .nextrow
movq mm2, MMWORD [esi+1*SIZEOF_MMWORD]
movq mm3,mm2
punpcklbw mm2,mm2
punpckhbw mm3,mm3
movq MMWORD [ebx+2*SIZEOF_MMWORD], mm2
movq MMWORD [ebx+3*SIZEOF_MMWORD], mm3
movq MMWORD [edi+2*SIZEOF_MMWORD], mm2
movq MMWORD [edi+3*SIZEOF_MMWORD], mm3
sub eax, byte 2*SIZEOF_MMWORD
jz short .nextrow
add esi, byte 2*SIZEOF_MMWORD ; inptr
add ebx, byte 4*SIZEOF_MMWORD ; outptr0
add edi, byte 4*SIZEOF_MMWORD ; outptr1
jmp short .columnloop
alignx 16,7
.nextrow:
pop esi
pop edi
add esi, byte 1*SIZEOF_JSAMPROW ; input_data
add edi, byte 2*SIZEOF_JSAMPROW ; output_data
sub ecx, byte 2 ; rowctr
jg short .rowloop
emms ; empty MMX state
.return:
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
pop ebx
pop ebp
ret
; For some reason, the OS X linker does not honor the request to align the
; segment unless we do this.
align 16
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