;
; jfdctint.asm - accurate integer FDCT (MMX)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright (C) 2016, 2020, D. R. Commander.
;
; Based on the 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 a slower but more accurate integer implementation of the
; forward DCT (Discrete Cosine Transform). The following code is based
; directly on the IJG's original jfdctint.c; see the jfdctint.c for
; more details.
%include "jsimdext.inc"
%include "jdct.inc"
; --------------------------------------------------------------------------
%define CONST_BITS 13
%define PASS1_BITS 2
%define DESCALE_P1 (CONST_BITS - PASS1_BITS)
%define DESCALE_P2 (CONST_BITS + PASS1_BITS)
%if CONST_BITS == 13
F_0_298 equ 2446 ; FIX(0.298631336)
F_0_390 equ 3196 ; FIX(0.390180644)
F_0_541 equ 4433 ; FIX(0.541196100)
F_0_765 equ 6270 ; FIX(0.765366865)
F_0_899 equ 7373 ; FIX(0.899976223)
F_1_175 equ 9633 ; FIX(1.175875602)
F_1_501 equ 12299 ; FIX(1.501321110)
F_1_847 equ 15137 ; FIX(1.847759065)
F_1_961 equ 16069 ; FIX(1.961570560)
F_2_053 equ 16819 ; FIX(2.053119869)
F_2_562 equ 20995 ; FIX(2.562915447)
F_3_072 equ 25172 ; FIX(3.072711026)
%else
; NASM cannot do compile-time arithmetic on floating-point constants.
%define DESCALE(x, n) (((x) + (1 << ((n) - 1))) >> (n))
F_0_298 equ DESCALE( 320652955, 30 - CONST_BITS) ; FIX(0.298631336)
F_0_390 equ DESCALE( 418953276, 30 - CONST_BITS) ; FIX(0.390180644)
F_0_541 equ DESCALE( 581104887, 30 - CONST_BITS) ; FIX(0.541196100)
F_0_765 equ DESCALE( 821806413, 30 - CONST_BITS) ; FIX(0.765366865)
F_0_899 equ DESCALE( 966342111, 30 - CONST_BITS) ; FIX(0.899976223)
F_1_175 equ DESCALE(1262586813, 30 - CONST_BITS) ; FIX(1.175875602)
F_1_501 equ DESCALE(1612031267, 30 - CONST_BITS) ; FIX(1.501321110)
F_1_847 equ DESCALE(1984016188, 30 - CONST_BITS) ; FIX(1.847759065)
F_1_961 equ DESCALE(2106220350, 30 - CONST_BITS) ; FIX(1.961570560)
F_2_053 equ DESCALE(2204520673, 30 - CONST_BITS) ; FIX(2.053119869)
F_2_562 equ DESCALE(2751909506, 30 - CONST_BITS) ; FIX(2.562915447)
F_3_072 equ DESCALE(3299298341, 30 - CONST_BITS) ; FIX(3.072711026)
%endif
; --------------------------------------------------------------------------
SECTION SEG_CONST
alignz 32
GLOBAL_DATA(jconst_fdct_islow_mmx)
EXTN(jconst_fdct_islow_mmx):
PW_F130_F054 times 2 dw (F_0_541 + F_0_765), F_0_541
PW_F054_MF130 times 2 dw F_0_541, (F_0_541 - F_1_847)
PW_MF078_F117 times 2 dw (F_1_175 - F_1_961), F_1_175
PW_F117_F078 times 2 dw F_1_175, (F_1_175 - F_0_390)
PW_MF060_MF089 times 2 dw (F_0_298 - F_0_899), -F_0_899
PW_MF089_F060 times 2 dw -F_0_899, (F_1_501 - F_0_899)
PW_MF050_MF256 times 2 dw (F_2_053 - F_2_562), -F_2_562
PW_MF256_F050 times 2 dw -F_2_562, (F_3_072 - F_2_562)
PD_DESCALE_P1 times 2 dd 1 << (DESCALE_P1 - 1)
PD_DESCALE_P2 times 2 dd 1 << (DESCALE_P2 - 1)
PW_DESCALE_P2X times 4 dw 1 << (PASS1_BITS - 1)
alignz 32
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
;
; Perform the forward DCT on one block of samples.
;
; GLOBAL(void)
; jsimd_fdct_islow_mmx(DCTELEM *data)
;
%define data(b) (b) + 8 ; DCTELEM *data
%define original_ebp ebp + 0
%define wk(i) ebp - (WK_NUM - (i)) * SIZEOF_MMWORD ; mmword wk[WK_NUM]
%define WK_NUM 2
align 32
GLOBAL_FUNCTION(jsimd_fdct_islow_mmx)
EXTN(jsimd_fdct_islow_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, [wk(0)]
pushpic ebx
; push ecx ; need not be preserved
; push edx ; need not be preserved
; push esi ; unused
; push edi ; unused
get_GOT ebx ; get GOT address
; ---- Pass 1: process rows.
mov edx, POINTER [data(eax)] ; (DCTELEM *)
mov ecx, DCTSIZE/4
alignx 16, 7
.rowloop:
movq mm0, MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)]
movq mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)]
movq mm2, MMWORD [MMBLOCK(2,1,edx,SIZEOF_DCTELEM)]
movq mm3, MMWORD [MMBLOCK(3,1,edx,SIZEOF_DCTELEM)]
; mm0=(20 21 22 23), mm2=(24 25 26 27)
; mm1=(30 31 32 33), mm3=(34 35 36 37)
movq mm4, mm0 ; transpose coefficients(phase 1)
punpcklwd mm0, mm1 ; mm0=(20 30 21 31)
punpckhwd mm4, mm1 ; mm4=(22 32 23 33)
movq mm5, mm2 ; transpose coefficients(phase 1)
punpcklwd mm2, mm3 ; mm2=(24 34 25 35)
punpckhwd mm5, mm3 ; mm5=(26 36 27 37)
movq mm6, MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)]
movq mm7, MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)]
movq mm1, MMWORD [MMBLOCK(0,1,edx,SIZEOF_DCTELEM)]
movq mm3, MMWORD [MMBLOCK(1,1,edx,SIZEOF_DCTELEM)]
; mm6=(00 01 02 03), mm1=(04 05 06 07)
; mm7=(10 11 12 13), mm3=(14 15 16 17)
movq MMWORD [wk(0)], mm4 ; wk(0)=(22 32 23 33)
movq MMWORD [wk(1)], mm2 ; wk(1)=(24 34 25 35)
movq mm4, mm6 ; transpose coefficients(phase 1)
punpcklwd mm6, mm7 ; mm6=(00 10 01 11)
punpckhwd mm4, mm7 ; mm4=(02 12 03 13)
movq mm2, mm1 ; transpose coefficients(phase 1)
punpcklwd mm1, mm3 ; mm1=(04 14 05 15)
punpckhwd mm2, mm3 ; mm2=(06 16 07 17)
movq mm7, mm6 ; transpose coefficients(phase 2)
punpckldq mm6, mm0 ; mm6=(00 10 20 30)=data0
punpckhdq mm7, mm0 ; mm7=(01 11 21 31)=data1
movq mm3, mm2 ; transpose coefficients(phase 2)
punpckldq mm2, mm5 ; mm2=(06 16 26 36)=data6
punpckhdq mm3, mm5 ; mm3=(07 17 27 37)=data7
movq mm0, mm7
movq mm5, mm6
psubw mm7, mm2 ; mm7=data1-data6=tmp6
psubw mm6, mm3 ; mm6=data0-data7=tmp7
paddw mm0, mm2 ; mm0=data1+data6=tmp1
paddw mm5, mm3 ; mm5=data0+data7=tmp0
movq mm2, MMWORD [wk(0)] ; mm2=(22 32 23 33)
movq mm3, MMWORD [wk(1)] ; mm3=(24 34 25 35)
movq MMWORD [wk(0)], mm7 ; wk(0)=tmp6
movq MMWORD [wk(1)], mm6 ; wk(1)=tmp7
movq mm7, mm4 ; transpose coefficients(phase 2)
punpckldq mm4, mm2 ; mm4=(02 12 22 32)=data2
punpckhdq mm7, mm2 ; mm7=(03 13 23 33)=data3
movq mm6, mm1 ; transpose coefficients(phase 2)
punpckldq mm1, mm3 ; mm1=(04 14 24 34)=data4
punpckhdq mm6, mm3 ; mm6=(05 15 25 35)=data5
movq mm2, mm7
movq mm3, mm4
paddw mm7, mm1 ; mm7=data3+data4=tmp3
paddw mm4, mm6 ; mm4=data2+data5=tmp2
psubw mm2, mm1 ; mm2=data3-data4=tmp4
psubw mm3, mm6 ; mm3=data2-data5=tmp5
; -- Even part
movq mm1, mm5
movq mm6, mm0
paddw mm5, mm7 ; mm5=tmp10
paddw mm0, mm4 ; mm0=tmp11
psubw mm1, mm7 ; mm1=tmp13
psubw mm6, mm4 ; mm6=tmp12
movq mm7, mm5
paddw mm5, mm0 ; mm5=tmp10+tmp11
psubw mm7, mm0 ; mm7=tmp10-tmp11
psllw mm5, PASS1_BITS ; mm5=data0
psllw mm7, PASS1_BITS ; mm7=data4
movq MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)], mm5
movq MMWORD [MMBLOCK(0,1,edx,SIZEOF_DCTELEM)], mm7
; (Original)
; z1 = (tmp12 + tmp13) * 0.541196100;
; data2 = z1 + tmp13 * 0.765366865;
; data6 = z1 + tmp12 * -1.847759065;
;
; (This implementation)
; data2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100;
; data6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065);
movq mm4, mm1 ; mm1=tmp13
movq mm0, mm1
punpcklwd mm4, mm6 ; mm6=tmp12
punpckhwd mm0, mm6
movq mm1, mm4
movq mm6, mm0
pmaddwd mm4, [GOTOFF(ebx,PW_F130_F054)] ; mm4=data2L
pmaddwd mm0, [GOTOFF(ebx,PW_F130_F054)] ; mm0=data2H
pmaddwd mm1, [GOTOFF(ebx,PW_F054_MF130)] ; mm1=data6L
pmaddwd mm6, [GOTOFF(ebx,PW_F054_MF130)] ; mm6=data6H
paddd mm4, [GOTOFF(ebx,PD_DESCALE_P1)]
paddd mm0, [GOTOFF(ebx,PD_DESCALE_P1)]
psrad mm4, DESCALE_P1
psrad mm0, DESCALE_P1
paddd mm1, [GOTOFF(ebx,PD_DESCALE_P1)]
paddd mm6, [GOTOFF(ebx,PD_DESCALE_P1)]
psrad mm1, DESCALE_P1
psrad mm6, DESCALE_P1
packssdw mm4, mm0 ; mm4=data2
packssdw mm1, mm6 ; mm1=data6
movq MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)], mm4
movq MMWORD [MMBLOCK(2,1,edx,SIZEOF_DCTELEM)], mm1
; -- Odd part
movq mm5, MMWORD [wk(0)] ; mm5=tmp6
movq mm7, MMWORD [wk(1)] ; mm7=tmp7
movq mm0, mm2 ; mm2=tmp4
movq mm6, mm3 ; mm3=tmp5
paddw mm0, mm5 ; mm0=z3
paddw mm6, mm7 ; mm6=z4
; (Original)
; z5 = (z3 + z4) * 1.175875602;
; z3 = z3 * -1.961570560; z4 = z4 * -0.390180644;
; z3 += z5; z4 += z5;
;
; (This implementation)
; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);
movq mm4, mm0
movq mm1, mm0
punpcklwd mm4, mm6
punpckhwd mm1, mm6
movq mm0, mm4
movq mm6, mm1
pmaddwd mm4, [GOTOFF(ebx,PW_MF078_F117)] ; mm4=z3L
pmaddwd mm1, [GOTOFF(ebx,PW_MF078_F117)] ; mm1=z3H
pmaddwd mm0, [GOTOFF(ebx,PW_F117_F078)] ; mm0=z4L
pmaddwd mm6, [GOTOFF(ebx,PW_F117_F078)] ; mm6=z4H
movq MMWORD [wk(0)], mm4 ; wk(0)=z3L
movq MMWORD [wk(1)], mm1 ; wk(1)=z3H
; (Original)
; z1 = tmp4 + tmp7; z2 = tmp5 + tmp6;
; tmp4 = tmp4 * 0.298631336; tmp5 = tmp5 * 2.053119869;
; tmp6 = tmp6 * 3.072711026; tmp7 = tmp7 * 1.501321110;
; z1 = z1 * -0.899976223; z2 = z2 * -2.562915447;
; data7 = tmp4 + z1 + z3; data5 = tmp5 + z2 + z4;
; data3 = tmp6 + z2 + z3; data1 = tmp7 + z1 + z4;
;
; (This implementation)
; tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223;
; tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447;
; tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447);
; tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223);
; data7 = tmp4 + z3; data5 = tmp5 + z4;
; data3 = tmp6 + z3; data1 = tmp7 + z4;
movq mm4, mm2
movq mm1, mm2
punpcklwd mm4, mm7
punpckhwd mm1, mm7
movq mm2, mm4
movq mm7, mm1
pmaddwd mm4, [GOTOFF(ebx,PW_MF060_MF089)] ; mm4=tmp4L
pmaddwd mm1, [GOTOFF(ebx,PW_MF060_MF089)] ; mm1=tmp4H
pmaddwd mm2, [GOTOFF(ebx,PW_MF089_F060)] ; mm2=tmp7L
pmaddwd mm7, [GOTOFF(ebx,PW_MF089_F060)] ; mm7=tmp7H
paddd mm4, MMWORD [wk(0)] ; mm4=data7L
paddd mm1, MMWORD [wk(1)] ; mm1=data7H
paddd mm2, mm0 ; mm2=data1L
paddd mm7, mm6 ; mm7=data1H
paddd mm4, [GOTOFF(ebx,PD_DESCALE_P1)]
paddd mm1, [GOTOFF(ebx,PD_DESCALE_P1)]
psrad mm4, DESCALE_P1
psrad mm1, DESCALE_P1
paddd mm2, [GOTOFF(ebx,PD_DESCALE_P1)]
paddd mm7, [GOTOFF(ebx,PD_DESCALE_P1)]
psrad mm2, DESCALE_P1
psrad mm7, DESCALE_P1
packssdw mm4, mm1 ; mm4=data7
packssdw mm2, mm7 ; mm2=data1
movq MMWORD [MMBLOCK(3,1,edx,SIZEOF_DCTELEM)], mm4
movq MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)], mm2
movq mm1, mm3
movq mm7, mm3
punpcklwd mm1, mm5
punpckhwd mm7, mm5
movq mm3, mm1
movq mm5, mm7
pmaddwd mm1, [GOTOFF(ebx,PW_MF050_MF256)] ; mm1=tmp5L
pmaddwd mm7, [GOTOFF(ebx,PW_MF050_MF256)] ; mm7=tmp5H
pmaddwd mm3, [GOTOFF(ebx,PW_MF256_F050)] ; mm3=tmp6L
pmaddwd mm5, [GOTOFF(ebx,PW_MF256_F050)] ; mm5=tmp6H
paddd mm1, mm0 ; mm1=data5L
paddd mm7, mm6 ; mm7=data5H
paddd mm3, MMWORD [wk(0)] ; mm3=data3L
paddd mm5, MMWORD [wk(1)] ; mm5=data3H
paddd mm1, [GOTOFF(ebx,PD_DESCALE_P1)]
paddd mm7, [GOTOFF(ebx,PD_DESCALE_P1)]
psrad mm1, DESCALE_P1
psrad mm7, DESCALE_P1
paddd mm3, [GOTOFF(ebx,PD_DESCALE_P1)]
paddd mm5, [GOTOFF(ebx,PD_DESCALE_P1)]
psrad mm3, DESCALE_P1
psrad mm5, DESCALE_P1
packssdw mm1, mm7 ; mm1=data5
packssdw mm3, mm5 ; mm3=data3
movq MMWORD [MMBLOCK(1,1,edx,SIZEOF_DCTELEM)], mm1
movq MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)], mm3
add edx, byte 4*DCTSIZE*SIZEOF_DCTELEM
dec ecx
jnz near .rowloop
; ---- Pass 2: process columns.
mov edx, POINTER [data(eax)] ; (DCTELEM *)
mov ecx, DCTSIZE/4
alignx 16, 7
.columnloop:
movq mm0, MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)]
movq mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)]
movq mm2, MMWORD [MMBLOCK(6,0,edx,SIZEOF_DCTELEM)]
movq mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_DCTELEM)]
; mm0=(02 12 22 32), mm2=(42 52 62 72)
; mm1=(03 13 23 33), mm3=(43 53 63 73)
movq mm4, mm0 ; transpose coefficients(phase 1)
punpcklwd mm0, mm1 ; mm0=(02 03 12 13)
punpckhwd mm4, mm1 ; mm4=(22 23 32 33)
movq mm5, mm2 ; transpose coefficients(phase 1)
punpcklwd mm2, mm3 ; mm2=(42 43 52 53)
punpckhwd mm5, mm3 ; mm5=(62 63 72 73)
movq mm6, MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)]
movq mm7, MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)]
movq mm1, MMWORD [MMBLOCK(4,0,edx,SIZEOF_DCTELEM)]
movq mm3, MMWORD [MMBLOCK(5,0,edx,SIZEOF_DCTELEM)]
; mm6=(00 10 20 30), mm1=(40 50 60 70)
; mm7=(01 11 21 31), mm3=(41 51 61 71)
movq MMWORD [wk(0)], mm4 ; wk(0)=(22 23 32 33)
movq MMWORD [wk(1)], mm2 ; wk(1)=(42 43 52 53)
movq mm4, mm6 ; transpose coefficients(phase 1)
punpcklwd mm6, mm7 ; mm6=(00 01 10 11)
punpckhwd mm4, mm7 ; mm4=(20 21 30 31)
movq mm2, mm1 ; transpose coefficients(phase 1)
punpcklwd mm1, mm3 ; mm1=(40 41 50 51)
punpckhwd mm2, mm3 ; mm2=(60 61 70 71)
movq mm7, mm6 ; transpose coefficients(phase 2)
punpckldq mm6, mm0 ; mm6=(00 01 02 03)=data0
punpckhdq mm7, mm0 ; mm7=(10 11 12 13)=data1
movq mm3, mm2 ; transpose coefficients(phase 2)
punpckldq mm2, mm5 ; mm2=(60 61 62 63)=data6
punpckhdq mm3, mm5 ; mm3=(70 71 72 73)=data7
movq mm0, mm7
movq mm5, mm6
psubw mm7, mm2 ; mm7=data1-data6=tmp6
psubw mm6, mm3 ; mm6=data0-data7=tmp7
paddw mm0, mm2 ; mm0=data1+data6=tmp1
paddw mm5, mm3 ; mm5=data0+data7=tmp0
movq mm2, MMWORD [wk(0)] ; mm2=(22 23 32 33)
movq mm3, MMWORD [wk(1)] ; mm3=(42 43 52 53)
movq MMWORD [wk(0)], mm7 ; wk(0)=tmp6
movq MMWORD [wk(1)], mm6 ; wk(1)=tmp7
movq mm7, mm4 ; transpose coefficients(phase 2)
punpckldq mm4, mm2 ; mm4=(20 21 22 23)=data2
punpckhdq mm7, mm2 ; mm7=(30 31 32 33)=data3
movq mm6, mm1 ; transpose coefficients(phase 2)
punpckldq mm1, mm3 ; mm1=(40 41 42 43)=data4
punpckhdq mm6, mm3 ; mm6=(50 51 52 53)=data5
movq mm2, mm7
movq mm3, mm4
paddw mm7, mm1 ; mm7=data3+data4=tmp3
paddw mm4, mm6 ; mm4=data2+data5=tmp2
psubw mm2, mm1 ; mm2=data3-data4=tmp4
psubw mm3, mm6 ; mm3=data2-data5=tmp5
; -- Even part
movq mm1, mm5
movq mm6, mm0
paddw mm5, mm7 ; mm5=tmp10
paddw mm0, mm4 ; mm0=tmp11
psubw mm1, mm7 ; mm1=tmp13
psubw mm6, mm4 ; mm6=tmp12
movq mm7, mm5
paddw mm5, mm0 ; mm5=tmp10+tmp11
psubw mm7, mm0 ; mm7=tmp10-tmp11
paddw mm5, [GOTOFF(ebx,PW_DESCALE_P2X)]
paddw mm7, [GOTOFF(ebx,PW_DESCALE_P2X)]
psraw mm5, PASS1_BITS ; mm5=data0
psraw mm7, PASS1_BITS ; mm7=data4
movq MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)], mm5
movq MMWORD [MMBLOCK(4,0,edx,SIZEOF_DCTELEM)], mm7
; (Original)
; z1 = (tmp12 + tmp13) * 0.541196100;
; data2 = z1 + tmp13 * 0.765366865;
; data6 = z1 + tmp12 * -1.847759065;
;
; (This implementation)
; data2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100;
; data6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065);
movq mm4, mm1 ; mm1=tmp13
movq mm0, mm1
punpcklwd mm4, mm6 ; mm6=tmp12
punpckhwd mm0, mm6
movq mm1, mm4
movq mm6, mm0
pmaddwd mm4, [GOTOFF(ebx,PW_F130_F054)] ; mm4=data2L
pmaddwd mm0, [GOTOFF(ebx,PW_F130_F054)] ; mm0=data2H
pmaddwd mm1, [GOTOFF(ebx,PW_F054_MF130)] ; mm1=data6L
pmaddwd mm6, [GOTOFF(ebx,PW_F054_MF130)] ; mm6=data6H
paddd mm4, [GOTOFF(ebx,PD_DESCALE_P2)]
paddd mm0, [GOTOFF(ebx,PD_DESCALE_P2)]
psrad mm4, DESCALE_P2
psrad mm0, DESCALE_P2
paddd mm1, [GOTOFF(ebx,PD_DESCALE_P2)]
paddd mm6, [GOTOFF(ebx,PD_DESCALE_P2)]
psrad mm1, DESCALE_P2
psrad mm6, DESCALE_P2
packssdw mm4, mm0 ; mm4=data2
packssdw mm1, mm6 ; mm1=data6
movq MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)], mm4
movq MMWORD [MMBLOCK(6,0,edx,SIZEOF_DCTELEM)], mm1
; -- Odd part
movq mm5, MMWORD [wk(0)] ; mm5=tmp6
movq mm7, MMWORD [wk(1)] ; mm7=tmp7
movq mm0, mm2 ; mm2=tmp4
movq mm6, mm3 ; mm3=tmp5
paddw mm0, mm5 ; mm0=z3
paddw mm6, mm7 ; mm6=z4
; (Original)
; z5 = (z3 + z4) * 1.175875602;
; z3 = z3 * -1.961570560; z4 = z4 * -0.390180644;
; z3 += z5; z4 += z5;
;
; (This implementation)
; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);
movq mm4, mm0
movq mm1, mm0
punpcklwd mm4, mm6
punpckhwd mm1, mm6
movq mm0, mm4
movq mm6, mm1
pmaddwd mm4, [GOTOFF(ebx,PW_MF078_F117)] ; mm4=z3L
pmaddwd mm1, [GOTOFF(ebx,PW_MF078_F117)] ; mm1=z3H
pmaddwd mm0, [GOTOFF(ebx,PW_F117_F078)] ; mm0=z4L
pmaddwd mm6, [GOTOFF(ebx,PW_F117_F078)] ; mm6=z4H
movq MMWORD [wk(0)], mm4 ; wk(0)=z3L
movq MMWORD [wk(1)], mm1 ; wk(1)=z3H
; (Original)
; z1 = tmp4 + tmp7; z2 = tmp5 + tmp6;
; tmp4 = tmp4 * 0.298631336; tmp5 = tmp5 * 2.053119869;
; tmp6 = tmp6 * 3.072711026; tmp7 = tmp7 * 1.501321110;
; z1 = z1 * -0.899976223; z2 = z2 * -2.562915447;
; data7 = tmp4 + z1 + z3; data5 = tmp5 + z2 + z4;
; data3 = tmp6 + z2 + z3; data1 = tmp7 + z1 + z4;
;
; (This implementation)
; tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223;
; tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447;
; tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447);
; tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223);
; data7 = tmp4 + z3; data5 = tmp5 + z4;
; data3 = tmp6 + z3; data1 = tmp7 + z4;
movq mm4, mm2
movq mm1, mm2
punpcklwd mm4, mm7
punpckhwd mm1, mm7
movq mm2, mm4
movq mm7, mm1
pmaddwd mm4, [GOTOFF(ebx,PW_MF060_MF089)] ; mm4=tmp4L
pmaddwd mm1, [GOTOFF(ebx,PW_MF060_MF089)] ; mm1=tmp4H
pmaddwd mm2, [GOTOFF(ebx,PW_MF089_F060)] ; mm2=tmp7L
pmaddwd mm7, [GOTOFF(ebx,PW_MF089_F060)] ; mm7=tmp7H
paddd mm4, MMWORD [wk(0)] ; mm4=data7L
paddd mm1, MMWORD [wk(1)] ; mm1=data7H
paddd mm2, mm0 ; mm2=data1L
paddd mm7, mm6 ; mm7=data1H
paddd mm4, [GOTOFF(ebx,PD_DESCALE_P2)]
paddd mm1, [GOTOFF(ebx,PD_DESCALE_P2)]
psrad mm4, DESCALE_P2
psrad mm1, DESCALE_P2
paddd mm2, [GOTOFF(ebx,PD_DESCALE_P2)]
paddd mm7, [GOTOFF(ebx,PD_DESCALE_P2)]
psrad mm2, DESCALE_P2
psrad mm7, DESCALE_P2
packssdw mm4, mm1 ; mm4=data7
packssdw mm2, mm7 ; mm2=data1
movq MMWORD [MMBLOCK(7,0,edx,SIZEOF_DCTELEM)], mm4
movq MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)], mm2
movq mm1, mm3
movq mm7, mm3
punpcklwd mm1, mm5
punpckhwd mm7, mm5
movq mm3, mm1
movq mm5, mm7
pmaddwd mm1, [GOTOFF(ebx,PW_MF050_MF256)] ; mm1=tmp5L
pmaddwd mm7, [GOTOFF(ebx,PW_MF050_MF256)] ; mm7=tmp5H
pmaddwd mm3, [GOTOFF(ebx,PW_MF256_F050)] ; mm3=tmp6L
pmaddwd mm5, [GOTOFF(ebx,PW_MF256_F050)] ; mm5=tmp6H
paddd mm1, mm0 ; mm1=data5L
paddd mm7, mm6 ; mm7=data5H
paddd mm3, MMWORD [wk(0)] ; mm3=data3L
paddd mm5, MMWORD [wk(1)] ; mm5=data3H
paddd mm1, [GOTOFF(ebx,PD_DESCALE_P2)]
paddd mm7, [GOTOFF(ebx,PD_DESCALE_P2)]
psrad mm1, DESCALE_P2
psrad mm7, DESCALE_P2
paddd mm3, [GOTOFF(ebx,PD_DESCALE_P2)]
paddd mm5, [GOTOFF(ebx,PD_DESCALE_P2)]
psrad mm3, DESCALE_P2
psrad mm5, DESCALE_P2
packssdw mm1, mm7 ; mm1=data5
packssdw mm3, mm5 ; mm3=data3
movq MMWORD [MMBLOCK(5,0,edx,SIZEOF_DCTELEM)], mm1
movq MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)], mm3
add edx, byte 4*SIZEOF_DCTELEM
dec ecx
jnz near .columnloop
emms ; empty MMX state
; pop edi ; unused
; pop esi ; unused
; 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
; For some reason, the OS X linker does not honor the request to align the
; segment unless we do this.
align 32