📄 idctmmx.asm
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;
; idct8x8_xmm.asm
;
; Originally provided by Intel at AP-922
; http://developer.intel.com/vtune/cbts/strmsimd/922down.htm
; (See more app notes at http://developer.intel.com/vtune/cbts/strmsimd/appnotes.htm)
; but in a limited edition.
; New macro implements a column part for precise iDCT
; The routine precision now satisfies IEEE standard 1180-1990.
;
; Copyright (c) 2000-2001 Peter Gubanov <peter@elecard.net.ru>
; Rounding trick Copyright (c) 2000 Michel Lespinasse <walken@zoy.org>
;
; http://www.elecard.com/peter/idct.html
; http://www.linuxvideo.org/mpeg2dec/
;
;=============================================================================
;
; These examples contain code fragments for first stage iDCT 8x8
; (for rows) and first stage DCT 8x8 (for columns)
;
;=============================================================================
mword typedef qword
mptr equ mword ptr
BITS_INV_ACC = 5 ; 4 or 5 for IEEE
SHIFT_INV_ROW = 16 - BITS_INV_ACC
SHIFT_INV_COL = 1 + BITS_INV_ACC
RND_INV_ROW = 1024 * (6 - BITS_INV_ACC) ; 1 << (SHIFT_INV_ROW-1)
RND_INV_COL = 16 * (BITS_INV_ACC - 3) ; 1 << (SHIFT_INV_COL-1)
RND_INV_CORR = RND_INV_COL - 1 ; correction -1.0 and round
BITS_FRW_ACC = 3 ; 2 or 3 for accuracy
SHIFT_FRW_COL = BITS_FRW_ACC
SHIFT_FRW_ROW = BITS_FRW_ACC + 17
RND_FRW_ROW = 262144 * (BITS_FRW_ACC - 1) ; 1 << (SHIFT_FRW_ROW-1)
_MMX = 1
.nolist
.586
if @version GE 612
.mmx
mmword TEXTEQU <QWORD>
else
include IAMMX.INC
endif
if @version GE 614
.xmm
mm2word TEXTEQU <QWORD> ; needed for Streaming SIMD Extensions macros
else
include iaxmm.inc ; Streaming SIMD Extensions Emulator Macros
endif
.list
.model flat
_DATA SEGMENT PARA PUBLIC USE32 'DATA'
one_corr sword 1, 1, 1, 1
round_inv_row dword RND_INV_ROW, RND_INV_ROW
round_inv_col sword RND_INV_COL, RND_INV_COL, RND_INV_COL, RND_INV_COL
round_inv_corr sword RND_INV_CORR, RND_INV_CORR, RND_INV_CORR, RND_INV_CORR
round_frw_row dword RND_FRW_ROW, RND_FRW_ROW
tg_1_16 sword 13036, 13036, 13036, 13036 ; tg * (2<<16) + 0.5
tg_2_16 sword 27146, 27146, 27146, 27146 ; tg * (2<<16) + 0.5
tg_3_16 sword -21746, -21746, -21746, -21746 ; tg * (2<<16) + 0.5
cos_4_16 sword -19195, -19195, -19195, -19195 ; cos * (2<<16) + 0.5
ocos_4_16 sword 23170, 23170, 23170, 23170 ; cos * (2<<15) + 0.5
otg_3_16 sword 21895, 21895, 21895, 21895 ; tg * (2<<16) + 0.5
; assume SHIFT_INV_ROW == 12
;rounder_0 dword 65536, 65536
;rounder_4 dword 0, 0
;rounder_1 dword 7195, 7195
;rounder_7 dword 1024, 1024
;rounder_2 dword 4520, 4520
;rounder_6 dword 1024, 1024
;rounder_3 dword 2407, 2407
;rounder_5 dword 240, 240
; assume SHIFT_INV_ROW == 11
rounder_0 dword 65536, 65536
rounder_4 dword 0, 0
rounder_1 dword 3597, 3597
rounder_7 dword 512, 512
rounder_2 dword 2260, 2260
rounder_6 dword 512, 512
rounder_3 dword 1203, 1203
rounder_5 dword 120, 120
;=============================================================================
;
; The first stage iDCT 8x8 - inverse DCTs of rows
;
;-----------------------------------------------------------------------------
; The 8-point inverse DCT direct algorithm
;-----------------------------------------------------------------------------
;
; static const short w[32] = {
; FIX(cos_4_16), FIX(cos_2_16), FIX(cos_4_16), FIX(cos_6_16),
; FIX(cos_4_16), FIX(cos_6_16), -FIX(cos_4_16), -FIX(cos_2_16),
; FIX(cos_4_16), -FIX(cos_6_16), -FIX(cos_4_16), FIX(cos_2_16),
; FIX(cos_4_16), -FIX(cos_2_16), FIX(cos_4_16), -FIX(cos_6_16),
; FIX(cos_1_16), FIX(cos_3_16), FIX(cos_5_16), FIX(cos_7_16),
; FIX(cos_3_16), -FIX(cos_7_16), -FIX(cos_1_16), -FIX(cos_5_16),
; FIX(cos_5_16), -FIX(cos_1_16), FIX(cos_7_16), FIX(cos_3_16),
; FIX(cos_7_16), -FIX(cos_5_16), FIX(cos_3_16), -FIX(cos_1_16) };
;
; #define DCT_8_INV_ROW(x, y)
; {
; int a0, a1, a2, a3, b0, b1, b2, b3;
;
; a0 =x[0]*w[0]+x[2]*w[1]+x[4]*w[2]+x[6]*w[3];
; a1 =x[0]*w[4]+x[2]*w[5]+x[4]*w[6]+x[6]*w[7];
; a2 = x[0] * w[ 8] + x[2] * w[ 9] + x[4] * w[10] + x[6] * w[11];
; a3 = x[0] * w[12] + x[2] * w[13] + x[4] * w[14] + x[6] * w[15];
; b0 = x[1] * w[16] + x[3] * w[17] + x[5] * w[18] + x[7] * w[19];
; b1 = x[1] * w[20] + x[3] * w[21] + x[5] * w[22] + x[7] * w[23];
; b2 = x[1] * w[24] + x[3] * w[25] + x[5] * w[26] + x[7] * w[27];
; b3 = x[1] * w[28] + x[3] * w[29] + x[5] * w[30] + x[7] * w[31];
;
; y[0] = SHIFT_ROUND ( a0 + b0 );
; y[1] = SHIFT_ROUND ( a1 + b1 );
; y[2] = SHIFT_ROUND ( a2 + b2 );
; y[3] = SHIFT_ROUND ( a3 + b3 );
; y[4] = SHIFT_ROUND ( a3 - b3 );
; y[5] = SHIFT_ROUND ( a2 - b2 );
; y[6] = SHIFT_ROUND ( a1 - b1 );
; y[7] = SHIFT_ROUND ( a0 - b0 );
; }
;
;-----------------------------------------------------------------------------
;
; In this implementation the outputs of the iDCT-1D are multiplied
; for rows 0,4 - by cos_4_16,
; for rows 1,7 - by cos_1_16,
; for rows 2,6 - by cos_2_16,
; for rows 3,5 - by cos_3_16
; and are shifted to the left for better accuracy
;
; For the constants used,
; FIX(float_const) = (short) (float_const * (1<<15) + 0.5)
;
;=============================================================================
;=============================================================================
; MMX code
;=============================================================================
; Table for rows 0,4 - constants are multiplied by cos_4_16
tab_i_04 sword 16384, 16384, 16384, -16384 ; movq-> w06 w04 w02 w00
sword 21407, 8867, 8867, -21407 ; w07 w05 w03 w01
sword 16384, -16384, 16384, 16384 ; w14 w12 w10 w08
sword -8867, 21407, -21407, -8867 ; w15 w13 w11 w09
sword 22725, 12873, 19266, -22725 ; w22 w20 w18 w16
sword 19266, 4520, -4520, -12873 ; w23 w21 w19 w17
sword 12873, 4520, 4520, 19266 ; w30 w28 w26 w24
sword -22725, 19266, -12873, -22725 ; w31 w29 w27 w25
; Table for rows 1,7 - constants are multiplied by cos_1_16
tab_i_17 sword 22725, 22725, 22725, -22725 ; movq-> w06 w04 w02 w00
sword 29692, 12299, 12299, -29692 ; w07 w05 w03 w01
sword 22725, -22725, 22725, 22725 ; w14 w12 w10 w08
sword -12299, 29692, -29692, -12299 ; w15 w13 w11 w09
sword 31521, 17855, 26722, -31521 ; w22 w20 w18 w16
sword 26722, 6270, -6270, -17855 ; w23 w21 w19 w17
sword 17855, 6270, 6270, 26722 ; w30 w28 w26 w24
sword -31521, 26722, -17855, -31521 ; w31 w29 w27 w25
; Table for rows 2,6 - constants are multiplied by cos_2_16
tab_i_26 sword 21407, 21407, 21407, -21407 ; movq-> w06 w04 w02 w00
sword 27969, 11585, 11585, -27969 ; w07 w05 w03 w01
sword 21407, -21407, 21407, 21407 ; w14 w12 w10 w08
sword -11585, 27969, -27969, -11585 ; w15 w13 w11 w09
sword 29692, 16819, 25172, -29692 ; w22 w20 w18 w16
sword 25172, 5906, -5906, -16819 ; w23 w21 w19 w17
sword 16819, 5906, 5906, 25172 ; w30 w28 w26 w24
sword -29692, 25172, -16819, -29692 ; w31 w29 w27 w25
; Table for rows 3,5 - constants are multiplied by cos_3_16
tab_i_35 sword 19266, 19266, 19266, -19266 ; movq-> w06 w04 w02 w00
sword 25172, 10426, 10426, -25172 ; w07 w05 w03 w01
sword 19266, -19266, 19266, 19266 ; w14 w12 w10 w08
sword -10426, 25172, -25172, -10426 ; w15 w13 w11 w09
sword 26722, 15137, 22654, -26722 ; w22 w20 w18 w16
sword 22654, 5315, -5315, -15137 ; w23 w21 w19 w17
sword 15137, 5315, 5315, 22654 ; w30 w28 w26 w24
sword -26722, 22654, -15137, -26722 ; w31 w29 w27 w25
;-----------------------------------------------------------------------------
DCT_8_INV_ROW_1 MACRO INP:REQ, OUT:REQ, TABLE:REQ, ROUNDER:REQ
movq mm0, mptr [INP] ; 0 ; x3 x2 x1 x0
movq mm1, mptr [INP+8] ; 1 ; x7 x6 x5 x4
movq mm2, mm0 ; 2 ; x3 x2 x1 x0
movq mm3, mptr [TABLE] ; 3 ; w06 w04 w02 w00
punpcklwd mm0, mm1 ; x5 x1 x4 x0
movq mm5, mm0 ; 5 ; x5 x1 x4 x0
punpckldq mm0, mm0 ; x4 x0 x4 x0
movq mm4, mptr [TABLE+8] ; 4 ; w07 w05 w03 w01
punpckhwd mm2, mm1 ; 1 ; x7 x3 x6 x2
pmaddwd mm3, mm0 ; x4*w06+x0*w04 x4*w02+x0*w00
movq mm6, mm2 ; 6 ; x7 x3 x6 x2
movq mm1, mptr [TABLE+32] ; 1 ; w22 w20 w18 w16
punpckldq mm2, mm2 ; x6 x2 x6 x2
pmaddwd mm4, mm2 ; x6*w07+x2*w05 x6*w03+x2*w01
punpckhdq mm5, mm5 ; x5 x1 x5 x1
pmaddwd mm0, mptr [TABLE+16] ; x4*w14+x0*w12 x4*w10+x0*w08
punpckhdq mm6, mm6 ; x7 x3 x7 x3
movq mm7, mptr [TABLE+40] ; 7 ; w23 w21 w19 w17
pmaddwd mm1, mm5 ; x5*w22+x1*w20 x5*w18+x1*w16
paddd mm3, mptr [ROUNDER] ; +rounder
pmaddwd mm7, mm6 ; x7*w23+x3*w21 x7*w19+x3*w17
pmaddwd mm2, mptr [TABLE+24] ; x6*w15+x2*w13 x6*w11+x2*w09
paddd mm3, mm4 ; 4 ; a1=sum(even1) a0=sum(even0)
pmaddwd mm5, mptr [TABLE+48] ; x5*w30+x1*w28 x5*w26+x1*w24
movq mm4, mm3 ; 4 ; a1 a0
pmaddwd mm6, mptr [TABLE+56] ; x7*w31+x3*w29 x7*w27+x3*w25
paddd mm1, mm7 ; 7 ; b1=sum(odd1) b0=sum(odd0)
paddd mm0, mptr [ROUNDER] ; +rounder
psubd mm3, mm1 ; a1-b1 a0-b0
psrad mm3, SHIFT_INV_ROW ; y6=a1-b1 y7=a0-b0
paddd mm1, mm4 ; 4 ; a1+b1 a0+b0
paddd mm0, mm2 ; 2 ; a3=sum(even3) a2=sum(even2)
psrad mm1, SHIFT_INV_ROW ; y1=a1+b1 y0=a0+b0
paddd mm5, mm6 ; 6 ; b3=sum(odd3) b2=sum(odd2)
movq mm4, mm0 ; 4 ; a3 a2
paddd mm0, mm5 ; a3+b3 a2+b2
psubd mm4, mm5 ; 5 ; a3-b3 a2-b2
psrad mm0, SHIFT_INV_ROW ; y3=a3+b3 y2=a2+b2
psrad mm4, SHIFT_INV_ROW ; y4=a3-b3 y5=a2-b2
packssdw mm1, mm0 ; 0 ; y3 y2 y1 y0
packssdw mm4, mm3 ; 3 ; y6 y7 y4 y5
movq mm7, mm4 ; 7 ; y6 y7 y4 y5
psrld mm4, 16 ; 0 y6 0 y4
pslld mm7, 16 ; y7 0 y5 0
movq mptr [OUT], mm1 ; 1 ; save y3 y2 y1 y0
por mm7, mm4 ; 4 ; y7 y6 y5 y4
movq mptr [OUT+8], mm7 ; 7 ; save y7 y6 y5 y4
ENDM
;=============================================================================
; code for Pentium III
;=============================================================================
; Table for rows 0,4 - constants are multiplied by cos_4_16
tab_i_04_s sword 16384, 21407, 16384, 8867 ; movq-> w05 w04 w01 w00
sword 16384, 8867, -16384, -21407 ; w07 w06 w03 w02
sword 16384, -8867, 16384, -21407 ; w13 w12 w09 w08
sword -16384, 21407, 16384, -8867 ; w15 w14 w11 w10
sword 22725, 19266, 19266, -4520 ; w21 w20 w17 w16
sword 12873, 4520, -22725, -12873 ; w23 w22 w19 w18
sword 12873, -22725, 4520, -12873 ; w29 w28 w25 w24
sword 4520, 19266, 19266, -22725 ; w31 w30 w27 w26
; Table for rows 1,7 - constants are multiplied by cos_1_16
tab_i_17_s sword 22725, 29692, 22725, 12299 ; movq-> w05 w04 w01 w00
sword 22725, 12299, -22725, -29692 ; w07 w06 w03 w02
sword 22725, -12299, 22725, -29692 ; w13 w12 w09 w08
sword -22725, 29692, 22725, -12299 ; w15 w14 w11 w10
sword 31521, 26722, 26722, -6270 ; w21 w20 w17 w16
sword 17855, 6270, -31521, -17855 ; w23 w22 w19 w18
sword 17855, -31521, 6270, -17855 ; w29 w28 w25 w24
sword 6270, 26722, 26722, -31521 ; w31 w30 w27 w26
; Table for rows 2,6 - constants are multiplied by cos_2_16
tab_i_26_s sword 21407, 27969, 21407, 11585 ; movq-> w05 w04 w01 w00
sword 21407, 11585, -21407, -27969 ; w07 w06 w03 w02
sword 21407, -11585, 21407, -27969 ; w13 w12 w09 w08
sword -21407, 27969, 21407, -11585 ; w15 w14 w11 w10
sword 29692, 25172, 25172, -5906 ; w21 w20 w17 w16
sword 16819, 5906, -29692, -16819 ; w23 w22 w19 w18
sword 16819, -29692, 5906, -16819 ; w29 w28 w25 w24
sword 5906, 25172, 25172, -29692 ; w31 w30 w27 w26
; Table for rows 3,5 - constants are multiplied by cos_3_16
tab_i_35_s sword 19266, 25172, 19266, 10426 ; movq-> w05 w04 w01 w00
sword 19266, 10426, -19266, -25172 ; w07 w06 w03 w02
sword 19266, -10426, 19266, -25172 ; w13 w12 w09 w08
sword -19266, 25172, 19266, -10426 ; w15 w14 w11 w10
sword 26722, 22654, 22654, -5315 ; w21 w20 w17 w16
sword 15137, 5315, -26722, -15137 ; w23 w22 w19 w18
sword 15137, -26722, 5315, -15137 ; w29 w28 w25 w24
sword 5315, 22654, 22654, -26722 ; w31 w30 w27 w26
;-----------------------------------------------------------------------------
DCT_8_INV_ROW_1_s MACRO INP:REQ, OUT:REQ, TABLE:REQ, ROUNDER:REQ
movq mm0, mptr [INP] ; 0 ; x3 x2 x1 x0
movq mm1, mptr [INP+8] ; 1 ; x7 x6 x5 x4
movq mm2, mm0 ; 2 ; x3 x2 x1 x0
movq mm3, mptr [TABLE] ; 3 ; w05 w04 w01 w00
pshufw mm0, mm0, 10001000b ; x2 x0 x2 x0
movq mm4, mptr [TABLE+8] ; 4 ; w07 w06 w03 w02
movq mm5, mm1 ; 5 ; x7 x6 x5 x4
pmaddwd mm3, mm0 ; x2*w05+x0*w04 x2*w01+x0*w00
movq mm6, mptr [TABLE+32] ; 6 ; w21 w20 w17 w16
pshufw mm1, mm1, 10001000b ; x6 x4 x6 x4
pmaddwd mm4, mm1 ; x6*w07+x4*w06 x6*w03+x4*w02
movq mm7, mptr [TABLE+40] ; 7 ; w23 w22 w19 w18
pshufw mm2, mm2, 11011101b ; x3 x1 x3 x1
pmaddwd mm6, mm2 ; x3*w21+x1*w20 x3*w17+x1*w16
pshufw mm5, mm5, 11011101b ; x7 x5 x7 x5
pmaddwd mm7, mm5 ; x7*w23+x5*w22 x7*w19+x5*w18
paddd mm3, mptr [ROUNDER] ; +rounder
pmaddwd mm0, mptr [TABLE+16] ; x2*w13+x0*w12 x2*w09+x0*w08
paddd mm3, mm4 ; 4 ; a1=sum(even1) a0=sum(even0)
pmaddwd mm1, mptr [TABLE+24] ; x6*w15+x4*w14 x6*w11+x4*w10
movq mm4, mm3 ; 4 ; a1 a0
pmaddwd mm2, mptr [TABLE+48] ; x3*w29+x1*w28 x3*w25+x1*w24
paddd mm6, mm7 ; 7 ; b1=sum(odd1) b0=sum(odd0)
pmaddwd mm5, mptr [TABLE+56] ; x7*w31+x5*w30 x7*w27+x5*w26
paddd mm3, mm6 ; a1+b1 a0+b0
paddd mm0, mptr [ROUNDER] ; +rounder
psrad mm3, SHIFT_INV_ROW ; y1=a1+b1 y0=a0+b0
paddd mm0, mm1 ; 1 ; a3=sum(even3) a2=sum(even2)
psubd mm4, mm6 ; 6 ; a1-b1 a0-b0
movq mm7, mm0 ; 7 ; a3 a2
paddd mm2, mm5 ; 5 ; b3=sum(odd3) b2=sum(odd2)
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