;
; jidctred.asm - reduced-size IDCT (SSE2)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
;
; Based on
; 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
;
; This file contains inverse-DCT routines that produce reduced-size
; output: either 4x4 or 2x2 pixels from an 8x8 DCT block.
; The following code is based directly on the IJG's original jidctred.c;
; see the jidctred.c for more details.
;
; [TAB8]
%include "jsimdext.inc"
%include "jdct.inc"
; --------------------------------------------------------------------------
%define CONST_BITS 13
%define PASS1_BITS 2
%define DESCALE_P1_4 (CONST_BITS-PASS1_BITS+1)
%define DESCALE_P2_4 (CONST_BITS+PASS1_BITS+3+1)
%define DESCALE_P1_2 (CONST_BITS-PASS1_BITS+2)
%define DESCALE_P2_2 (CONST_BITS+PASS1_BITS+3+2)
%if CONST_BITS == 13
F_0_211 equ 1730 ; FIX(0.211164243)
F_0_509 equ 4176 ; FIX(0.509795579)
F_0_601 equ 4926 ; FIX(0.601344887)
F_0_720 equ 5906 ; FIX(0.720959822)
F_0_765 equ 6270 ; FIX(0.765366865)
F_0_850 equ 6967 ; FIX(0.850430095)
F_0_899 equ 7373 ; FIX(0.899976223)
F_1_061 equ 8697 ; FIX(1.061594337)
F_1_272 equ 10426 ; FIX(1.272758580)
F_1_451 equ 11893 ; FIX(1.451774981)
F_1_847 equ 15137 ; FIX(1.847759065)
F_2_172 equ 17799 ; FIX(2.172734803)
F_2_562 equ 20995 ; FIX(2.562915447)
F_3_624 equ 29692 ; FIX(3.624509785)
%else
; NASM cannot do compile-time arithmetic on floating-point constants.
%define DESCALE(x,n) (((x)+(1<<((n)-1)))>>(n))
F_0_211 equ DESCALE( 226735879,30-CONST_BITS) ; FIX(0.211164243)
F_0_509 equ DESCALE( 547388834,30-CONST_BITS) ; FIX(0.509795579)
F_0_601 equ DESCALE( 645689155,30-CONST_BITS) ; FIX(0.601344887)
F_0_720 equ DESCALE( 774124714,30-CONST_BITS) ; FIX(0.720959822)
F_0_765 equ DESCALE( 821806413,30-CONST_BITS) ; FIX(0.765366865)
F_0_850 equ DESCALE( 913142361,30-CONST_BITS) ; FIX(0.850430095)
F_0_899 equ DESCALE( 966342111,30-CONST_BITS) ; FIX(0.899976223)
F_1_061 equ DESCALE(1139878239,30-CONST_BITS) ; FIX(1.061594337)
F_1_272 equ DESCALE(1366614119,30-CONST_BITS) ; FIX(1.272758580)
F_1_451 equ DESCALE(1558831516,30-CONST_BITS) ; FIX(1.451774981)
F_1_847 equ DESCALE(1984016188,30-CONST_BITS) ; FIX(1.847759065)
F_2_172 equ DESCALE(2332956230,30-CONST_BITS) ; FIX(2.172734803)
F_2_562 equ DESCALE(2751909506,30-CONST_BITS) ; FIX(2.562915447)
F_3_624 equ DESCALE(3891787747,30-CONST_BITS) ; FIX(3.624509785)
%endif
; --------------------------------------------------------------------------
SECTION SEG_CONST
alignz 16
global EXTN(jconst_idct_red_sse2)
EXTN(jconst_idct_red_sse2):
PW_F184_MF076 times 4 dw F_1_847,-F_0_765
PW_F256_F089 times 4 dw F_2_562, F_0_899
PW_F106_MF217 times 4 dw F_1_061,-F_2_172
PW_MF060_MF050 times 4 dw -F_0_601,-F_0_509
PW_F145_MF021 times 4 dw F_1_451,-F_0_211
PW_F362_MF127 times 4 dw F_3_624,-F_1_272
PW_F085_MF072 times 4 dw F_0_850,-F_0_720
PD_DESCALE_P1_4 times 4 dd 1 << (DESCALE_P1_4-1)
PD_DESCALE_P2_4 times 4 dd 1 << (DESCALE_P2_4-1)
PD_DESCALE_P1_2 times 4 dd 1 << (DESCALE_P1_2-1)
PD_DESCALE_P2_2 times 4 dd 1 << (DESCALE_P2_2-1)
PB_CENTERJSAMP times 16 db CENTERJSAMPLE
alignz 16
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
;
; Perform dequantization and inverse DCT on one block of coefficients,
; producing a reduced-size 4x4 output block.
;
; GLOBAL(void)
; jsimd_idct_4x4_sse2 (void * dct_table, JCOEFPTR coef_block,
; JSAMPARRAY output_buf, JDIMENSION output_col)
;
%define dct_table(b) (b)+8 ; void * dct_table
%define coef_block(b) (b)+12 ; JCOEFPTR coef_block
%define output_buf(b) (b)+16 ; JSAMPARRAY output_buf
%define output_col(b) (b)+20 ; JDIMENSION output_col
%define original_ebp ebp+0
%define wk(i) ebp-(WK_NUM-(i))*SIZEOF_XMMWORD ; xmmword wk[WK_NUM]
%define WK_NUM 2
align 16
global EXTN(jsimd_idct_4x4_sse2)
EXTN(jsimd_idct_4x4_sse2):
push ebp
mov eax,esp ; eax = original ebp
sub esp, byte 4
and esp, byte (-SIZEOF_XMMWORD) ; align to 128 bits
mov [esp],eax
mov ebp,esp ; ebp = aligned ebp
lea esp, [wk(0)]
pushpic ebx
; push ecx ; unused
; push edx ; need not be preserved
push esi
push edi
get_GOT ebx ; get GOT address
; ---- Pass 1: process columns from input.
; mov eax, [original_ebp]
mov edx, POINTER [dct_table(eax)] ; quantptr
mov esi, JCOEFPTR [coef_block(eax)] ; inptr
%ifndef NO_ZERO_COLUMN_TEST_4X4_SSE2
mov eax, DWORD [DWBLOCK(1,0,esi,SIZEOF_JCOEF)]
or eax, DWORD [DWBLOCK(2,0,esi,SIZEOF_JCOEF)]
jnz short .columnDCT
movdqa xmm0, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movdqa xmm1, XMMWORD [XMMBLOCK(2,0,esi,SIZEOF_JCOEF)]
por xmm0, XMMWORD [XMMBLOCK(3,0,esi,SIZEOF_JCOEF)]
por xmm1, XMMWORD [XMMBLOCK(5,0,esi,SIZEOF_JCOEF)]
por xmm0, XMMWORD [XMMBLOCK(6,0,esi,SIZEOF_JCOEF)]
por xmm1, XMMWORD [XMMBLOCK(7,0,esi,SIZEOF_JCOEF)]
por xmm0,xmm1
packsswb xmm0,xmm0
packsswb xmm0,xmm0
movd eax,xmm0
test eax,eax
jnz short .columnDCT
; -- AC terms all zero
movdqa xmm0, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_JCOEF)]
pmullw xmm0, XMMWORD [XMMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
psllw xmm0,PASS1_BITS
movdqa xmm3,xmm0 ; xmm0=in0=(00 01 02 03 04 05 06 07)
punpcklwd xmm0,xmm0 ; xmm0=(00 00 01 01 02 02 03 03)
punpckhwd xmm3,xmm3 ; xmm3=(04 04 05 05 06 06 07 07)
pshufd xmm1,xmm0,0x50 ; xmm1=[col0 col1]=(00 00 00 00 01 01 01 01)
pshufd xmm0,xmm0,0xFA ; xmm0=[col2 col3]=(02 02 02 02 03 03 03 03)
pshufd xmm6,xmm3,0x50 ; xmm6=[col4 col5]=(04 04 04 04 05 05 05 05)
pshufd xmm3,xmm3,0xFA ; xmm3=[col6 col7]=(06 06 06 06 07 07 07 07)
jmp near .column_end
alignx 16,7
%endif
.columnDCT:
; -- Odd part
movdqa xmm0, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movdqa xmm1, XMMWORD [XMMBLOCK(3,0,esi,SIZEOF_JCOEF)]
pmullw xmm0, XMMWORD [XMMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw xmm1, XMMWORD [XMMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movdqa xmm2, XMMWORD [XMMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movdqa xmm3, XMMWORD [XMMBLOCK(7,0,esi,SIZEOF_JCOEF)]
pmullw xmm2, XMMWORD [XMMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw xmm3, XMMWORD [XMMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movdqa xmm4,xmm0
movdqa xmm5,xmm0
punpcklwd xmm4,xmm1
punpckhwd xmm5,xmm1
movdqa xmm0,xmm4
movdqa xmm1,xmm5
pmaddwd xmm4,[GOTOFF(ebx,PW_F256_F089)] ; xmm4=(tmp2L)
pmaddwd xmm5,[GOTOFF(ebx,PW_F256_F089)] ; xmm5=(tmp2H)
pmaddwd xmm0,[GOTOFF(ebx,PW_F106_MF217)] ; xmm0=(tmp0L)
pmaddwd xmm1,[GOTOFF(ebx,PW_F106_MF217)] ; xmm1=(tmp0H)
movdqa xmm6,xmm2
movdqa xmm7,xmm2
punpcklwd xmm6,xmm3
punpckhwd xmm7,xmm3
movdqa xmm2,xmm6
movdqa xmm3,xmm7
pmaddwd xmm6,[GOTOFF(ebx,PW_MF060_MF050)] ; xmm6=(tmp2L)
pmaddwd xmm7,[GOTOFF(ebx,PW_MF060_MF050)] ; xmm7=(tmp2H)
pmaddwd xmm2,[GOTOFF(ebx,PW_F145_MF021)] ; xmm2=(tmp0L)
pmaddwd xmm3,[GOTOFF(ebx,PW_F145_MF021)] ; xmm3=(tmp0H)
paddd xmm6,xmm4 ; xmm6=tmp2L
paddd xmm7,xmm5 ; xmm7=tmp2H
paddd xmm2,xmm0 ; xmm2=tmp0L
paddd xmm3,xmm1 ; xmm3=tmp0H
movdqa XMMWORD [wk(0)], xmm2 ; wk(0)=tmp0L
movdqa XMMWORD [wk(1)], xmm3 ; wk(1)=tmp0H
; -- Even part
movdqa xmm4, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movdqa xmm5, XMMWORD [XMMBLOCK(2,0,esi,SIZEOF_JCOEF)]
movdqa xmm0, XMMWORD [XMMBLOCK(6,0,esi,SIZEOF_JCOEF)]
pmullw xmm4, XMMWORD [XMMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw xmm5, XMMWORD [XMMBLOCK(2,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw xmm0, XMMWORD [XMMBLOCK(6,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pxor xmm1,xmm1
pxor xmm2,xmm2
punpcklwd xmm1,xmm4 ; xmm1=tmp0L
punpckhwd xmm2,xmm4 ; xmm2=tmp0H
psrad xmm1,(16-CONST_BITS-1) ; psrad xmm1,16 & pslld xmm1,CONST_BITS+1
psrad xmm2,(16-CONST_BITS-1) ; psrad xmm2,16 & pslld xmm2,CONST_BITS+1
movdqa xmm3,xmm5 ; xmm5=in2=z2
punpcklwd xmm5,xmm0 ; xmm0=in6=z3
punpckhwd xmm3,xmm0
pmaddwd xmm5,[GOTOFF(ebx,PW_F184_MF076)] ; xmm5=tmp2L
pmaddwd xmm3,[GOTOFF(ebx,PW_F184_MF076)] ; xmm3=tmp2H
movdqa xmm4,xmm1
movdqa xmm0,xmm2
paddd xmm1,xmm5 ; xmm1=tmp10L
paddd xmm2,xmm3 ; xmm2=tmp10H
psubd xmm4,xmm5 ; xmm4=tmp12L
psubd xmm0,xmm3 ; xmm0=tmp12H
; -- Final output stage
movdqa xmm5,xmm1
movdqa xmm3,xmm2
paddd xmm1,xmm6 ; xmm1=data0L
paddd xmm2,xmm7 ; xmm2=data0H
psubd xmm5,xmm6 ; xmm5=data3L
psubd xmm3,xmm7 ; xmm3=data3H
movdqa xmm6,[GOTOFF(ebx,PD_DESCALE_P1_4)] ; xmm6=[PD_DESCALE_P1_4]
paddd xmm1,xmm6
paddd xmm2,xmm6
psrad xmm1,DESCALE_P1_4
psrad xmm2,DESCALE_P1_4
paddd xmm5,xmm6
paddd xmm3,xmm6
psrad xmm5,DESCALE_P1_4
psrad xmm3,DESCALE_P1_4
packssdw xmm1,xmm2 ; xmm1=data0=(00 01 02 03 04 05 06 07)
packssdw xmm5,xmm3 ; xmm5=data3=(30 31 32 33 34 35 36 37)
movdqa xmm7, XMMWORD [wk(0)] ; xmm7=tmp0L
movdqa xmm6, XMMWORD [wk(1)] ; xmm6=tmp0H
movdqa xmm2,xmm4
movdqa xmm3,xmm0
paddd xmm4,xmm7 ; xmm4=data1L
paddd xmm0,xmm6 ; xmm0=data1H
psubd xmm2,xmm7 ; xmm2=data2L
psubd xmm3,xmm6 ; xmm3=data2H
movdqa xmm7,[GOTOFF(ebx,PD_DESCALE_P1_4)] ; xmm7=[PD_DESCALE_P1_4]
paddd xmm4,xmm7
paddd xmm0,xmm7
psrad xmm4,DESCALE_P1_4
psrad xmm0,DESCALE_P1_4
paddd xmm2,xmm7
paddd xmm3,xmm7
psrad xmm2,DESCALE_P1_4
psrad xmm3,DESCALE_P1_4
packssdw xmm4,xmm0 ; xmm4=data1=(10 11 12 13 14 15 16 17)
packssdw xmm2,xmm3 ; xmm2=data2=(20 21 22 23 24 25 26 27)
movdqa xmm6,xmm1 ; transpose coefficients(phase 1)
punpcklwd xmm1,xmm4 ; xmm1=(00 10 01 11 02 12 03 13)
punpckhwd xmm6,xmm4 ; xmm6=(04 14 05 15 06 16 07 17)
movdqa xmm7,xmm2 ; transpose coefficients(phase 1)
punpcklwd xmm2,xmm5 ; xmm2=(20 30 21 31 22 32 23 33)
punpckhwd xmm7,xmm5 ; xmm7=(24 34 25 35 26 36 27 37)
movdqa xmm0,xmm1 ; transpose coefficients(phase 2)
punpckldq xmm1,xmm2 ; xmm1=[col0 col1]=(00 10 20 30 01 11 21 31)
punpckhdq xmm0,xmm2 ; xmm0=[col2 col3]=(02 12 22 32 03 13 23 33)
movdqa xmm3,xmm6 ; transpose coefficients(phase 2)
punpckldq xmm6,xmm7 ; xmm6=[col4 col5]=(04 14 24 34 05 15 25 35)
punpckhdq xmm3,xmm7 ; xmm3=[col6 col7]=(06 16 26 36 07 17 27 37)
.column_end:
; -- Prefetch the next coefficient block
prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 0*32]
prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 1*32]
prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 2*32]
prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 3*32]
; ---- Pass 2: process rows, store into output array.
mov eax, [original_ebp]
mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *)
mov eax, JDIMENSION [output_col(eax)]
; -- Even part
pxor xmm4,xmm4
punpcklwd xmm4,xmm1 ; xmm4=tmp0
psrad xmm4,(16-CONST_BITS-1) ; psrad xmm4,16 & pslld xmm4,CONST_BITS+1
; -- Odd part
punpckhwd xmm1,xmm0
punpckhwd xmm6,xmm3
movdqa xmm5,xmm1
movdqa xmm2,xmm6
pmaddwd xmm1,[GOTOFF(ebx,PW_F256_F089)] ; xmm1=(tmp2)
pmaddwd xmm6,[GOTOFF(ebx,PW_MF060_MF050)] ; xmm6=(tmp2)
pmaddwd xmm5,[GOTOFF(ebx,PW_F106_MF217)] ; xmm5=(tmp0)
pmaddwd xmm2,[GOTOFF(ebx,PW_F145_MF021)] ; xmm2=(tmp0)
paddd xmm6,xmm1 ; xmm6=tmp2
paddd xmm2,xmm5 ; xmm2=tmp0
; -- Even part
punpcklwd xmm0,xmm3
pmaddwd xmm0,[GOTOFF(ebx,PW_F184_MF076)] ; xmm0=tmp2
movdqa xmm7,xmm4
paddd xmm4,xmm0 ; xmm4=tmp10
psubd xmm7,xmm0 ; xmm7=tmp12
; -- Final output stage
movdqa xmm1,[GOTOFF(ebx,PD_DESCALE_P2_4)] ; xmm1=[PD_DESCALE_P2_4]
movdqa xmm5,xmm4
movdqa xmm3,xmm7
paddd xmm4,xmm6 ; xmm4=data0=(00 10 20 30)
paddd xmm7,xmm2 ; xmm7=data1=(01 11 21 31)
psubd xmm5,xmm6 ; xmm5=data3=(03 13 23 33)
psubd xmm3,xmm2 ; xmm3=data2=(02 12 22 32)
paddd xmm4,xmm1
paddd xmm7,xmm1
psrad xmm4,DESCALE_P2_4
psrad xmm7,DESCALE_P2_4
paddd xmm5,xmm1
paddd xmm3,xmm1
psrad xmm5,DESCALE_P2_4
psrad xmm3,DESCALE_P2_4
packssdw xmm4,xmm3 ; xmm4=(00 10 20 30 02 12 22 32)
packssdw xmm7,xmm5 ; xmm7=(01 11 21 31 03 13 23 33)
movdqa xmm0,xmm4 ; transpose coefficients(phase 1)
punpcklwd xmm4,xmm7 ; xmm4=(00 01 10 11 20 21 30 31)
punpckhwd xmm0,xmm7 ; xmm0=(02 03 12 13 22 23 32 33)
movdqa xmm6,xmm4 ; transpose coefficients(phase 2)
punpckldq xmm4,xmm0 ; xmm4=(00 01 02 03 10 11 12 13)
punpckhdq xmm6,xmm0 ; xmm6=(20 21 22 23 30 31 32 33)
packsswb xmm4,xmm6 ; xmm4=(00 01 02 03 10 11 12 13 20 ..)
paddb xmm4,[GOTOFF(ebx,PB_CENTERJSAMP)]
pshufd xmm2,xmm4,0x39 ; xmm2=(10 11 12 13 20 21 22 23 30 ..)
pshufd xmm1,xmm4,0x4E ; xmm1=(20 21 22 23 30 31 32 33 00 ..)
pshufd xmm3,xmm4,0x93 ; xmm3=(30 31 32 33 00 01 02 03 10 ..)
mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
mov esi, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
movd XMM_DWORD [edx+eax*SIZEOF_JSAMPLE], xmm4
movd XMM_DWORD [esi+eax*SIZEOF_JSAMPLE], xmm2
mov edx, JSAMPROW [edi+2*SIZEOF_JSAMPROW]
mov esi, JSAMPROW [edi+3*SIZEOF_JSAMPROW]
movd XMM_DWORD [edx+eax*SIZEOF_JSAMPLE], xmm1
movd XMM_DWORD [esi+eax*SIZEOF_JSAMPLE], xmm3
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; unused
poppic ebx
mov esp,ebp ; esp <- aligned ebp
pop esp ; esp <- original ebp
pop ebp
ret
; --------------------------------------------------------------------------
;
; Perform dequantization and inverse DCT on one block of coefficients,
; producing a reduced-size 2x2 output block.
;
; GLOBAL(void)
; jsimd_idct_2x2_sse2 (void * dct_table, JCOEFPTR coef_block,
; JSAMPARRAY output_buf, JDIMENSION output_col)
;
%define dct_table(b) (b)+8 ; void * dct_table
%define coef_block(b) (b)+12 ; JCOEFPTR coef_block
%define output_buf(b) (b)+16 ; JSAMPARRAY output_buf
%define output_col(b) (b)+20 ; JDIMENSION output_col
align 16
global EXTN(jsimd_idct_2x2_sse2)
EXTN(jsimd_idct_2x2_sse2):
push ebp
mov ebp,esp
push ebx
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
get_GOT ebx ; get GOT address
; ---- Pass 1: process columns from input.
mov edx, POINTER [dct_table(ebp)] ; quantptr
mov esi, JCOEFPTR [coef_block(ebp)] ; inptr
; | input: | result: |
; | 00 01 ** 03 ** 05 ** 07 | |
; | 10 11 ** 13 ** 15 ** 17 | |
; | ** ** ** ** ** ** ** ** | |
; | 30 31 ** 33 ** 35 ** 37 | A0 A1 A3 A5 A7 |
; | ** ** ** ** ** ** ** ** | B0 B1 B3 B5 B7 |
; | 50 51 ** 53 ** 55 ** 57 | |
; | ** ** ** ** ** ** ** ** | |
; | 70 71 ** 73 ** 75 ** 77 | |
; -- Odd part
movdqa xmm0, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movdqa xmm1, XMMWORD [XMMBLOCK(3,0,esi,SIZEOF_JCOEF)]
pmullw xmm0, XMMWORD [XMMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw xmm1, XMMWORD [XMMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movdqa xmm2, XMMWORD [XMMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movdqa xmm3, XMMWORD [XMMBLOCK(7,0,esi,SIZEOF_JCOEF)]
pmullw xmm2, XMMWORD [XMMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw xmm3, XMMWORD [XMMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
; xmm0=(10 11 ** 13 ** 15 ** 17), xmm1=(30 31 ** 33 ** 35 ** 37)
; xmm2=(50 51 ** 53 ** 55 ** 57), xmm3=(70 71 ** 73 ** 75 ** 77)
pcmpeqd xmm7,xmm7
pslld xmm7,WORD_BIT ; xmm7={0x0000 0xFFFF 0x0000 0xFFFF ..}
movdqa xmm4,xmm0 ; xmm4=(10 11 ** 13 ** 15 ** 17)
movdqa xmm5,xmm2 ; xmm5=(50 51 ** 53 ** 55 ** 57)
punpcklwd xmm4,xmm1 ; xmm4=(10 30 11 31 ** ** 13 33)
punpcklwd xmm5,xmm3 ; xmm5=(50 70 51 71 ** ** 53 73)
pmaddwd xmm4,[GOTOFF(ebx,PW_F362_MF127)]
pmaddwd xmm5,[GOTOFF(ebx,PW_F085_MF072)]
psrld xmm0,WORD_BIT ; xmm0=(11 -- 13 -- 15 -- 17 --)
pand xmm1,xmm7 ; xmm1=(-- 31 -- 33 -- 35 -- 37)
psrld xmm2,WORD_BIT ; xmm2=(51 -- 53 -- 55 -- 57 --)
pand xmm3,xmm7 ; xmm3=(-- 71 -- 73 -- 75 -- 77)
por xmm0,xmm1 ; xmm0=(11 31 13 33 15 35 17 37)
por xmm2,xmm3 ; xmm2=(51 71 53 73 55 75 57 77)
pmaddwd xmm0,[GOTOFF(ebx,PW_F362_MF127)]
pmaddwd xmm2,[GOTOFF(ebx,PW_F085_MF072)]
paddd xmm4,xmm5 ; xmm4=tmp0[col0 col1 **** col3]
paddd xmm0,xmm2 ; xmm0=tmp0[col1 col3 col5 col7]
; -- Even part
movdqa xmm6, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_JCOEF)]
pmullw xmm6, XMMWORD [XMMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
; xmm6=(00 01 ** 03 ** 05 ** 07)
movdqa xmm1,xmm6 ; xmm1=(00 01 ** 03 ** 05 ** 07)
pslld xmm6,WORD_BIT ; xmm6=(-- 00 -- ** -- ** -- **)
pand xmm1,xmm7 ; xmm1=(-- 01 -- 03 -- 05 -- 07)
psrad xmm6,(WORD_BIT-CONST_BITS-2) ; xmm6=tmp10[col0 **** **** ****]
psrad xmm1,(WORD_BIT-CONST_BITS-2) ; xmm1=tmp10[col1 col3 col5 col7]
; -- Final output stage
movdqa xmm3,xmm6
movdqa xmm5,xmm1
paddd xmm6,xmm4 ; xmm6=data0[col0 **** **** ****]=(A0 ** ** **)
paddd xmm1,xmm0 ; xmm1=data0[col1 col3 col5 col7]=(A1 A3 A5 A7)
psubd xmm3,xmm4 ; xmm3=data1[col0 **** **** ****]=(B0 ** ** **)
psubd xmm5,xmm0 ; xmm5=data1[col1 col3 col5 col7]=(B1 B3 B5 B7)
movdqa xmm2,[GOTOFF(ebx,PD_DESCALE_P1_2)] ; xmm2=[PD_DESCALE_P1_2]
punpckldq xmm6,xmm3 ; xmm6=(A0 B0 ** **)
movdqa xmm7,xmm1
punpcklqdq xmm1,xmm5 ; xmm1=(A1 A3 B1 B3)
punpckhqdq xmm7,xmm5 ; xmm7=(A5 A7 B5 B7)
paddd xmm6,xmm2
psrad xmm6,DESCALE_P1_2
paddd xmm1,xmm2
paddd xmm7,xmm2
psrad xmm1,DESCALE_P1_2
psrad xmm7,DESCALE_P1_2
; -- Prefetch the next coefficient block
prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 0*32]
prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 1*32]
prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 2*32]
prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 3*32]
; ---- Pass 2: process rows, store into output array.
mov edi, JSAMPARRAY [output_buf(ebp)] ; (JSAMPROW *)
mov eax, JDIMENSION [output_col(ebp)]
; | input:| result:|
; | A0 B0 | |
; | A1 B1 | C0 C1 |
; | A3 B3 | D0 D1 |
; | A5 B5 | |
; | A7 B7 | |
; -- Odd part
packssdw xmm1,xmm1 ; xmm1=(A1 A3 B1 B3 A1 A3 B1 B3)
packssdw xmm7,xmm7 ; xmm7=(A5 A7 B5 B7 A5 A7 B5 B7)
pmaddwd xmm1,[GOTOFF(ebx,PW_F362_MF127)]
pmaddwd xmm7,[GOTOFF(ebx,PW_F085_MF072)]
paddd xmm1,xmm7 ; xmm1=tmp0[row0 row1 row0 row1]
; -- Even part
pslld xmm6,(CONST_BITS+2) ; xmm6=tmp10[row0 row1 **** ****]
; -- Final output stage
movdqa xmm4,xmm6
paddd xmm6,xmm1 ; xmm6=data0[row0 row1 **** ****]=(C0 C1 ** **)
psubd xmm4,xmm1 ; xmm4=data1[row0 row1 **** ****]=(D0 D1 ** **)
punpckldq xmm6,xmm4 ; xmm6=(C0 D0 C1 D1)
paddd xmm6,[GOTOFF(ebx,PD_DESCALE_P2_2)]
psrad xmm6,DESCALE_P2_2
packssdw xmm6,xmm6 ; xmm6=(C0 D0 C1 D1 C0 D0 C1 D1)
packsswb xmm6,xmm6 ; xmm6=(C0 D0 C1 D1 C0 D0 C1 D1 ..)
paddb xmm6,[GOTOFF(ebx,PB_CENTERJSAMP)]
pextrw ebx,xmm6,0x00 ; ebx=(C0 D0 -- --)
pextrw ecx,xmm6,0x01 ; ecx=(C1 D1 -- --)
mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
mov esi, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
mov WORD [edx+eax*SIZEOF_JSAMPLE], bx
mov WORD [esi+eax*SIZEOF_JSAMPLE], cx
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