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mozjpeg/simd/i386/jidctint-mmx.asm
DRC 6e632af9f6 Demote "fast" [I]DCT algorithms to legacy status 
- Refer to the "slow" [I]DCT algorithms as "accurate" instead, since
  they are not slow under libjpeg-turbo.
- Adjust documentation claims to reflect the fact that the "slow" and
  "fast" algorithms produce about the same performance on AVX2-equipped
  CPUs (because of the dual-lane nature of AVX2, it was not possible to
  accelerate the "fast" algorithm beyond what was achievable with SSE2.)
  Also adjust the claims to reflect the fact that the "fast" algorithm
  tends to be ~5-15% faster than the "slow" algorithm on
  non-AVX2-equipped CPUs, regardless of the use of the libjpeg-turbo
  SIMD extensions.
- Indicate the legacy status of the "fast" and float algorithms in the
  documentation and cjpeg/djpeg usage info.
- Remove obsolete paragraph in the djpeg man page that suggested that
  the float algorithm could be faster than the "fast" algorithm on some
  CPUs.
2020-11-05 15:59:31 -06:00

852 lines
33 KiB
NASM
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;
; jidctint.asm - accurate integer IDCT (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
; inverse DCT (Discrete Cosine Transform). The following code is based
; directly on the IJG's original jidctint.c; see the jidctint.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 + 3)
%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_idct_islow_mmx)
EXTN(jconst_idct_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)
PB_CENTERJSAMP times 8 db CENTERJSAMPLE
alignz 32
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
;
; Perform dequantization and inverse DCT on one block of coefficients.
;
; GLOBAL(void)
; jsimd_idct_islow_mmx(void *dct_table, JCOEFPTR coef_block,
; JSAMPARRAY output_buf, JDIMENSION output_col)
;
%define dct_table(b) (b) + 8 ; jpeg_component_info *compptr
%define coef_block(b) (b) + 12 ; JCOEFPTR coef_block
%define output_buf(b) (b) + 16 ; JSAMPARRAY output_buf
%define output_col(b) (b) + 20 ; JDIMENSION output_col
%define original_ebp ebp + 0
%define wk(i) ebp - (WK_NUM - (i)) * SIZEOF_MMWORD
; mmword wk[WK_NUM]
%define WK_NUM 12
%define workspace wk(0) - DCTSIZE2 * SIZEOF_JCOEF
; JCOEF workspace[DCTSIZE2]
align 32
GLOBAL_FUNCTION(jsimd_idct_islow_mmx)
EXTN(jsimd_idct_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, [workspace]
push ebx
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
get_GOT ebx ; get GOT address
; ---- Pass 1: process columns from input, store into work array.
; mov eax, [original_ebp]
mov edx, POINTER [dct_table(eax)] ; quantptr
mov esi, JCOEFPTR [coef_block(eax)] ; inptr
lea edi, [workspace] ; JCOEF *wsptr
mov ecx, DCTSIZE/4 ; ctr
alignx 16, 7
.columnloop:
%ifndef NO_ZERO_COLUMN_TEST_ISLOW_MMX
mov eax, dword [DWBLOCK(1,0,esi,SIZEOF_JCOEF)]
or eax, dword [DWBLOCK(2,0,esi,SIZEOF_JCOEF)]
jnz short .columnDCT
movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
por mm0, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
por mm1, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
por mm0, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
por mm1, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
por mm0, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
por mm1, mm0
packsswb mm1, mm1
movd eax, mm1
test eax, eax
jnz short .columnDCT
; -- AC terms all zero
movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
psllw mm0, PASS1_BITS
movq mm2, mm0 ; mm0=in0=(00 01 02 03)
punpcklwd mm0, mm0 ; mm0=(00 00 01 01)
punpckhwd mm2, mm2 ; mm2=(02 02 03 03)
movq mm1, mm0
punpckldq mm0, mm0 ; mm0=(00 00 00 00)
punpckhdq mm1, mm1 ; mm1=(01 01 01 01)
movq mm3, mm2
punpckldq mm2, mm2 ; mm2=(02 02 02 02)
punpckhdq mm3, mm3 ; mm3=(03 03 03 03)
movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm0
movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm0
movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2
movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2
movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3
movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm3
jmp near .nextcolumn
alignx 16, 7
%endif
.columnDCT:
; -- Even part
movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm1, MMWORD [MMBLOCK(2,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
pmullw mm2, MMWORD [MMBLOCK(4,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm3, MMWORD [MMBLOCK(6,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
; (Original)
; z1 = (z2 + z3) * 0.541196100;
; tmp2 = z1 + z3 * -1.847759065;
; tmp3 = z1 + z2 * 0.765366865;
;
; (This implementation)
; tmp2 = z2 * 0.541196100 + z3 * (0.541196100 - 1.847759065);
; tmp3 = z2 * (0.541196100 + 0.765366865) + z3 * 0.541196100;
movq mm4, mm1 ; mm1=in2=z2
movq mm5, mm1
punpcklwd mm4, mm3 ; mm3=in6=z3
punpckhwd mm5, mm3
movq mm1, mm4
movq mm3, mm5
pmaddwd mm4, [GOTOFF(ebx,PW_F130_F054)] ; mm4=tmp3L
pmaddwd mm5, [GOTOFF(ebx,PW_F130_F054)] ; mm5=tmp3H
pmaddwd mm1, [GOTOFF(ebx,PW_F054_MF130)] ; mm1=tmp2L
pmaddwd mm3, [GOTOFF(ebx,PW_F054_MF130)] ; mm3=tmp2H
movq mm6, mm0
paddw mm0, mm2 ; mm0=in0+in4
psubw mm6, mm2 ; mm6=in0-in4
pxor mm7, mm7
pxor mm2, mm2
punpcklwd mm7, mm0 ; mm7=tmp0L
punpckhwd mm2, mm0 ; mm2=tmp0H
psrad mm7, (16-CONST_BITS) ; psrad mm7,16 & pslld mm7,CONST_BITS
psrad mm2, (16-CONST_BITS) ; psrad mm2,16 & pslld mm2,CONST_BITS
movq mm0, mm7
paddd mm7, mm4 ; mm7=tmp10L
psubd mm0, mm4 ; mm0=tmp13L
movq mm4, mm2
paddd mm2, mm5 ; mm2=tmp10H
psubd mm4, mm5 ; mm4=tmp13H
movq MMWORD [wk(0)], mm7 ; wk(0)=tmp10L
movq MMWORD [wk(1)], mm2 ; wk(1)=tmp10H
movq MMWORD [wk(2)], mm0 ; wk(2)=tmp13L
movq MMWORD [wk(3)], mm4 ; wk(3)=tmp13H
pxor mm5, mm5
pxor mm7, mm7
punpcklwd mm5, mm6 ; mm5=tmp1L
punpckhwd mm7, mm6 ; mm7=tmp1H
psrad mm5, (16-CONST_BITS) ; psrad mm5,16 & pslld mm5,CONST_BITS
psrad mm7, (16-CONST_BITS) ; psrad mm7,16 & pslld mm7,CONST_BITS
movq mm2, mm5
paddd mm5, mm1 ; mm5=tmp11L
psubd mm2, mm1 ; mm2=tmp12L
movq mm0, mm7
paddd mm7, mm3 ; mm7=tmp11H
psubd mm0, mm3 ; mm0=tmp12H
movq MMWORD [wk(4)], mm5 ; wk(4)=tmp11L
movq MMWORD [wk(5)], mm7 ; wk(5)=tmp11H
movq MMWORD [wk(6)], mm2 ; wk(6)=tmp12L
movq MMWORD [wk(7)], mm0 ; wk(7)=tmp12H
; -- Odd part
movq mm4, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm6, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
pmullw mm4, MMWORD [MMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm6, MMWORD [MMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm1, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
pmullw mm1, MMWORD [MMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm5, mm6
movq mm7, mm4
paddw mm5, mm3 ; mm5=z3
paddw mm7, mm1 ; mm7=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 mm2, mm5
movq mm0, mm5
punpcklwd mm2, mm7
punpckhwd mm0, mm7
movq mm5, mm2
movq mm7, mm0
pmaddwd mm2, [GOTOFF(ebx,PW_MF078_F117)] ; mm2=z3L
pmaddwd mm0, [GOTOFF(ebx,PW_MF078_F117)] ; mm0=z3H
pmaddwd mm5, [GOTOFF(ebx,PW_F117_F078)] ; mm5=z4L
pmaddwd mm7, [GOTOFF(ebx,PW_F117_F078)] ; mm7=z4H
movq MMWORD [wk(10)], mm2 ; wk(10)=z3L
movq MMWORD [wk(11)], mm0 ; wk(11)=z3H
; (Original)
; z1 = tmp0 + tmp3; z2 = tmp1 + tmp2;
; tmp0 = tmp0 * 0.298631336; tmp1 = tmp1 * 2.053119869;
; tmp2 = tmp2 * 3.072711026; tmp3 = tmp3 * 1.501321110;
; z1 = z1 * -0.899976223; z2 = z2 * -2.562915447;
; tmp0 += z1 + z3; tmp1 += z2 + z4;
; tmp2 += z2 + z3; tmp3 += z1 + z4;
;
; (This implementation)
; tmp0 = tmp0 * (0.298631336 - 0.899976223) + tmp3 * -0.899976223;
; tmp1 = tmp1 * (2.053119869 - 2.562915447) + tmp2 * -2.562915447;
; tmp2 = tmp1 * -2.562915447 + tmp2 * (3.072711026 - 2.562915447);
; tmp3 = tmp0 * -0.899976223 + tmp3 * (1.501321110 - 0.899976223);
; tmp0 += z3; tmp1 += z4;
; tmp2 += z3; tmp3 += z4;
movq mm2, mm3
movq mm0, mm3
punpcklwd mm2, mm4
punpckhwd mm0, mm4
movq mm3, mm2
movq mm4, mm0
pmaddwd mm2, [GOTOFF(ebx,PW_MF060_MF089)] ; mm2=tmp0L
pmaddwd mm0, [GOTOFF(ebx,PW_MF060_MF089)] ; mm0=tmp0H
pmaddwd mm3, [GOTOFF(ebx,PW_MF089_F060)] ; mm3=tmp3L
pmaddwd mm4, [GOTOFF(ebx,PW_MF089_F060)] ; mm4=tmp3H
paddd mm2, MMWORD [wk(10)] ; mm2=tmp0L
paddd mm0, MMWORD [wk(11)] ; mm0=tmp0H
paddd mm3, mm5 ; mm3=tmp3L
paddd mm4, mm7 ; mm4=tmp3H
movq MMWORD [wk(8)], mm2 ; wk(8)=tmp0L
movq MMWORD [wk(9)], mm0 ; wk(9)=tmp0H
movq mm2, mm1
movq mm0, mm1
punpcklwd mm2, mm6
punpckhwd mm0, mm6
movq mm1, mm2
movq mm6, mm0
pmaddwd mm2, [GOTOFF(ebx,PW_MF050_MF256)] ; mm2=tmp1L
pmaddwd mm0, [GOTOFF(ebx,PW_MF050_MF256)] ; mm0=tmp1H
pmaddwd mm1, [GOTOFF(ebx,PW_MF256_F050)] ; mm1=tmp2L
pmaddwd mm6, [GOTOFF(ebx,PW_MF256_F050)] ; mm6=tmp2H
paddd mm2, mm5 ; mm2=tmp1L
paddd mm0, mm7 ; mm0=tmp1H
paddd mm1, MMWORD [wk(10)] ; mm1=tmp2L
paddd mm6, MMWORD [wk(11)] ; mm6=tmp2H
movq MMWORD [wk(10)], mm2 ; wk(10)=tmp1L
movq MMWORD [wk(11)], mm0 ; wk(11)=tmp1H
; -- Final output stage
movq mm5, MMWORD [wk(0)] ; mm5=tmp10L
movq mm7, MMWORD [wk(1)] ; mm7=tmp10H
movq mm2, mm5
movq mm0, mm7
paddd mm5, mm3 ; mm5=data0L
paddd mm7, mm4 ; mm7=data0H
psubd mm2, mm3 ; mm2=data7L
psubd mm0, mm4 ; mm0=data7H
movq mm3, [GOTOFF(ebx,PD_DESCALE_P1)] ; mm3=[PD_DESCALE_P1]
paddd mm5, mm3
paddd mm7, mm3
psrad mm5, DESCALE_P1
psrad mm7, DESCALE_P1
paddd mm2, mm3
paddd mm0, mm3
psrad mm2, DESCALE_P1
psrad mm0, DESCALE_P1
packssdw mm5, mm7 ; mm5=data0=(00 01 02 03)
packssdw mm2, mm0 ; mm2=data7=(70 71 72 73)
movq mm4, MMWORD [wk(4)] ; mm4=tmp11L
movq mm3, MMWORD [wk(5)] ; mm3=tmp11H
movq mm7, mm4
movq mm0, mm3
paddd mm4, mm1 ; mm4=data1L
paddd mm3, mm6 ; mm3=data1H
psubd mm7, mm1 ; mm7=data6L
psubd mm0, mm6 ; mm0=data6H
movq mm1, [GOTOFF(ebx,PD_DESCALE_P1)] ; mm1=[PD_DESCALE_P1]
paddd mm4, mm1
paddd mm3, mm1
psrad mm4, DESCALE_P1
psrad mm3, DESCALE_P1
paddd mm7, mm1
paddd mm0, mm1
psrad mm7, DESCALE_P1
psrad mm0, DESCALE_P1
packssdw mm4, mm3 ; mm4=data1=(10 11 12 13)
packssdw mm7, mm0 ; mm7=data6=(60 61 62 63)
movq mm6, mm5 ; transpose coefficients(phase 1)
punpcklwd mm5, mm4 ; mm5=(00 10 01 11)
punpckhwd mm6, mm4 ; mm6=(02 12 03 13)
movq mm1, mm7 ; transpose coefficients(phase 1)
punpcklwd mm7, mm2 ; mm7=(60 70 61 71)
punpckhwd mm1, mm2 ; mm1=(62 72 63 73)
movq mm3, MMWORD [wk(6)] ; mm3=tmp12L
movq mm0, MMWORD [wk(7)] ; mm0=tmp12H
movq mm4, MMWORD [wk(10)] ; mm4=tmp1L
movq mm2, MMWORD [wk(11)] ; mm2=tmp1H
movq MMWORD [wk(0)], mm5 ; wk(0)=(00 10 01 11)
movq MMWORD [wk(1)], mm6 ; wk(1)=(02 12 03 13)
movq MMWORD [wk(4)], mm7 ; wk(4)=(60 70 61 71)
movq MMWORD [wk(5)], mm1 ; wk(5)=(62 72 63 73)
movq mm5, mm3
movq mm6, mm0
paddd mm3, mm4 ; mm3=data2L
paddd mm0, mm2 ; mm0=data2H
psubd mm5, mm4 ; mm5=data5L
psubd mm6, mm2 ; mm6=data5H
movq mm7, [GOTOFF(ebx,PD_DESCALE_P1)] ; mm7=[PD_DESCALE_P1]
paddd mm3, mm7
paddd mm0, mm7
psrad mm3, DESCALE_P1
psrad mm0, DESCALE_P1
paddd mm5, mm7
paddd mm6, mm7
psrad mm5, DESCALE_P1
psrad mm6, DESCALE_P1
packssdw mm3, mm0 ; mm3=data2=(20 21 22 23)
packssdw mm5, mm6 ; mm5=data5=(50 51 52 53)
movq mm1, MMWORD [wk(2)] ; mm1=tmp13L
movq mm4, MMWORD [wk(3)] ; mm4=tmp13H
movq mm2, MMWORD [wk(8)] ; mm2=tmp0L
movq mm7, MMWORD [wk(9)] ; mm7=tmp0H
movq mm0, mm1
movq mm6, mm4
paddd mm1, mm2 ; mm1=data3L
paddd mm4, mm7 ; mm4=data3H
psubd mm0, mm2 ; mm0=data4L
psubd mm6, mm7 ; mm6=data4H
movq mm2, [GOTOFF(ebx,PD_DESCALE_P1)] ; mm2=[PD_DESCALE_P1]
paddd mm1, mm2
paddd mm4, mm2
psrad mm1, DESCALE_P1
psrad mm4, DESCALE_P1
paddd mm0, mm2
paddd mm6, mm2
psrad mm0, DESCALE_P1
psrad mm6, DESCALE_P1
packssdw mm1, mm4 ; mm1=data3=(30 31 32 33)
packssdw mm0, mm6 ; mm0=data4=(40 41 42 43)
movq mm7, MMWORD [wk(0)] ; mm7=(00 10 01 11)
movq mm2, MMWORD [wk(1)] ; mm2=(02 12 03 13)
movq mm4, mm3 ; transpose coefficients(phase 1)
punpcklwd mm3, mm1 ; mm3=(20 30 21 31)
punpckhwd mm4, mm1 ; mm4=(22 32 23 33)
movq mm6, mm0 ; transpose coefficients(phase 1)
punpcklwd mm0, mm5 ; mm0=(40 50 41 51)
punpckhwd mm6, mm5 ; mm6=(42 52 43 53)
movq mm1, mm7 ; transpose coefficients(phase 2)
punpckldq mm7, mm3 ; mm7=(00 10 20 30)
punpckhdq mm1, mm3 ; mm1=(01 11 21 31)
movq mm5, mm2 ; transpose coefficients(phase 2)
punpckldq mm2, mm4 ; mm2=(02 12 22 32)
punpckhdq mm5, mm4 ; mm5=(03 13 23 33)
movq mm3, MMWORD [wk(4)] ; mm3=(60 70 61 71)
movq mm4, MMWORD [wk(5)] ; mm4=(62 72 63 73)
movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm7
movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2
movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm5
movq mm7, mm0 ; transpose coefficients(phase 2)
punpckldq mm0, mm3 ; mm0=(40 50 60 70)
punpckhdq mm7, mm3 ; mm7=(41 51 61 71)
movq mm1, mm6 ; transpose coefficients(phase 2)
punpckldq mm6, mm4 ; mm6=(42 52 62 72)
punpckhdq mm1, mm4 ; mm1=(43 53 63 73)
movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm0
movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm7
movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm6
movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm1
.nextcolumn:
add esi, byte 4*SIZEOF_JCOEF ; coef_block
add edx, byte 4*SIZEOF_ISLOW_MULT_TYPE ; quantptr
add edi, byte 4*DCTSIZE*SIZEOF_JCOEF ; wsptr
dec ecx ; ctr
jnz near .columnloop
; ---- Pass 2: process rows from work array, store into output array.
mov eax, [original_ebp]
lea esi, [workspace] ; JCOEF *wsptr
mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *)
mov eax, JDIMENSION [output_col(eax)]
mov ecx, DCTSIZE/4 ; ctr
alignx 16, 7
.rowloop:
; -- Even part
movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
; (Original)
; z1 = (z2 + z3) * 0.541196100;
; tmp2 = z1 + z3 * -1.847759065;
; tmp3 = z1 + z2 * 0.765366865;
;
; (This implementation)
; tmp2 = z2 * 0.541196100 + z3 * (0.541196100 - 1.847759065);
; tmp3 = z2 * (0.541196100 + 0.765366865) + z3 * 0.541196100;
movq mm4, mm1 ; mm1=in2=z2
movq mm5, mm1
punpcklwd mm4, mm3 ; mm3=in6=z3
punpckhwd mm5, mm3
movq mm1, mm4
movq mm3, mm5
pmaddwd mm4, [GOTOFF(ebx,PW_F130_F054)] ; mm4=tmp3L
pmaddwd mm5, [GOTOFF(ebx,PW_F130_F054)] ; mm5=tmp3H
pmaddwd mm1, [GOTOFF(ebx,PW_F054_MF130)] ; mm1=tmp2L
pmaddwd mm3, [GOTOFF(ebx,PW_F054_MF130)] ; mm3=tmp2H
movq mm6, mm0
paddw mm0, mm2 ; mm0=in0+in4
psubw mm6, mm2 ; mm6=in0-in4
pxor mm7, mm7
pxor mm2, mm2
punpcklwd mm7, mm0 ; mm7=tmp0L
punpckhwd mm2, mm0 ; mm2=tmp0H
psrad mm7, (16-CONST_BITS) ; psrad mm7,16 & pslld mm7,CONST_BITS
psrad mm2, (16-CONST_BITS) ; psrad mm2,16 & pslld mm2,CONST_BITS
movq mm0, mm7
paddd mm7, mm4 ; mm7=tmp10L
psubd mm0, mm4 ; mm0=tmp13L
movq mm4, mm2
paddd mm2, mm5 ; mm2=tmp10H
psubd mm4, mm5 ; mm4=tmp13H
movq MMWORD [wk(0)], mm7 ; wk(0)=tmp10L
movq MMWORD [wk(1)], mm2 ; wk(1)=tmp10H
movq MMWORD [wk(2)], mm0 ; wk(2)=tmp13L
movq MMWORD [wk(3)], mm4 ; wk(3)=tmp13H
pxor mm5, mm5
pxor mm7, mm7
punpcklwd mm5, mm6 ; mm5=tmp1L
punpckhwd mm7, mm6 ; mm7=tmp1H
psrad mm5, (16-CONST_BITS) ; psrad mm5,16 & pslld mm5,CONST_BITS
psrad mm7, (16-CONST_BITS) ; psrad mm7,16 & pslld mm7,CONST_BITS
movq mm2, mm5
paddd mm5, mm1 ; mm5=tmp11L
psubd mm2, mm1 ; mm2=tmp12L
movq mm0, mm7
paddd mm7, mm3 ; mm7=tmp11H
psubd mm0, mm3 ; mm0=tmp12H
movq MMWORD [wk(4)], mm5 ; wk(4)=tmp11L
movq MMWORD [wk(5)], mm7 ; wk(5)=tmp11H
movq MMWORD [wk(6)], mm2 ; wk(6)=tmp12L
movq MMWORD [wk(7)], mm0 ; wk(7)=tmp12H
; -- Odd part
movq mm4, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm6, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
movq mm5, mm6
movq mm7, mm4
paddw mm5, mm3 ; mm5=z3
paddw mm7, mm1 ; mm7=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 mm2, mm5
movq mm0, mm5
punpcklwd mm2, mm7
punpckhwd mm0, mm7
movq mm5, mm2
movq mm7, mm0
pmaddwd mm2, [GOTOFF(ebx,PW_MF078_F117)] ; mm2=z3L
pmaddwd mm0, [GOTOFF(ebx,PW_MF078_F117)] ; mm0=z3H
pmaddwd mm5, [GOTOFF(ebx,PW_F117_F078)] ; mm5=z4L
pmaddwd mm7, [GOTOFF(ebx,PW_F117_F078)] ; mm7=z4H
movq MMWORD [wk(10)], mm2 ; wk(10)=z3L
movq MMWORD [wk(11)], mm0 ; wk(11)=z3H
; (Original)
; z1 = tmp0 + tmp3; z2 = tmp1 + tmp2;
; tmp0 = tmp0 * 0.298631336; tmp1 = tmp1 * 2.053119869;
; tmp2 = tmp2 * 3.072711026; tmp3 = tmp3 * 1.501321110;
; z1 = z1 * -0.899976223; z2 = z2 * -2.562915447;
; tmp0 += z1 + z3; tmp1 += z2 + z4;
; tmp2 += z2 + z3; tmp3 += z1 + z4;
;
; (This implementation)
; tmp0 = tmp0 * (0.298631336 - 0.899976223) + tmp3 * -0.899976223;
; tmp1 = tmp1 * (2.053119869 - 2.562915447) + tmp2 * -2.562915447;
; tmp2 = tmp1 * -2.562915447 + tmp2 * (3.072711026 - 2.562915447);
; tmp3 = tmp0 * -0.899976223 + tmp3 * (1.501321110 - 0.899976223);
; tmp0 += z3; tmp1 += z4;
; tmp2 += z3; tmp3 += z4;
movq mm2, mm3
movq mm0, mm3
punpcklwd mm2, mm4
punpckhwd mm0, mm4
movq mm3, mm2
movq mm4, mm0
pmaddwd mm2, [GOTOFF(ebx,PW_MF060_MF089)] ; mm2=tmp0L
pmaddwd mm0, [GOTOFF(ebx,PW_MF060_MF089)] ; mm0=tmp0H
pmaddwd mm3, [GOTOFF(ebx,PW_MF089_F060)] ; mm3=tmp3L
pmaddwd mm4, [GOTOFF(ebx,PW_MF089_F060)] ; mm4=tmp3H
paddd mm2, MMWORD [wk(10)] ; mm2=tmp0L
paddd mm0, MMWORD [wk(11)] ; mm0=tmp0H
paddd mm3, mm5 ; mm3=tmp3L
paddd mm4, mm7 ; mm4=tmp3H
movq MMWORD [wk(8)], mm2 ; wk(8)=tmp0L
movq MMWORD [wk(9)], mm0 ; wk(9)=tmp0H
movq mm2, mm1
movq mm0, mm1
punpcklwd mm2, mm6
punpckhwd mm0, mm6
movq mm1, mm2
movq mm6, mm0
pmaddwd mm2, [GOTOFF(ebx,PW_MF050_MF256)] ; mm2=tmp1L
pmaddwd mm0, [GOTOFF(ebx,PW_MF050_MF256)] ; mm0=tmp1H
pmaddwd mm1, [GOTOFF(ebx,PW_MF256_F050)] ; mm1=tmp2L
pmaddwd mm6, [GOTOFF(ebx,PW_MF256_F050)] ; mm6=tmp2H
paddd mm2, mm5 ; mm2=tmp1L
paddd mm0, mm7 ; mm0=tmp1H
paddd mm1, MMWORD [wk(10)] ; mm1=tmp2L
paddd mm6, MMWORD [wk(11)] ; mm6=tmp2H
movq MMWORD [wk(10)], mm2 ; wk(10)=tmp1L
movq MMWORD [wk(11)], mm0 ; wk(11)=tmp1H
; -- Final output stage
movq mm5, MMWORD [wk(0)] ; mm5=tmp10L
movq mm7, MMWORD [wk(1)] ; mm7=tmp10H
movq mm2, mm5
movq mm0, mm7
paddd mm5, mm3 ; mm5=data0L
paddd mm7, mm4 ; mm7=data0H
psubd mm2, mm3 ; mm2=data7L
psubd mm0, mm4 ; mm0=data7H
movq mm3, [GOTOFF(ebx,PD_DESCALE_P2)] ; mm3=[PD_DESCALE_P2]
paddd mm5, mm3
paddd mm7, mm3
psrad mm5, DESCALE_P2
psrad mm7, DESCALE_P2
paddd mm2, mm3
paddd mm0, mm3
psrad mm2, DESCALE_P2
psrad mm0, DESCALE_P2
packssdw mm5, mm7 ; mm5=data0=(00 10 20 30)
packssdw mm2, mm0 ; mm2=data7=(07 17 27 37)
movq mm4, MMWORD [wk(4)] ; mm4=tmp11L
movq mm3, MMWORD [wk(5)] ; mm3=tmp11H
movq mm7, mm4
movq mm0, mm3
paddd mm4, mm1 ; mm4=data1L
paddd mm3, mm6 ; mm3=data1H
psubd mm7, mm1 ; mm7=data6L
psubd mm0, mm6 ; mm0=data6H
movq mm1, [GOTOFF(ebx,PD_DESCALE_P2)] ; mm1=[PD_DESCALE_P2]
paddd mm4, mm1
paddd mm3, mm1
psrad mm4, DESCALE_P2
psrad mm3, DESCALE_P2
paddd mm7, mm1
paddd mm0, mm1
psrad mm7, DESCALE_P2
psrad mm0, DESCALE_P2
packssdw mm4, mm3 ; mm4=data1=(01 11 21 31)
packssdw mm7, mm0 ; mm7=data6=(06 16 26 36)
packsswb mm5, mm7 ; mm5=(00 10 20 30 06 16 26 36)
packsswb mm4, mm2 ; mm4=(01 11 21 31 07 17 27 37)
movq mm6, MMWORD [wk(6)] ; mm6=tmp12L
movq mm1, MMWORD [wk(7)] ; mm1=tmp12H
movq mm3, MMWORD [wk(10)] ; mm3=tmp1L
movq mm0, MMWORD [wk(11)] ; mm0=tmp1H
movq MMWORD [wk(0)], mm5 ; wk(0)=(00 10 20 30 06 16 26 36)
movq MMWORD [wk(1)], mm4 ; wk(1)=(01 11 21 31 07 17 27 37)
movq mm7, mm6
movq mm2, mm1
paddd mm6, mm3 ; mm6=data2L
paddd mm1, mm0 ; mm1=data2H
psubd mm7, mm3 ; mm7=data5L
psubd mm2, mm0 ; mm2=data5H
movq mm5, [GOTOFF(ebx,PD_DESCALE_P2)] ; mm5=[PD_DESCALE_P2]
paddd mm6, mm5
paddd mm1, mm5
psrad mm6, DESCALE_P2
psrad mm1, DESCALE_P2
paddd mm7, mm5
paddd mm2, mm5
psrad mm7, DESCALE_P2
psrad mm2, DESCALE_P2
packssdw mm6, mm1 ; mm6=data2=(02 12 22 32)
packssdw mm7, mm2 ; mm7=data5=(05 15 25 35)
movq mm4, MMWORD [wk(2)] ; mm4=tmp13L
movq mm3, MMWORD [wk(3)] ; mm3=tmp13H
movq mm0, MMWORD [wk(8)] ; mm0=tmp0L
movq mm5, MMWORD [wk(9)] ; mm5=tmp0H
movq mm1, mm4
movq mm2, mm3
paddd mm4, mm0 ; mm4=data3L
paddd mm3, mm5 ; mm3=data3H
psubd mm1, mm0 ; mm1=data4L
psubd mm2, mm5 ; mm2=data4H
movq mm0, [GOTOFF(ebx,PD_DESCALE_P2)] ; mm0=[PD_DESCALE_P2]
paddd mm4, mm0
paddd mm3, mm0
psrad mm4, DESCALE_P2
psrad mm3, DESCALE_P2
paddd mm1, mm0
paddd mm2, mm0
psrad mm1, DESCALE_P2
psrad mm2, DESCALE_P2
movq mm5, [GOTOFF(ebx,PB_CENTERJSAMP)] ; mm5=[PB_CENTERJSAMP]
packssdw mm4, mm3 ; mm4=data3=(03 13 23 33)
packssdw mm1, mm2 ; mm1=data4=(04 14 24 34)
movq mm0, MMWORD [wk(0)] ; mm0=(00 10 20 30 06 16 26 36)
movq mm3, MMWORD [wk(1)] ; mm3=(01 11 21 31 07 17 27 37)
packsswb mm6, mm1 ; mm6=(02 12 22 32 04 14 24 34)
packsswb mm4, mm7 ; mm4=(03 13 23 33 05 15 25 35)
paddb mm0, mm5
paddb mm3, mm5
paddb mm6, mm5
paddb mm4, mm5
movq mm2, mm0 ; transpose coefficients(phase 1)
punpcklbw mm0, mm3 ; mm0=(00 01 10 11 20 21 30 31)
punpckhbw mm2, mm3 ; mm2=(06 07 16 17 26 27 36 37)
movq mm1, mm6 ; transpose coefficients(phase 1)
punpcklbw mm6, mm4 ; mm6=(02 03 12 13 22 23 32 33)
punpckhbw mm1, mm4 ; mm1=(04 05 14 15 24 25 34 35)
movq mm7, mm0 ; transpose coefficients(phase 2)
punpcklwd mm0, mm6 ; mm0=(00 01 02 03 10 11 12 13)
punpckhwd mm7, mm6 ; mm7=(20 21 22 23 30 31 32 33)
movq mm5, mm1 ; transpose coefficients(phase 2)
punpcklwd mm1, mm2 ; mm1=(04 05 06 07 14 15 16 17)
punpckhwd mm5, mm2 ; mm5=(24 25 26 27 34 35 36 37)
movq mm3, mm0 ; transpose coefficients(phase 3)
punpckldq mm0, mm1 ; mm0=(00 01 02 03 04 05 06 07)
punpckhdq mm3, mm1 ; mm3=(10 11 12 13 14 15 16 17)
movq mm4, mm7 ; transpose coefficients(phase 3)
punpckldq mm7, mm5 ; mm7=(20 21 22 23 24 25 26 27)
punpckhdq mm4, mm5 ; mm4=(30 31 32 33 34 35 36 37)
pushpic ebx ; save GOT address
mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
mov ebx, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm0
movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm3
mov edx, JSAMPROW [edi+2*SIZEOF_JSAMPROW]
mov ebx, JSAMPROW [edi+3*SIZEOF_JSAMPROW]
movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm7
movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm4
poppic ebx ; restore GOT address
add esi, byte 4*SIZEOF_JCOEF ; wsptr
add edi, byte 4*SIZEOF_JSAMPROW
dec ecx ; ctr
jnz near .rowloop
emms ; empty MMX state
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
pop 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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