;
; jidctred.asm - reduced-size IDCT (MMX)
;
; 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_mmx)
EXTN(jconst_idct_red_mmx):
PW_F184_MF076 times 2 dw F_1_847,-F_0_765
PW_F256_F089 times 2 dw F_2_562, F_0_899
PW_F106_MF217 times 2 dw F_1_061,-F_2_172
PW_MF060_MF050 times 2 dw -F_0_601,-F_0_509
PW_F145_MF021 times 2 dw F_1_451,-F_0_211
PW_F362_MF127 times 2 dw F_3_624,-F_1_272
PW_F085_MF072 times 2 dw F_0_850,-F_0_720
PD_DESCALE_P1_4 times 2 dd 1 << (DESCALE_P1_4-1)
PD_DESCALE_P2_4 times 2 dd 1 << (DESCALE_P2_4-1)
PD_DESCALE_P1_2 times 2 dd 1 << (DESCALE_P1_2-1)
PD_DESCALE_P2_2 times 2 dd 1 << (DESCALE_P2_2-1)
PB_CENTERJSAMP times 8 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_mmx (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_MMWORD ; mmword wk[WK_NUM]
%define WK_NUM 2
%define workspace wk(0)-DCTSIZE2*SIZEOF_JCOEF
; JCOEF workspace[DCTSIZE2]
align 16
global EXTN(jsimd_idct_4x4_mmx)
EXTN(jsimd_idct_4x4_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, [workspace]
pushpic 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, store into work array.
; mov eax, [original_ebp]
mov edx, POINTER [dct_table(eax)] ; quantptr
mov esi, JCOEFPTR [coef_block(eax)] ; inptr
lea edi, [workspace] ; JCOEF * wsptr
mov ecx, DCTSIZE/4 ; ctr
alignx 16,7
.columnloop:
%ifndef NO_ZERO_COLUMN_TEST_4X4_MMX
mov eax, DWORD [DWBLOCK(1,0,esi,SIZEOF_JCOEF)]
or eax, DWORD [DWBLOCK(2,0,esi,SIZEOF_JCOEF)]
jnz short .columnDCT
movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
por mm0, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
por mm1, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
por mm0, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
por mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
por mm0,mm1
packsswb mm0,mm0
movd eax,mm0
test eax,eax
jnz short .columnDCT
; -- AC terms all zero
movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
psllw mm0,PASS1_BITS
movq mm2,mm0 ; mm0=in0=(00 01 02 03)
punpcklwd mm0,mm0 ; mm0=(00 00 01 01)
punpckhwd mm2,mm2 ; mm2=(02 02 03 03)
movq mm1,mm0
punpckldq mm0,mm0 ; mm0=(00 00 00 00)
punpckhdq mm1,mm1 ; mm1=(01 01 01 01)
movq mm3,mm2
punpckldq mm2,mm2 ; mm2=(02 02 02 02)
punpckhdq mm3,mm3 ; mm3=(03 03 03 03)
movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm0
movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2
movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3
jmp near .nextcolumn
alignx 16,7
%endif
.columnDCT:
; -- Odd part
movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
pmullw mm0, MMWORD [MMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
pmullw mm2, MMWORD [MMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm4,mm0
movq mm5,mm0
punpcklwd mm4,mm1
punpckhwd mm5,mm1
movq mm0,mm4
movq mm1,mm5
pmaddwd mm4,[GOTOFF(ebx,PW_F256_F089)] ; mm4=(tmp2L)
pmaddwd mm5,[GOTOFF(ebx,PW_F256_F089)] ; mm5=(tmp2H)
pmaddwd mm0,[GOTOFF(ebx,PW_F106_MF217)] ; mm0=(tmp0L)
pmaddwd mm1,[GOTOFF(ebx,PW_F106_MF217)] ; mm1=(tmp0H)
movq mm6,mm2
movq mm7,mm2
punpcklwd mm6,mm3
punpckhwd mm7,mm3
movq mm2,mm6
movq mm3,mm7
pmaddwd mm6,[GOTOFF(ebx,PW_MF060_MF050)] ; mm6=(tmp2L)
pmaddwd mm7,[GOTOFF(ebx,PW_MF060_MF050)] ; mm7=(tmp2H)
pmaddwd mm2,[GOTOFF(ebx,PW_F145_MF021)] ; mm2=(tmp0L)
pmaddwd mm3,[GOTOFF(ebx,PW_F145_MF021)] ; mm3=(tmp0H)
paddd mm6,mm4 ; mm6=tmp2L
paddd mm7,mm5 ; mm7=tmp2H
paddd mm2,mm0 ; mm2=tmp0L
paddd mm3,mm1 ; mm3=tmp0H
movq MMWORD [wk(0)], mm2 ; wk(0)=tmp0L
movq MMWORD [wk(1)], mm3 ; wk(1)=tmp0H
; -- Even part
movq mm4, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movq mm5, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
movq mm0, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
pmullw mm4, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm5, MMWORD [MMBLOCK(2,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm0, MMWORD [MMBLOCK(6,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pxor mm1,mm1
pxor mm2,mm2
punpcklwd mm1,mm4 ; mm1=tmp0L
punpckhwd mm2,mm4 ; mm2=tmp0H
psrad mm1,(16-CONST_BITS-1) ; psrad mm1,16 & pslld mm1,CONST_BITS+1
psrad mm2,(16-CONST_BITS-1) ; psrad mm2,16 & pslld mm2,CONST_BITS+1
movq mm3,mm5 ; mm5=in2=z2
punpcklwd mm5,mm0 ; mm0=in6=z3
punpckhwd mm3,mm0
pmaddwd mm5,[GOTOFF(ebx,PW_F184_MF076)] ; mm5=tmp2L
pmaddwd mm3,[GOTOFF(ebx,PW_F184_MF076)] ; mm3=tmp2H
movq mm4,mm1
movq mm0,mm2
paddd mm1,mm5 ; mm1=tmp10L
paddd mm2,mm3 ; mm2=tmp10H
psubd mm4,mm5 ; mm4=tmp12L
psubd mm0,mm3 ; mm0=tmp12H
; -- Final output stage
movq mm5,mm1
movq mm3,mm2
paddd mm1,mm6 ; mm1=data0L
paddd mm2,mm7 ; mm2=data0H
psubd mm5,mm6 ; mm5=data3L
psubd mm3,mm7 ; mm3=data3H
movq mm6,[GOTOFF(ebx,PD_DESCALE_P1_4)] ; mm6=[PD_DESCALE_P1_4]
paddd mm1,mm6
paddd mm2,mm6
psrad mm1,DESCALE_P1_4
psrad mm2,DESCALE_P1_4
paddd mm5,mm6
paddd mm3,mm6
psrad mm5,DESCALE_P1_4
psrad mm3,DESCALE_P1_4
packssdw mm1,mm2 ; mm1=data0=(00 01 02 03)
packssdw mm5,mm3 ; mm5=data3=(30 31 32 33)
movq mm7, MMWORD [wk(0)] ; mm7=tmp0L
movq mm6, MMWORD [wk(1)] ; mm6=tmp0H
movq mm2,mm4
movq mm3,mm0
paddd mm4,mm7 ; mm4=data1L
paddd mm0,mm6 ; mm0=data1H
psubd mm2,mm7 ; mm2=data2L
psubd mm3,mm6 ; mm3=data2H
movq mm7,[GOTOFF(ebx,PD_DESCALE_P1_4)] ; mm7=[PD_DESCALE_P1_4]
paddd mm4,mm7
paddd mm0,mm7
psrad mm4,DESCALE_P1_4
psrad mm0,DESCALE_P1_4
paddd mm2,mm7
paddd mm3,mm7
psrad mm2,DESCALE_P1_4
psrad mm3,DESCALE_P1_4
packssdw mm4,mm0 ; mm4=data1=(10 11 12 13)
packssdw mm2,mm3 ; mm2=data2=(20 21 22 23)
movq mm6,mm1 ; transpose coefficients(phase 1)
punpcklwd mm1,mm4 ; mm1=(00 10 01 11)
punpckhwd mm6,mm4 ; mm6=(02 12 03 13)
movq mm7,mm2 ; transpose coefficients(phase 1)
punpcklwd mm2,mm5 ; mm2=(20 30 21 31)
punpckhwd mm7,mm5 ; mm7=(22 32 23 33)
movq mm0,mm1 ; transpose coefficients(phase 2)
punpckldq mm1,mm2 ; mm1=(00 10 20 30)
punpckhdq mm0,mm2 ; mm0=(01 11 21 31)
movq mm3,mm6 ; transpose coefficients(phase 2)
punpckldq mm6,mm7 ; mm6=(02 12 22 32)
punpckhdq mm3,mm7 ; mm3=(03 13 23 33)
movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm0
movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm6
movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3
.nextcolumn:
add esi, byte 4*SIZEOF_JCOEF ; coef_block
add edx, byte 4*SIZEOF_ISLOW_MULT_TYPE ; quantptr
add edi, byte 4*DCTSIZE*SIZEOF_JCOEF ; wsptr
dec ecx ; ctr
jnz near .columnloop
; ---- Pass 2: process rows from work array, store into output array.
mov eax, [original_ebp]
lea esi, [workspace] ; JCOEF * wsptr
mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *)
mov eax, JDIMENSION [output_col(eax)]
; -- Odd part
movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
movq mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
movq mm4,mm0
movq mm5,mm0
punpcklwd mm4,mm1
punpckhwd mm5,mm1
movq mm0,mm4
movq mm1,mm5
pmaddwd mm4,[GOTOFF(ebx,PW_F256_F089)] ; mm4=(tmp2L)
pmaddwd mm5,[GOTOFF(ebx,PW_F256_F089)] ; mm5=(tmp2H)
pmaddwd mm0,[GOTOFF(ebx,PW_F106_MF217)] ; mm0=(tmp0L)
pmaddwd mm1,[GOTOFF(ebx,PW_F106_MF217)] ; mm1=(tmp0H)
movq mm6,mm2
movq mm7,mm2
punpcklwd mm6,mm3
punpckhwd mm7,mm3
movq mm2,mm6
movq mm3,mm7
pmaddwd mm6,[GOTOFF(ebx,PW_MF060_MF050)] ; mm6=(tmp2L)
pmaddwd mm7,[GOTOFF(ebx,PW_MF060_MF050)] ; mm7=(tmp2H)
pmaddwd mm2,[GOTOFF(ebx,PW_F145_MF021)] ; mm2=(tmp0L)
pmaddwd mm3,[GOTOFF(ebx,PW_F145_MF021)] ; mm3=(tmp0H)
paddd mm6,mm4 ; mm6=tmp2L
paddd mm7,mm5 ; mm7=tmp2H
paddd mm2,mm0 ; mm2=tmp0L
paddd mm3,mm1 ; mm3=tmp0H
movq MMWORD [wk(0)], mm2 ; wk(0)=tmp0L
movq MMWORD [wk(1)], mm3 ; wk(1)=tmp0H
; -- Even part
movq mm4, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movq mm5, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
movq mm0, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
pxor mm1,mm1
pxor mm2,mm2
punpcklwd mm1,mm4 ; mm1=tmp0L
punpckhwd mm2,mm4 ; mm2=tmp0H
psrad mm1,(16-CONST_BITS-1) ; psrad mm1,16 & pslld mm1,CONST_BITS+1
psrad mm2,(16-CONST_BITS-1) ; psrad mm2,16 & pslld mm2,CONST_BITS+1
movq mm3,mm5 ; mm5=in2=z2
punpcklwd mm5,mm0 ; mm0=in6=z3
punpckhwd mm3,mm0
pmaddwd mm5,[GOTOFF(ebx,PW_F184_MF076)] ; mm5=tmp2L
pmaddwd mm3,[GOTOFF(ebx,PW_F184_MF076)] ; mm3=tmp2H
movq mm4,mm1
movq mm0,mm2
paddd mm1,mm5 ; mm1=tmp10L
paddd mm2,mm3 ; mm2=tmp10H
psubd mm4,mm5 ; mm4=tmp12L
psubd mm0,mm3 ; mm0=tmp12H
; -- Final output stage
movq mm5,mm1
movq mm3,mm2
paddd mm1,mm6 ; mm1=data0L
paddd mm2,mm7 ; mm2=data0H
psubd mm5,mm6 ; mm5=data3L
psubd mm3,mm7 ; mm3=data3H
movq mm6,[GOTOFF(ebx,PD_DESCALE_P2_4)] ; mm6=[PD_DESCALE_P2_4]
paddd mm1,mm6
paddd mm2,mm6
psrad mm1,DESCALE_P2_4
psrad mm2,DESCALE_P2_4
paddd mm5,mm6
paddd mm3,mm6
psrad mm5,DESCALE_P2_4
psrad mm3,DESCALE_P2_4
packssdw mm1,mm2 ; mm1=data0=(00 10 20 30)
packssdw mm5,mm3 ; mm5=data3=(03 13 23 33)
movq mm7, MMWORD [wk(0)] ; mm7=tmp0L
movq mm6, MMWORD [wk(1)] ; mm6=tmp0H
movq mm2,mm4
movq mm3,mm0
paddd mm4,mm7 ; mm4=data1L
paddd mm0,mm6 ; mm0=data1H
psubd mm2,mm7 ; mm2=data2L
psubd mm3,mm6 ; mm3=data2H
movq mm7,[GOTOFF(ebx,PD_DESCALE_P2_4)] ; mm7=[PD_DESCALE_P2_4]
paddd mm4,mm7
paddd mm0,mm7
psrad mm4,DESCALE_P2_4
psrad mm0,DESCALE_P2_4
paddd mm2,mm7
paddd mm3,mm7
psrad mm2,DESCALE_P2_4
psrad mm3,DESCALE_P2_4
packssdw mm4,mm0 ; mm4=data1=(01 11 21 31)
packssdw mm2,mm3 ; mm2=data2=(02 12 22 32)
movq mm6,[GOTOFF(ebx,PB_CENTERJSAMP)] ; mm6=[PB_CENTERJSAMP]
packsswb mm1,mm2 ; mm1=(00 10 20 30 02 12 22 32)
packsswb mm4,mm5 ; mm4=(01 11 21 31 03 13 23 33)
paddb mm1,mm6
paddb mm4,mm6
movq mm7,mm1 ; transpose coefficients(phase 1)
punpcklbw mm1,mm4 ; mm1=(00 01 10 11 20 21 30 31)
punpckhbw mm7,mm4 ; mm7=(02 03 12 13 22 23 32 33)
movq mm0,mm1 ; transpose coefficients(phase 2)
punpcklwd mm1,mm7 ; mm1=(00 01 02 03 10 11 12 13)
punpckhwd mm0,mm7 ; mm0=(20 21 22 23 30 31 32 33)
mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
mov esi, JSAMPROW [edi+2*SIZEOF_JSAMPROW]
movd DWORD [edx+eax*SIZEOF_JSAMPLE], mm1
movd DWORD [esi+eax*SIZEOF_JSAMPLE], mm0
psrlq mm1,4*BYTE_BIT
psrlq mm0,4*BYTE_BIT
mov edx, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
mov esi, JSAMPROW [edi+3*SIZEOF_JSAMPROW]
movd DWORD [edx+eax*SIZEOF_JSAMPLE], mm1
movd DWORD [esi+eax*SIZEOF_JSAMPLE], mm0
emms ; empty MMX state
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
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_mmx (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_mmx)
EXTN(jsimd_idct_2x2_mmx):
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
movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
pmullw mm0, MMWORD [MMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
pmullw mm2, MMWORD [MMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
; mm0=(10 11 ** 13), mm1=(30 31 ** 33)
; mm2=(50 51 ** 53), mm3=(70 71 ** 73)
pcmpeqd mm7,mm7
pslld mm7,WORD_BIT ; mm7={0x0000 0xFFFF 0x0000 0xFFFF}
movq mm4,mm0 ; mm4=(10 11 ** 13)
movq mm5,mm2 ; mm5=(50 51 ** 53)
punpcklwd mm4,mm1 ; mm4=(10 30 11 31)
punpcklwd mm5,mm3 ; mm5=(50 70 51 71)
pmaddwd mm4,[GOTOFF(ebx,PW_F362_MF127)]
pmaddwd mm5,[GOTOFF(ebx,PW_F085_MF072)]
psrld mm0,WORD_BIT ; mm0=(11 -- 13 --)
pand mm1,mm7 ; mm1=(-- 31 -- 33)
psrld mm2,WORD_BIT ; mm2=(51 -- 53 --)
pand mm3,mm7 ; mm3=(-- 71 -- 73)
por mm0,mm1 ; mm0=(11 31 13 33)
por mm2,mm3 ; mm2=(51 71 53 73)
pmaddwd mm0,[GOTOFF(ebx,PW_F362_MF127)]
pmaddwd mm2,[GOTOFF(ebx,PW_F085_MF072)]
paddd mm4,mm5 ; mm4=tmp0[col0 col1]
movq mm6, MMWORD [MMBLOCK(1,1,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(3,1,esi,SIZEOF_JCOEF)]
pmullw mm6, MMWORD [MMBLOCK(1,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm1, MMWORD [MMBLOCK(3,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm3, MMWORD [MMBLOCK(5,1,esi,SIZEOF_JCOEF)]
movq mm5, MMWORD [MMBLOCK(7,1,esi,SIZEOF_JCOEF)]
pmullw mm3, MMWORD [MMBLOCK(5,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm5, MMWORD [MMBLOCK(7,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
; mm6=(** 15 ** 17), mm1=(** 35 ** 37)
; mm3=(** 55 ** 57), mm5=(** 75 ** 77)
psrld mm6,WORD_BIT ; mm6=(15 -- 17 --)
pand mm1,mm7 ; mm1=(-- 35 -- 37)
psrld mm3,WORD_BIT ; mm3=(55 -- 57 --)
pand mm5,mm7 ; mm5=(-- 75 -- 77)
por mm6,mm1 ; mm6=(15 35 17 37)
por mm3,mm5 ; mm3=(55 75 57 77)
pmaddwd mm6,[GOTOFF(ebx,PW_F362_MF127)]
pmaddwd mm3,[GOTOFF(ebx,PW_F085_MF072)]
paddd mm0,mm2 ; mm0=tmp0[col1 col3]
paddd mm6,mm3 ; mm6=tmp0[col5 col7]
; -- Even part
movq mm1, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movq mm5, MMWORD [MMBLOCK(0,1,esi,SIZEOF_JCOEF)]
pmullw mm1, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm5, MMWORD [MMBLOCK(0,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
; mm1=(00 01 ** 03), mm5=(** 05 ** 07)
movq mm2,mm1 ; mm2=(00 01 ** 03)
pslld mm1,WORD_BIT ; mm1=(-- 00 -- **)
psrad mm1,(WORD_BIT-CONST_BITS-2) ; mm1=tmp10[col0 ****]
pand mm2,mm7 ; mm2=(-- 01 -- 03)
pand mm5,mm7 ; mm5=(-- 05 -- 07)
psrad mm2,(WORD_BIT-CONST_BITS-2) ; mm2=tmp10[col1 col3]
psrad mm5,(WORD_BIT-CONST_BITS-2) ; mm5=tmp10[col5 col7]
; -- Final output stage
movq mm3,mm1
paddd mm1,mm4 ; mm1=data0[col0 ****]=(A0 **)
psubd mm3,mm4 ; mm3=data1[col0 ****]=(B0 **)
punpckldq mm1,mm3 ; mm1=(A0 B0)
movq mm7,[GOTOFF(ebx,PD_DESCALE_P1_2)] ; mm7=[PD_DESCALE_P1_2]
movq mm4,mm2
movq mm3,mm5
paddd mm2,mm0 ; mm2=data0[col1 col3]=(A1 A3)
paddd mm5,mm6 ; mm5=data0[col5 col7]=(A5 A7)
psubd mm4,mm0 ; mm4=data1[col1 col3]=(B1 B3)
psubd mm3,mm6 ; mm3=data1[col5 col7]=(B5 B7)
paddd mm1,mm7
psrad mm1,DESCALE_P1_2
paddd mm2,mm7
paddd mm5,mm7
psrad mm2,DESCALE_P1_2
psrad mm5,DESCALE_P1_2
paddd mm4,mm7
paddd mm3,mm7
psrad mm4,DESCALE_P1_2
psrad mm3,DESCALE_P1_2
; ---- 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 mm2,mm4 ; mm2=(A1 A3 B1 B3)
packssdw mm5,mm3 ; mm5=(A5 A7 B5 B7)
pmaddwd mm2,[GOTOFF(ebx,PW_F362_MF127)]
pmaddwd mm5,[GOTOFF(ebx,PW_F085_MF072)]
paddd mm2,mm5 ; mm2=tmp0[row0 row1]
; -- Even part
pslld mm1,(CONST_BITS+2) ; mm1=tmp10[row0 row1]
; -- Final output stage
movq mm0,[GOTOFF(ebx,PD_DESCALE_P2_2)] ; mm0=[PD_DESCALE_P2_2]
movq mm6,mm1
paddd mm1,mm2 ; mm1=data0[row0 row1]=(C0 C1)
psubd mm6,mm2 ; mm6=data1[row0 row1]=(D0 D1)
paddd mm1,mm0
paddd mm6,mm0
psrad mm1,DESCALE_P2_2
psrad mm6,DESCALE_P2_2
movq mm7,mm1 ; transpose coefficients
punpckldq mm1,mm6 ; mm1=(C0 D0)
punpckhdq mm7,mm6 ; mm7=(C1 D1)
packssdw mm1,mm7 ; mm1=(C0 D0 C1 D1)
packsswb mm1,mm1 ; mm1=(C0 D0 C1 D1 C0 D0 C1 D1)
paddb mm1,[GOTOFF(ebx,PB_CENTERJSAMP)]
movd ecx,mm1
movd ebx,mm1 ; ebx=(C0 D0 C1 D1)
shr ecx,2*BYTE_BIT ; 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
emms ; empty MMX state
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