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FFmpeg/libavcodec/i386/fdct_mmx.s

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; //////////////////////////////////////////////////////////////////////////////
; //
; // fdctam32.c - AP922 MMX(3D-Now) forward-DCT
; // ----------
; // Intel Application Note AP-922 - fast, precise implementation of DCT
; // http://developer.intel.com/vtune/cbts/appnotes.htm
; // ----------
; //
; // This routine can use a 3D-Now/MMX enhancement to increase the
; // accuracy of the fdct_col_4 macro. The dct_col function uses 3D-Now's
; // PMHULHRW instead of MMX's PMHULHW(and POR). The substitution improves
; // accuracy very slightly with performance penalty. If the target CPU
; // does not support 3D-Now, then this function cannot be executed.
; //
; // For a fast, precise MMX implementation of inverse-DCT
; // visit http://www.elecard.com/peter
; //
; // v1.0 07/22/2000 (initial release)
; //
; // liaor@iname.com http://members.tripod.com/~liaor
; //////////////////////////////////////////////////////////////////////////////
;;;
;;; A.Stevens Jul 2000: ported to nasm syntax and disentangled from
;;; from Win**** compiler specific stuff.
;;; All the real work was done above though.
;;; See above for how to optimise quality on 3DNow! CPU's
;;
;; Macros for code-readability...
;;
%define INP eax ; pointer to (short *blk)
%define OUT ecx ; pointer to output (temporary store space qwTemp[])
%define TABLE ebx ; pointer to tab_frw_01234567[]
%define TABLEF ebx ; pointer to tg_all_16
%define round_frw_row edx
%define x0 INP + 0*16
%define x1 INP + 1*16
%define x2 INP + 2*16
%define x3 INP + 3*16
%define x4 INP + 4*16
%define x5 INP + 5*16
%define x6 INP + 6*16
%define x7 INP + 7*16
%define y0 OUT + 0*16
%define y1 OUT + 1*16
%define y2 OUT + 2*16
%define y3 OUT + 3*16
%define y4 OUT + 4*16
%define y5 OUT + 5*16
%define y6 OUT + 6*16
%define y7 OUT + 7*16
;;
;; Constants for DCT
;;
%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 (1 << (SHIFT_FRW_ROW-1))
%define RND_FRW_COL (1 << (SHIFT_FRW_COL-1))
extern fdct_one_corr
extern fdct_r_row ; Defined in C for convenience
;;
;; Concatenated table of forward dct transformation coeffs.
;;
extern fdct_tg_all_16 ; Defined in C for convenience
;; Offsets into table..
%define tg_1_16 (TABLEF + 0)
%define tg_2_16 (TABLEF + 8)
%define tg_3_16 (TABLEF + 16)
%define cos_4_16 (TABLEF + 24)
%define ocos_4_16 (TABLEF + 32)
;;
;; Concatenated table of forward dct coefficients
;;
extern tab_frw_01234567 ; Defined in C for convenience
;; Offsets into table..
SECTION .text
global fdct_mmx
;;;
;;; void fdct_mmx( short *blk )
;;;
; ////////////////////////////////////////////////////////////////////////
; //
; // The high-level pseudocode for the fdct_am32() routine :
; //
; // fdct_am32()
; // {
; // forward_dct_col03(); // dct_column transform on cols 0-3
; // forward_dct_col47(); // dct_column transform on cols 4-7
; // for ( j = 0; j < 8; j=j+1 )
; // forward_dct_row1(j); // dct_row transform on row #j
; // }
; //
;
align 32
fdct_mmx:
push ebp ; save stack pointer
mov ebp, esp ; link
push ebx
push ecx
push edx
push edi
mov INP, [ebp+8]; ; input data is row 0 of blk[]
;// transform the left half of the matrix (4 columns)
lea TABLEF, [fdct_tg_all_16];
mov OUT, INP;
; lea round_frw_col, [r_frw_col]
; for ( i = 0; i < 2; i = i + 1)
; the for-loop is executed twice. We are better off unrolling the
; loop to avoid branch misprediction.
.mmx32_fdct_col03:
movq mm0, [x1] ; 0 ; x1
;;
movq mm1, [x6] ; 1 ; x6
movq mm2, mm0 ; 2 ; x1
movq mm3, [x2] ; 3 ; x2
paddsw mm0, mm1 ; t1 = x[1] + x[6]
movq mm4, [x5] ; 4 ; x5
psllw mm0, SHIFT_FRW_COL ; t1
movq mm5, [x0] ; 5 ; x0
paddsw mm4, mm3 ; t2 = x[2] + x[5]
paddsw mm5, [x7] ; t0 = x[0] + x[7]
psllw mm4, SHIFT_FRW_COL ; t2
movq mm6, mm0 ; 6 ; t1
psubsw mm2, mm1 ; 1 ; t6 = x[1] - x[6]
movq mm1, [tg_2_16] ; 1 ; tg_2_16
psubsw mm0, mm4 ; tm12 = t1 - t2
movq mm7, [x3] ; 7 ; x3
pmulhw mm1, mm0 ; tm12*tg_2_16
paddsw mm7, [x4] ; t3 = x[3] + x[4]
psllw mm5, SHIFT_FRW_COL ; t0
paddsw mm6, mm4 ; 4 ; tp12 = t1 + t2
psllw mm7, SHIFT_FRW_COL ; t3
movq mm4, mm5 ; 4 ; t0
psubsw mm5, mm7 ; tm03 = t0 - t3
paddsw mm1, mm5 ; y2 = tm03 + tm12*tg_2_16
paddsw mm4, mm7 ; 7 ; tp03 = t0 + t3
por mm1, [fdct_one_corr] ; correction y2 +0.5
psllw mm2, SHIFT_FRW_COL+1 ; t6
pmulhw mm5, [tg_2_16] ; tm03*tg_2_16
movq mm7, mm4 ; 7 ; tp03
psubsw mm3, [x5] ; t5 = x[2] - x[5]
psubsw mm4, mm6 ; y4 = tp03 - tp12
movq [y2], mm1 ; 1 ; save y2
paddsw mm7, mm6 ; 6 ; y0 = tp03 + tp12
movq mm1, [x3] ; 1 ; x3
psllw mm3, SHIFT_FRW_COL+1 ; t5
psubsw mm1, [x4] ; t4 = x[3] - x[4]
movq mm6, mm2 ; 6 ; t6
movq [y4], mm4 ; 4 ; save y4
paddsw mm2, mm3 ; t6 + t5
pmulhw mm2, [ocos_4_16] ; tp65 = (t6 + t5)*cos_4_16
psubsw mm6, mm3 ; 3 ; t6 - t5
pmulhw mm6, [ocos_4_16] ; tm65 = (t6 - t5)*cos_4_16
psubsw mm5, mm0 ; 0 ; y6 = tm03*tg_2_16 - tm12
por mm5, [fdct_one_corr] ; correction y6 +0.5
psllw mm1, SHIFT_FRW_COL ; t4
por mm2, [fdct_one_corr] ; correction tp65 +0.5
movq mm4, mm1 ; 4 ; t4
movq mm3, [x0] ; 3 ; x0
paddsw mm1, mm6 ; tp465 = t4 + tm65
psubsw mm3, [x7] ; t7 = x[0] - x[7]
psubsw mm4, mm6 ; 6 ; tm465 = t4 - tm65
movq mm0, [tg_1_16] ; 0 ; tg_1_16
psllw mm3, SHIFT_FRW_COL ; t7
movq mm6, [tg_3_16] ; 6 ; tg_3_16
pmulhw mm0, mm1 ; tp465*tg_1_16
movq [y0], mm7 ; 7 ; save y0
pmulhw mm6, mm4 ; tm465*tg_3_16
movq [y6], mm5 ; 5 ; save y6
movq mm7, mm3 ; 7 ; t7
movq mm5, [tg_3_16] ; 5 ; tg_3_16
psubsw mm7, mm2 ; tm765 = t7 - tp65
paddsw mm3, mm2 ; 2 ; tp765 = t7 + tp65
pmulhw mm5, mm7 ; tm765*tg_3_16
paddsw mm0, mm3 ; y1 = tp765 + tp465*tg_1_16
paddsw mm6, mm4 ; tm465*tg_3_16
pmulhw mm3, [tg_1_16] ; tp765*tg_1_16
;;
por mm0, [fdct_one_corr] ; correction y1 +0.5
paddsw mm5, mm7 ; tm765*tg_3_16
psubsw mm7, mm6 ; 6 ; y3 = tm765 - tm465*tg_3_16
add INP, 0x08 ; ; increment pointer
movq [y1], mm0 ; 0 ; save y1
paddsw mm5, mm4 ; 4 ; y5 = tm765*tg_3_16 + tm465
movq [y3], mm7 ; 7 ; save y3
psubsw mm3, mm1 ; 1 ; y7 = tp765*tg_1_16 - tp465
movq [y5], mm5 ; 5 ; save y5
.mmx32_fdct_col47: ; begin processing last four columns
movq mm0, [x1] ; 0 ; x1
;;
movq [y7], mm3 ; 3 ; save y7 (columns 0-4)
;;
movq mm1, [x6] ; 1 ; x6
movq mm2, mm0 ; 2 ; x1
movq mm3, [x2] ; 3 ; x2
paddsw mm0, mm1 ; t1 = x[1] + x[6]
movq mm4, [x5] ; 4 ; x5
psllw mm0, SHIFT_FRW_COL ; t1
movq mm5, [x0] ; 5 ; x0
paddsw mm4, mm3 ; t2 = x[2] + x[5]
paddsw mm5, [x7] ; t0 = x[0] + x[7]
psllw mm4, SHIFT_FRW_COL ; t2
movq mm6, mm0 ; 6 ; t1
psubsw mm2, mm1 ; 1 ; t6 = x[1] - x[6]
movq mm1, [tg_2_16] ; 1 ; tg_2_16
psubsw mm0, mm4 ; tm12 = t1 - t2
movq mm7, [x3] ; 7 ; x3
pmulhw mm1, mm0 ; tm12*tg_2_16
paddsw mm7, [x4] ; t3 = x[3] + x[4]
psllw mm5, SHIFT_FRW_COL ; t0
paddsw mm6, mm4 ; 4 ; tp12 = t1 + t2
psllw mm7, SHIFT_FRW_COL ; t3
movq mm4, mm5 ; 4 ; t0
psubsw mm5, mm7 ; tm03 = t0 - t3
paddsw mm1, mm5 ; y2 = tm03 + tm12*tg_2_16
paddsw mm4, mm7 ; 7 ; tp03 = t0 + t3
por mm1, [fdct_one_corr] ; correction y2 +0.5
psllw mm2, SHIFT_FRW_COL+1 ; t6
pmulhw mm5, [tg_2_16] ; tm03*tg_2_16
movq mm7, mm4 ; 7 ; tp03
psubsw mm3, [x5] ; t5 = x[2] - x[5]
psubsw mm4, mm6 ; y4 = tp03 - tp12
movq [y2+8], mm1 ; 1 ; save y2
paddsw mm7, mm6 ; 6 ; y0 = tp03 + tp12
movq mm1, [x3] ; 1 ; x3
psllw mm3, SHIFT_FRW_COL+1 ; t5
psubsw mm1, [x4] ; t4 = x[3] - x[4]
movq mm6, mm2 ; 6 ; t6
movq [y4+8], mm4 ; 4 ; save y4
paddsw mm2, mm3 ; t6 + t5
pmulhw mm2, [ocos_4_16] ; tp65 = (t6 + t5)*cos_4_16
psubsw mm6, mm3 ; 3 ; t6 - t5
pmulhw mm6, [ocos_4_16] ; tm65 = (t6 - t5)*cos_4_16
psubsw mm5, mm0 ; 0 ; y6 = tm03*tg_2_16 - tm12
por mm5, [fdct_one_corr] ; correction y6 +0.5
psllw mm1, SHIFT_FRW_COL ; t4
por mm2, [fdct_one_corr] ; correction tp65 +0.5
movq mm4, mm1 ; 4 ; t4
movq mm3, [x0] ; 3 ; x0
paddsw mm1, mm6 ; tp465 = t4 + tm65
psubsw mm3, [x7] ; t7 = x[0] - x[7]
psubsw mm4, mm6 ; 6 ; tm465 = t4 - tm65
movq mm0, [tg_1_16] ; 0 ; tg_1_16
psllw mm3, SHIFT_FRW_COL ; t7
movq mm6, [tg_3_16] ; 6 ; tg_3_16
pmulhw mm0, mm1 ; tp465*tg_1_16
movq [y0+8], mm7 ; 7 ; save y0
pmulhw mm6, mm4 ; tm465*tg_3_16
movq [y6+8], mm5 ; 5 ; save y6
movq mm7, mm3 ; 7 ; t7
movq mm5, [tg_3_16] ; 5 ; tg_3_16
psubsw mm7, mm2 ; tm765 = t7 - tp65
paddsw mm3, mm2 ; 2 ; tp765 = t7 + tp65
pmulhw mm5, mm7 ; tm765*tg_3_16
paddsw mm0, mm3 ; y1 = tp765 + tp465*tg_1_16
paddsw mm6, mm4 ; tm465*tg_3_16
pmulhw mm3, [tg_1_16] ; tp765*tg_1_16
;;
por mm0, [fdct_one_corr] ; correction y1 +0.5
paddsw mm5, mm7 ; tm765*tg_3_16
psubsw mm7, mm6 ; 6 ; y3 = tm765 - tm465*tg_3_16
;;
movq [y1+8], mm0 ; 0 ; save y1
paddsw mm5, mm4 ; 4 ; y5 = tm765*tg_3_16 + tm465
movq [y3+8], mm7 ; 7 ; save y3
psubsw mm3, mm1 ; 1 ; y7 = tp765*tg_1_16 - tp465
movq [y5+8], mm5 ; 5 ; save y5
movq [y7+8], mm3 ; 3 ; save y7
; emms;
; } ; end of forward_dct_col07()
; done with dct_row transform
; fdct_mmx32_cols() --
; the following subroutine repeats the row-transform operation,
; except with different shift&round constants. This version
; does NOT transpose the output again. Thus the final output
; is transposed with respect to the source.
;
; The output is stored into blk[], which destroys the original
; input data.
mov INP, [ebp+8]; ;; row 0
mov edi, 0x08; ;x = 8
lea TABLE, [tab_frw_01234567]; ; row 0
mov OUT, INP;
lea round_frw_row, [fdct_r_row];
; for ( x = 8; x > 0; --x ) ; transform one row per iteration
; ---------- loop begin
.lp_mmx_fdct_row1:
movd mm5, [INP+12]; ; mm5 = 7 6
punpcklwd mm5, [INP+8] ; mm5 = 5 7 4 6
movq mm2, mm5; ; mm2 = 5 7 4 6
psrlq mm5, 32; ; mm5 = _ _ 5 7
movq mm0, [INP]; ; mm0 = 3 2 1 0
punpcklwd mm5, mm2;; mm5 = 4 5 6 7
movq mm1, mm0; ; mm1 = 3 2 1 0
paddsw mm0, mm5; ; mm0 = [3+4, 2+5, 1+6, 0+7] (xt3, xt2, xt1, xt0)
psubsw mm1, mm5; ; mm1 = [3-4, 2-5, 1-6, 0-7] (xt7, xt6, xt5, xt4)
movq mm2, mm0; ; mm2 = [ xt3 xt2 xt1 xt0 ]
;movq [ xt3xt2xt1xt0 ], mm0;
;movq [ xt7xt6xt5xt4 ], mm1;
punpcklwd mm0, mm1;; mm0 = [ xt5 xt1 xt4 xt0 ]
punpckhwd mm2, mm1;; mm2 = [ xt7 xt3 xt6 xt2 ]
movq mm1, mm2; ; mm1
;; shuffle bytes around
; movq mm0, [INP] ; 0 ; x3 x2 x1 x0
; movq mm1, [INP+8] ; 1 ; x7 x6 x5 x4
movq mm2, mm0 ; 2 ; x3 x2 x1 x0
movq mm3, [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 [ xt2 xt0 xt2 xt0 ]
movq mm4, [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, [TABLE+32] ; 1 ; w22 w20 w18 w16
punpckldq mm2, mm2 ; x6 x2 x6 x2 [ xt3 xt1 xt3 xt1 ]
pmaddwd mm4, mm2 ; x6*w07+x2*w05 x6*w03+x2*w01
punpckhdq mm5, mm5 ; x5 x1 x5 x1 [ xt6 xt4 xt6 xt4 ]
pmaddwd mm0, [TABLE+16] ; x4*w14+x0*w12 x4*w10+x0*w08
punpckhdq mm6, mm6 ; x7 x3 x7 x3 [ xt7 xt5 xt7 xt5 ]
movq mm7, [TABLE+40] ; 7 ; w23 w21 w19 w17
pmaddwd mm1, mm5 ; x5*w22+x1*w20 x5*w18+x1*w16
;mm3 = a1, a0 (y2,y0)
;mm1 = b1, b0 (y3,y1)
;mm0 = a3,a2 (y6,y4)
;mm5 = b3,b2 (y7,y5)
paddd mm3, [round_frw_row] ; +rounder (y2,y0)
pmaddwd mm7, mm6 ; x7*w23+x3*w21 x7*w19+x3*w17
pmaddwd mm2, [TABLE+24] ; x6*w15+x2*w13 x6*w11+x2*w09
paddd mm3, mm4 ; 4 ; a1=sum(even1) a0=sum(even0) ; now ( y2, y0)
pmaddwd mm5, [TABLE+48] ; x5*w30+x1*w28 x5*w26+x1*w24
;;
pmaddwd mm6, [TABLE+56] ; x7*w31+x3*w29 x7*w27+x3*w25
paddd mm1, mm7 ; 7 ; b1=sum(odd1) b0=sum(odd0) ; now ( y3, y1)
paddd mm0, [round_frw_row] ; +rounder (y6,y4)
psrad mm3, SHIFT_FRW_ROW ; (y2, y0)
paddd mm1, [round_frw_row] ; +rounder (y3,y1)
paddd mm0, mm2 ; 2 ; a3=sum(even3) a2=sum(even2) ; now (y6, y4)
paddd mm5, [round_frw_row] ; +rounder (y7,y5)
psrad mm1, SHIFT_FRW_ROW ; y1=a1+b1 y0=a0+b0
paddd mm5, mm6 ; 6 ; b3=sum(odd3) b2=sum(odd2) ; now ( y7, y5)
psrad mm0, SHIFT_FRW_ROW ;y3=a3+b3 y2=a2+b2
add OUT, 16; ; increment row-output address by 1 row
psrad mm5, SHIFT_FRW_ROW ; y4=a3-b3 y5=a2-b2
add INP, 16; ; increment row-address by 1 row
packssdw mm3, mm0 ; 0 ; y6 y4 y2 y0
packssdw mm1, mm5 ; 3 ; y7 y5 y3 y1
movq mm6, mm3; ; mm0 = y6 y4 y2 y0
punpcklwd mm3, mm1; ; y3 y2 y1 y0
sub edi, 0x01; ; i = i - 1
punpckhwd mm6, mm1; ; y7 y6 y5 y4
add TABLE,64; ; increment to next table
movq [OUT-16], mm3 ; 1 ; save y3 y2 y1 y0
movq [OUT-8], mm6 ; 7 ; save y7 y6 y5 y4
cmp edi, 0x00;
jg near .lp_mmx_fdct_row1; ; begin fdct processing on next row
;;
;; Tidy up and return
;;
pop edi
pop edx
pop ecx
pop ebx
pop ebp ; restore stack pointer
emms
ret