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mozjpeg/simd/i386/jfdctint-mmx.asm
DRC 19c791cdac Improve code formatting consistency 
With rare exceptions ...
- Always separate line continuation characters by one space from
  preceding code.
- Always use two-space indentation.  Never use tabs.
- Always use K&R-style conditional blocks.
- Always surround operators with spaces, except in raw assembly code.
- Always put a space after, but not before, a comma.
- Never put a space between type casts and variables/function calls.
- Never put a space between the function name and the argument list in
  function declarations and prototypes.
- Always surround braces ('{' and '}') with spaces.
- Always surround statements (if, for, else, catch, while, do, switch)
  with spaces.
- Always attach pointer symbols ('*' and '**') to the variable or
  function name.
- Always precede pointer symbols ('*' and '**') by a space in type
  casts.
- Use the MIN() macro from jpegint.h within the libjpeg and TurboJPEG
  API libraries (using min() from tjutil.h is still necessary for
  TJBench.)
- Where it makes sense (particularly in the TurboJPEG code), put a blank
  line after variable declaration blocks.
- Always separate statements in one-liners by two spaces.

The purpose of this was to ease maintenance on my part and also to make
it easier for contributors to figure out how to format patch
submissions.  This was admittedly confusing (even to me sometimes) when
we had 3 or 4 different style conventions in the same source tree.  The
new convention is more consistent with the formatting of other OSS code
bases.

This commit corrects deviations from the chosen formatting style in the
libjpeg API code and reformats the TurboJPEG API code such that it
conforms to the same standard.

NOTES:
- Although it is no longer necessary for the function name in function
  declarations to begin in Column 1 (this was historically necessary
  because of the ansi2knr utility, which allowed libjpeg to be built
  with non-ANSI compilers), we retain that formatting for the libjpeg
  code because it improves readability when using libjpeg's function
  attribute macros (GLOBAL(), etc.)
- This reformatting project was accomplished with the help of AStyle and
  Uncrustify, although neither was completely up to the task, and thus
  a great deal of manual tweaking was required.  Note to developers of
  code formatting utilities:  the libjpeg-turbo code base is an
  excellent test bed, because AFAICT, it breaks every single one of the
  utilities that are currently available.
- The legacy (MMX, SSE, 3DNow!) assembly code for i386 has been
  formatted to match the SSE2 code (refer to
  ff5685d5344273df321eb63a005eaae19d2496e3.)  I hadn't intended to
  bother with this, but the Loongson MMI implementation demonstrated
  that there is still academic value to the MMX implementation, as an
  algorithmic model for other 64-bit vector implementations.  Thus, it
  is desirable to improve its readability in the same manner as that of
  the SSE2 implementation.
2018-03-16 02:14:34 -05:00

623 lines
24 KiB
NASM
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;
; jfdctint.asm - accurate integer FDCT (MMX)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright (C) 2016, 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 slow-but-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.
;
; [TAB8]
%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
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