📄 x86_asmidct_mmx.asm
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;/****************************************************************************
; *
; * XVID MPEG-4 VIDEO CODEC
; * - MMX and XMM forward discrete cosine transform -
; *
; * Copyright(C) 2001 Peter Ross <pross@xvid.org>
; *
; * This program is free software; you can redistribute it and/or modify it
; * under the terms of the GNU General Public License as published by
; * the Free Software Foundation; either version 2 of the License, or
; * (at your option) any later version.
; *
; * This program is distributed in the hope that it will be useful,
; * but WITHOUT ANY WARRANTY; without even the implied warranty of
; * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; * GNU General Public License for more details.
; *
; * You should have received a copy of the GNU General Public License
; * along with this program; if not, write to the Free Software
; * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
; *
; * $Id: idct_mmx.asm,v 1.1 2005/07/21 09:08:25 klschoef Exp $
; *
; ***************************************************************************/
; ****************************************************************************
;
; 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)
;
BITS 32
;=============================================================================
; Macros and other preprocessor constants
;=============================================================================
%macro cglobal 1
%ifdef PREFIX
global _%1
%define %1 _%1
%else
global %1
%endif
%endmacro
%define BITS_INV_ACC 5 ; 4 or 5 for IEEE
%define SHIFT_INV_ROW 16 - BITS_INV_ACC
%define SHIFT_INV_COL 1 + BITS_INV_ACC
%define RND_INV_ROW 1024 * (6 - BITS_INV_ACC) ; 1 << (SHIFT_INV_ROW-1)
%define RND_INV_COL 16 * (BITS_INV_ACC - 3) ; 1 << (SHIFT_INV_COL-1)
%define RND_INV_CORR RND_INV_COL - 1 ; correction -1.0 and round
%define BITS_FRW_ACC 3 ; 2 or 3 for accuracy
%define SHIFT_FRW_COL BITS_FRW_ACC
%define SHIFT_FRW_ROW BITS_FRW_ACC + 17
%define RND_FRW_ROW 262144*(BITS_FRW_ACC - 1) ; 1 << (SHIFT_FRW_ROW-1)
;=============================================================================
; Local Data (Read Only)
;=============================================================================
%ifdef FORMAT_COFF
SECTION .rodata data
%else
SECTION .rodata data align=16
%endif
;-----------------------------------------------------------------------------
; Various memory constants (trigonometric values or rounding values)
;-----------------------------------------------------------------------------
ALIGN 16
one_corr:
dw 1, 1, 1, 1
round_inv_row:
dd RND_INV_ROW, RND_INV_ROW
round_inv_col:
dw RND_INV_COL, RND_INV_COL, RND_INV_COL, RND_INV_COL
round_inv_corr:
dw RND_INV_CORR, RND_INV_CORR, RND_INV_CORR, RND_INV_CORR
round_frw_row:
dd RND_FRW_ROW, RND_FRW_ROW
tg_1_16:
dw 13036, 13036, 13036, 13036 ; tg * (2<<16) + 0.5
tg_2_16:
dw 27146, 27146, 27146, 27146 ; tg * (2<<16) + 0.5
tg_3_16:
dw -21746, -21746, -21746, -21746 ; tg * (2<<16) + 0.5
cos_4_16:
dw -19195, -19195, -19195, -19195 ; cos * (2<<16) + 0.5
ocos_4_16:
dw 23170, 23170, 23170, 23170 ; cos * (2<<15) + 0.5
otg_3_16:
dw 21895, 21895, 21895, 21895 ; tg * (2<<16) + 0.5
%if SHIFT_INV_ROW == 12 ; assume SHIFT_INV_ROW == 12
rounder_0:
dd 65536, 65536
rounder_4:
dd 0, 0
rounder_1:
dd 7195, 7195
rounder_7
dd 1024, 1024
rounder_2:
dd 4520, 4520
rounder_6:
dd 1024, 1024
rounder_3:
dd 2407, 2407
rounder_5:
dd 240, 240
%elif SHIFT_INV_ROW == 11 ; assume SHIFT_INV_ROW == 11
rounder_0:
dd 65536, 65536
rounder_4:
dd 0, 0
rounder_1:
dd 3597, 3597
rounder_7:
dd 512, 512
rounder_2:
dd 2260, 2260
rounder_6:
dd 512, 512
rounder_3:
dd 1203, 1203
rounder_5:
dd 120, 120
%else
%error invalid SHIFT_INV_ROW
%endif
;-----------------------------------------------------------------------------
;
; 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)
;
;-----------------------------------------------------------------------------
;-----------------------------------------------------------------------------
; Tables for mmx processors
;-----------------------------------------------------------------------------
; Table for rows 0,4 - constants are multiplied by cos_4_16
tab_i_04_mmx:
dw 16384, 16384, 16384, -16384 ; movq-> w06 w04 w02 w00
dw 21407, 8867, 8867, -21407 ; w07 w05 w03 w01
dw 16384, -16384, 16384, 16384 ; w14 w12 w10 w08
dw -8867, 21407, -21407, -8867 ; w15 w13 w11 w09
dw 22725, 12873, 19266, -22725 ; w22 w20 w18 w16
dw 19266, 4520, -4520, -12873 ; w23 w21 w19 w17
dw 12873, 4520, 4520, 19266 ; w30 w28 w26 w24
dw -22725, 19266, -12873, -22725 ; w31 w29 w27 w25
; Table for rows 1,7 - constants are multiplied by cos_1_16
tab_i_17_mmx:
dw 22725, 22725, 22725, -22725 ; movq-> w06 w04 w02 w00
dw 29692, 12299, 12299, -29692 ; w07 w05 w03 w01
dw 22725, -22725, 22725, 22725 ; w14 w12 w10 w08
dw -12299, 29692, -29692, -12299 ; w15 w13 w11 w09
dw 31521, 17855, 26722, -31521 ; w22 w20 w18 w16
dw 26722, 6270, -6270, -17855 ; w23 w21 w19 w17
dw 17855, 6270, 6270, 26722 ; w30 w28 w26 w24
dw -31521, 26722, -17855, -31521 ; w31 w29 w27 w25
; Table for rows 2,6 - constants are multiplied by cos_2_16
tab_i_26_mmx:
dw 21407, 21407, 21407, -21407 ; movq-> w06 w04 w02 w00
dw 27969, 11585, 11585, -27969 ; w07 w05 w03 w01
dw 21407, -21407, 21407, 21407 ; w14 w12 w10 w08
dw -11585, 27969, -27969, -11585 ; w15 w13 w11 w09
dw 29692, 16819, 25172, -29692 ; w22 w20 w18 w16
dw 25172, 5906, -5906, -16819 ; w23 w21 w19 w17
dw 16819, 5906, 5906, 25172 ; w30 w28 w26 w24
dw -29692, 25172, -16819, -29692 ; w31 w29 w27 w25
; Table for rows 3,5 - constants are multiplied by cos_3_16
tab_i_35_mmx:
dw 19266, 19266, 19266, -19266 ; movq-> w06 w04 w02 w00
dw 25172, 10426, 10426, -25172 ; w07 w05 w03 w01
dw 19266, -19266, 19266, 19266 ; w14 w12 w10 w08
dw -10426, 25172, -25172, -10426 ; w15 w13 w11 w09
dw 26722, 15137, 22654, -26722 ; w22 w20 w18 w16
dw 22654, 5315, -5315, -15137 ; w23 w21 w19 w17
dw 15137, 5315, 5315, 22654 ; w30 w28 w26 w24
dw -26722, 22654, -15137, -26722 ; w31 w29 w27 w25
;-----------------------------------------------------------------------------
; Tables for xmm processors
;-----------------------------------------------------------------------------
; %3 for rows 0,4 - constants are multiplied by cos_4_16
tab_i_04_xmm:
dw 16384, 21407, 16384, 8867 ; movq-> w05 w04 w01 w00
dw 16384, 8867, -16384, -21407 ; w07 w06 w03 w02
dw 16384, -8867, 16384, -21407 ; w13 w12 w09 w08
dw -16384, 21407, 16384, -8867 ; w15 w14 w11 w10
dw 22725, 19266, 19266, -4520 ; w21 w20 w17 w16
dw 12873, 4520, -22725, -12873 ; w23 w22 w19 w18
dw 12873, -22725, 4520, -12873 ; w29 w28 w25 w24
dw 4520, 19266, 19266, -22725 ; w31 w30 w27 w26
; %3 for rows 1,7 - constants are multiplied by cos_1_16
tab_i_17_xmm:
dw 22725, 29692, 22725, 12299 ; movq-> w05 w04 w01 w00
dw 22725, 12299, -22725, -29692 ; w07 w06 w03 w02
dw 22725, -12299, 22725, -29692 ; w13 w12 w09 w08
dw -22725, 29692, 22725, -12299 ; w15 w14 w11 w10
dw 31521, 26722, 26722, -6270 ; w21 w20 w17 w16
dw 17855, 6270, -31521, -17855 ; w23 w22 w19 w18
dw 17855, -31521, 6270, -17855 ; w29 w28 w25 w24
dw 6270, 26722, 26722, -31521 ; w31 w30 w27 w26
; %3 for rows 2,6 - constants are multiplied by cos_2_16
tab_i_26_xmm:
dw 21407, 27969, 21407, 11585 ; movq-> w05 w04 w01 w00
dw 21407, 11585, -21407, -27969 ; w07 w06 w03 w02
dw 21407, -11585, 21407, -27969 ; w13 w12 w09 w08
dw -21407, 27969, 21407, -11585 ; w15 w14 w11 w10
dw 29692, 25172, 25172, -5906 ; w21 w20 w17 w16
dw 16819, 5906, -29692, -16819 ; w23 w22 w19 w18
dw 16819, -29692, 5906, -16819 ; w29 w28 w25 w24
dw 5906, 25172, 25172, -29692 ; w31 w30 w27 w26
; %3 for rows 3,5 - constants are multiplied by cos_3_16
tab_i_35_xmm:
dw 19266, 25172, 19266, 10426 ; movq-> w05 w04 w01 w00
dw 19266, 10426, -19266, -25172 ; w07 w06 w03 w02
dw 19266, -10426, 19266, -25172 ; w13 w12 w09 w08
dw -19266, 25172, 19266, -10426 ; w15 w14 w11 w10
dw 26722, 22654, 22654, -5315 ; w21 w20 w17 w16
dw 15137, 5315, -26722, -15137 ; w23 w22 w19 w18
dw 15137, -26722, 5315, -15137 ; w29 w28 w25 w24
dw 5315, 22654, 22654, -26722 ; w31 w30 w27 w26
;=============================================================================
; Helper macros for the code
;=============================================================================
;-----------------------------------------------------------------------------
; DCT_8_INV_ROW_MMX INP, OUT, TABLE, ROUNDER
;-----------------------------------------------------------------------------
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