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;
; jdsample.asm - upsampling (MMX)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright (C) 2016, 2024, D. R. Commander.
;
; 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) or Yasm.
%include "jsimdext.inc"
; --------------------------------------------------------------------------
SECTION SEG_CONST
ALIGNZ 32
GLOBAL_DATA(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 32
; --------------------------------------------------------------------------
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 32
GLOBAL_FUNCTION(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 32
GLOBAL_FUNCTION(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 32
GLOBAL_FUNCTION(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 32
GLOBAL_FUNCTION(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 32