; ////////////////////////////////////////////////////////////////////////////// ; // ; // 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