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5e27ca23
Author :
Date :
2025-09-19T14:21:49
x86: Reformat NASM code to improve readability (and simplify the checkstyle script)
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;
; Reduced-size IDCT (32-bit SSE2)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright (C) 2016, 2024-2025, 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) or Yasm.
;
; This file contains inverse DCT routines that produce reduced-size output:
; either 4x4 or 2x2 pixels from an 8x8 DCT block. The following code is based
; directly on the IJG's original jidctred.c; see jidctred.c for more details.
%include "jsimdext.inc"
%include "jdct.inc"
; --------------------------------------------------------------------------
%define CONST_BITS 13
%define PASS1_BITS 2
%define DESCALE_P1_4 (CONST_BITS - PASS1_BITS + 1)
%define DESCALE_P2_4 (CONST_BITS + PASS1_BITS + 3 + 1)
%define DESCALE_P1_2 (CONST_BITS - PASS1_BITS + 2)
%define DESCALE_P2_2 (CONST_BITS + PASS1_BITS + 3 + 2)
%if CONST_BITS == 13
F_0_211 equ 1730 ; FIX(0.211164243)
F_0_509 equ 4176 ; FIX(0.509795579)
F_0_601 equ 4926 ; FIX(0.601344887)
F_0_720 equ 5906 ; FIX(0.720959822)
F_0_765 equ 6270 ; FIX(0.765366865)
F_0_850 equ 6967 ; FIX(0.850430095)
F_0_899 equ 7373 ; FIX(0.899976223)
F_1_061 equ 8697 ; FIX(1.061594337)
F_1_272 equ 10426 ; FIX(1.272758580)
F_1_451 equ 11893 ; FIX(1.451774981)
F_1_847 equ 15137 ; FIX(1.847759065)
F_2_172 equ 17799 ; FIX(2.172734803)
F_2_562 equ 20995 ; FIX(2.562915447)
F_3_624 equ 29692 ; FIX(3.624509785)
%else
; NASM cannot do compile-time arithmetic on floating-point constants.
%define DESCALE(x, n) (((x) + (1 << ((n) - 1))) >> (n))
F_0_211 equ DESCALE( 226735879, 30 - CONST_BITS) ; FIX(0.211164243)
F_0_509 equ DESCALE( 547388834, 30 - CONST_BITS) ; FIX(0.509795579)
F_0_601 equ DESCALE( 645689155, 30 - CONST_BITS) ; FIX(0.601344887)
F_0_720 equ DESCALE( 774124714, 30 - CONST_BITS) ; FIX(0.720959822)
F_0_765 equ DESCALE( 821806413, 30 - CONST_BITS) ; FIX(0.765366865)
F_0_850 equ DESCALE( 913142361, 30 - CONST_BITS) ; FIX(0.850430095)
F_0_899 equ DESCALE( 966342111, 30 - CONST_BITS) ; FIX(0.899976223)
F_1_061 equ DESCALE(1139878239, 30 - CONST_BITS) ; FIX(1.061594337)
F_1_272 equ DESCALE(1366614119, 30 - CONST_BITS) ; FIX(1.272758580)
F_1_451 equ DESCALE(1558831516, 30 - CONST_BITS) ; FIX(1.451774981)
F_1_847 equ DESCALE(1984016188, 30 - CONST_BITS) ; FIX(1.847759065)
F_2_172 equ DESCALE(2332956230, 30 - CONST_BITS) ; FIX(2.172734803)
F_2_562 equ DESCALE(2751909506, 30 - CONST_BITS) ; FIX(2.562915447)
F_3_624 equ DESCALE(3891787747, 30 - CONST_BITS) ; FIX(3.624509785)
%endif
; --------------------------------------------------------------------------
SECTION SEG_CONST
ALIGNZ 32
GLOBAL_DATA(jconst_idct_red_sse2)
EXTN(jconst_idct_red_sse2):
PW_F184_MF076 times 4 dw F_1_847, -F_0_765
PW_F256_F089 times 4 dw F_2_562, F_0_899
PW_F106_MF217 times 4 dw F_1_061, -F_2_172
PW_MF060_MF050 times 4 dw -F_0_601, -F_0_509
PW_F145_MF021 times 4 dw F_1_451, -F_0_211
PW_F362_MF127 times 4 dw F_3_624, -F_1_272
PW_F085_MF072 times 4 dw F_0_850, -F_0_720
PD_DESCALE_P1_4 times 4 dd 1 << (DESCALE_P1_4 - 1)
PD_DESCALE_P2_4 times 4 dd 1 << (DESCALE_P2_4 - 1)
PD_DESCALE_P1_2 times 4 dd 1 << (DESCALE_P1_2 - 1)
PD_DESCALE_P2_2 times 4 dd 1 << (DESCALE_P2_2 - 1)
PB_CENTERJSAMP times 16 db CENTERJSAMPLE
ALIGNZ 32
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
; Perform dequantization and inverse DCT on one block of coefficients,
; producing a reduced-size 4x4 output block.
;
; GLOBAL(void)
; jsimd_idct_4x4_sse2(void *dct_table, JCOEFPTR coef_block,
; JSAMPARRAY output_buf, JDIMENSION output_col)
%define dct_table(b) (b) + 8 ; void *dct_table
%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_XMMWORD
; xmmword wk[WK_NUM]
%define WK_NUM 2
align 32
GLOBAL_FUNCTION(jsimd_idct_4x4_sse2)
EXTN(jsimd_idct_4x4_sse2):
push ebp
mov eax, esp ; eax = original ebp
sub esp, byte 4
and esp, byte (-SIZEOF_XMMWORD) ; align to 128 bits
mov [esp], eax
mov ebp, esp ; ebp = aligned ebp
lea esp, [wk(0)]
PUSHPIC ebx
; push ecx ; unused
; push edx ; need not be preserved
push esi
push edi
GET_GOT ebx ; get GOT address
; ---- Pass 1: process columns from input.
; mov eax, [original_ebp]
mov edx, POINTER [dct_table(eax)] ; quantptr
mov esi, JCOEFPTR [coef_block(eax)] ; inptr
%ifndef NO_ZERO_COLUMN_TEST_4X4_SSE2
mov eax, dword [DWBLOCK(1, 0, esi, SIZEOF_JCOEF)]
or eax, dword [DWBLOCK(2, 0, esi, SIZEOF_JCOEF)]
jnz short .columnDCT
movdqa xmm0, XMMWORD [XMMBLOCK(1, 0, esi, SIZEOF_JCOEF)]
movdqa xmm1, XMMWORD [XMMBLOCK(2, 0, esi, SIZEOF_JCOEF)]
por xmm0, XMMWORD [XMMBLOCK(3, 0, esi, SIZEOF_JCOEF)]
por xmm1, XMMWORD [XMMBLOCK(5, 0, esi, SIZEOF_JCOEF)]
por xmm0, XMMWORD [XMMBLOCK(6, 0, esi, SIZEOF_JCOEF)]
por xmm1, XMMWORD [XMMBLOCK(7, 0, esi, SIZEOF_JCOEF)]
por xmm0, xmm1
packsswb xmm0, xmm0
packsswb xmm0, xmm0
movd eax, xmm0
test eax, eax
jnz short .columnDCT
; -- AC terms all zero
movdqa xmm0, XMMWORD [XMMBLOCK(0, 0, esi, SIZEOF_JCOEF)]
pmullw xmm0, XMMWORD [XMMBLOCK(0, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
psllw xmm0, PASS1_BITS
movdqa xmm3, xmm0 ; xmm0 = in0 = (00 01 02 03 04 05 06 07)
punpcklwd xmm0, xmm0 ; xmm0 = (00 00 01 01 02 02 03 03)
punpckhwd xmm3, xmm3 ; xmm3 = (04 04 05 05 06 06 07 07)
pshufd xmm1, xmm0, 0x50
; xmm1 = [col0 col1] = (00 00 00 00 01 01 01 01)
pshufd xmm0, xmm0, 0xFA
; xmm0 = [col2 col3] = (02 02 02 02 03 03 03 03)
pshufd xmm6, xmm3, 0x50
; xmm6 = [col4 col5] = (04 04 04 04 05 05 05 05)
pshufd xmm3, xmm3, 0xFA
; xmm3 = [col6 col7] = (06 06 06 06 07 07 07 07)
jmp near .column_end
ALIGNX 16, 7
%endif
.columnDCT:
; -- Odd part
movdqa xmm0, XMMWORD [XMMBLOCK(1, 0, esi, SIZEOF_JCOEF)]
movdqa xmm1, XMMWORD [XMMBLOCK(3, 0, esi, SIZEOF_JCOEF)]
pmullw xmm0, XMMWORD [XMMBLOCK(1, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
pmullw xmm1, XMMWORD [XMMBLOCK(3, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
movdqa xmm2, XMMWORD [XMMBLOCK(5, 0, esi, SIZEOF_JCOEF)]
movdqa xmm3, XMMWORD [XMMBLOCK(7, 0, esi, SIZEOF_JCOEF)]
pmullw xmm2, XMMWORD [XMMBLOCK(5, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
pmullw xmm3, XMMWORD [XMMBLOCK(7, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
movdqa xmm4, xmm0
movdqa xmm5, xmm0
punpcklwd xmm4, xmm1
punpckhwd xmm5, xmm1
movdqa xmm0, xmm4
movdqa xmm1, xmm5
pmaddwd xmm4, [GOTOFF(ebx, PW_F256_F089)] ; xmm4 = (tmp2L)
pmaddwd xmm5, [GOTOFF(ebx, PW_F256_F089)] ; xmm5 = (tmp2H)
pmaddwd xmm0, [GOTOFF(ebx, PW_F106_MF217)] ; xmm0 = (tmp0L)
pmaddwd xmm1, [GOTOFF(ebx, PW_F106_MF217)] ; xmm1 = (tmp0H)
movdqa xmm6, xmm2
movdqa xmm7, xmm2
punpcklwd xmm6, xmm3
punpckhwd xmm7, xmm3
movdqa xmm2, xmm6
movdqa xmm3, xmm7
pmaddwd xmm6, [GOTOFF(ebx, PW_MF060_MF050)] ; xmm6 = (tmp2L)
pmaddwd xmm7, [GOTOFF(ebx, PW_MF060_MF050)] ; xmm7 = (tmp2H)
pmaddwd xmm2, [GOTOFF(ebx, PW_F145_MF021)] ; xmm2 = (tmp0L)
pmaddwd xmm3, [GOTOFF(ebx, PW_F145_MF021)] ; xmm3 = (tmp0H)
paddd xmm6, xmm4 ; xmm6 = tmp2L
paddd xmm7, xmm5 ; xmm7 = tmp2H
paddd xmm2, xmm0 ; xmm2 = tmp0L
paddd xmm3, xmm1 ; xmm3 = tmp0H
movdqa XMMWORD [wk(0)], xmm2 ; wk(0) = tmp0L
movdqa XMMWORD [wk(1)], xmm3 ; wk(1) = tmp0H
; -- Even part
movdqa xmm4, XMMWORD [XMMBLOCK(0, 0, esi, SIZEOF_JCOEF)]
movdqa xmm5, XMMWORD [XMMBLOCK(2, 0, esi, SIZEOF_JCOEF)]
movdqa xmm0, XMMWORD [XMMBLOCK(6, 0, esi, SIZEOF_JCOEF)]
pmullw xmm4, XMMWORD [XMMBLOCK(0, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
pmullw xmm5, XMMWORD [XMMBLOCK(2, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
pmullw xmm0, XMMWORD [XMMBLOCK(6, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
pxor xmm1, xmm1
pxor xmm2, xmm2
punpcklwd xmm1, xmm4 ; xmm1 = tmp0L
punpckhwd xmm2, xmm4 ; xmm2 = tmp0H
psrad xmm1, (16 - CONST_BITS - 1)
; psrad xmm1, 16 & pslld xmm1, CONST_BITS + 1
psrad xmm2, (16 - CONST_BITS - 1)
; psrad xmm2, 16 & pslld xmm2, CONST_BITS + 1
movdqa xmm3, xmm5 ; xmm5 = in2 = z2
punpcklwd xmm5, xmm0 ; xmm0 = in6 = z3
punpckhwd xmm3, xmm0
pmaddwd xmm5, [GOTOFF(ebx, PW_F184_MF076)] ; xmm5 = tmp2L
pmaddwd xmm3, [GOTOFF(ebx, PW_F184_MF076)] ; xmm3 = tmp2H
movdqa xmm4, xmm1
movdqa xmm0, xmm2
paddd xmm1, xmm5 ; xmm1 = tmp10L
paddd xmm2, xmm3 ; xmm2 = tmp10H
psubd xmm4, xmm5 ; xmm4 = tmp12L
psubd xmm0, xmm3 ; xmm0 = tmp12H
; -- Final output stage
movdqa xmm5, xmm1
movdqa xmm3, xmm2
paddd xmm1, xmm6 ; xmm1 = data0L
paddd xmm2, xmm7 ; xmm2 = data0H
psubd xmm5, xmm6 ; xmm5 = data3L
psubd xmm3, xmm7 ; xmm3 = data3H
movdqa xmm6, [GOTOFF(ebx, PD_DESCALE_P1_4)]
; xmm6 = [PD_DESCALE_P1_4]
paddd xmm1, xmm6
paddd xmm2, xmm6
psrad xmm1, DESCALE_P1_4
psrad xmm2, DESCALE_P1_4
paddd xmm5, xmm6
paddd xmm3, xmm6
psrad xmm5, DESCALE_P1_4
psrad xmm3, DESCALE_P1_4
packssdw xmm1, xmm2 ; xmm1 = data0 = (00 01 02 03 04 05 06 07)
packssdw xmm5, xmm3 ; xmm5 = data3 = (30 31 32 33 34 35 36 37)
movdqa xmm7, XMMWORD [wk(0)] ; xmm7 = tmp0L
movdqa xmm6, XMMWORD [wk(1)] ; xmm6 = tmp0H
movdqa xmm2, xmm4
movdqa xmm3, xmm0
paddd xmm4, xmm7 ; xmm4 = data1L
paddd xmm0, xmm6 ; xmm0 = data1H
psubd xmm2, xmm7 ; xmm2 = data2L
psubd xmm3, xmm6 ; xmm3 = data2H
movdqa xmm7, [GOTOFF(ebx, PD_DESCALE_P1_4)]
; xmm7 = [PD_DESCALE_P1_4]
paddd xmm4, xmm7
paddd xmm0, xmm7
psrad xmm4, DESCALE_P1_4
psrad xmm0, DESCALE_P1_4
paddd xmm2, xmm7
paddd xmm3, xmm7
psrad xmm2, DESCALE_P1_4
psrad xmm3, DESCALE_P1_4
packssdw xmm4, xmm0 ; xmm4 = data1 = (10 11 12 13 14 15 16 17)
packssdw xmm2, xmm3 ; xmm2 = data2 = (20 21 22 23 24 25 26 27)
movdqa xmm6, xmm1 ; transpose coefficients(phase 1)
punpcklwd xmm1, xmm4 ; xmm1 = (00 10 01 11 02 12 03 13)
punpckhwd xmm6, xmm4 ; xmm6 = (04 14 05 15 06 16 07 17)
movdqa xmm7, xmm2 ; transpose coefficients(phase 1)
punpcklwd xmm2, xmm5 ; xmm2 = (20 30 21 31 22 32 23 33)
punpckhwd xmm7, xmm5 ; xmm7 = (24 34 25 35 26 36 27 37)
movdqa xmm0, xmm1 ; transpose coefficients(phase 2)
punpckldq xmm1, xmm2 ; xmm1 = [col0 col1] = (00 10 20 30 01 11 21 31)
punpckhdq xmm0, xmm2 ; xmm0 = [col2 col3] = (02 12 22 32 03 13 23 33)
movdqa xmm3, xmm6 ; transpose coefficients(phase 2)
punpckldq xmm6, xmm7 ; xmm6 = [col4 col5] = (04 14 24 34 05 15 25 35)
punpckhdq xmm3, xmm7 ; xmm3 = [col6 col7] = (06 16 26 36 07 17 27 37)
.column_end:
; -- Prefetch the next coefficient block
prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 0 * 32]
prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 1 * 32]
prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 2 * 32]
prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 3 * 32]
; ---- Pass 2: process rows, store into output array.
mov eax, [original_ebp]
mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *)
mov eax, JDIMENSION [output_col(eax)]
; -- Even part
pxor xmm4, xmm4
punpcklwd xmm4, xmm1 ; xmm4 = tmp0
psrad xmm4, (16 - CONST_BITS - 1)
; psrad xmm4, 16 & pslld xmm4, CONST_BITS + 1
; -- Odd part
punpckhwd xmm1, xmm0
punpckhwd xmm6, xmm3
movdqa xmm5, xmm1
movdqa xmm2, xmm6
pmaddwd xmm1, [GOTOFF(ebx, PW_F256_F089)] ; xmm1 = (tmp2)
pmaddwd xmm6, [GOTOFF(ebx, PW_MF060_MF050)] ; xmm6 = (tmp2)
pmaddwd xmm5, [GOTOFF(ebx, PW_F106_MF217)] ; xmm5 = (tmp0)
pmaddwd xmm2, [GOTOFF(ebx, PW_F145_MF021)] ; xmm2 = (tmp0)
paddd xmm6, xmm1 ; xmm6 = tmp2
paddd xmm2, xmm5 ; xmm2 = tmp0
; -- Even part
punpcklwd xmm0, xmm3
pmaddwd xmm0, [GOTOFF(ebx, PW_F184_MF076)] ; xmm0 = tmp2
movdqa xmm7, xmm4
paddd xmm4, xmm0 ; xmm4 = tmp10
psubd xmm7, xmm0 ; xmm7 = tmp12
; -- Final output stage
movdqa xmm1, [GOTOFF(ebx, PD_DESCALE_P2_4)]
; xmm1 = [PD_DESCALE_P2_4]
movdqa xmm5, xmm4
movdqa xmm3, xmm7
paddd xmm4, xmm6 ; xmm4 = data0 = (00 10 20 30)
paddd xmm7, xmm2 ; xmm7 = data1 = (01 11 21 31)
psubd xmm5, xmm6 ; xmm5 = data3 = (03 13 23 33)
psubd xmm3, xmm2 ; xmm3 = data2 = (02 12 22 32)
paddd xmm4, xmm1
paddd xmm7, xmm1
psrad xmm4, DESCALE_P2_4
psrad xmm7, DESCALE_P2_4
paddd xmm5, xmm1
paddd xmm3, xmm1
psrad xmm5, DESCALE_P2_4
psrad xmm3, DESCALE_P2_4
packssdw xmm4, xmm3 ; xmm4 = (00 10 20 30 02 12 22 32)
packssdw xmm7, xmm5 ; xmm7 = (01 11 21 31 03 13 23 33)
movdqa xmm0, xmm4 ; transpose coefficients(phase 1)
punpcklwd xmm4, xmm7 ; xmm4 = (00 01 10 11 20 21 30 31)
punpckhwd xmm0, xmm7 ; xmm0 = (02 03 12 13 22 23 32 33)
movdqa xmm6, xmm4 ; transpose coefficients(phase 2)
punpckldq xmm4, xmm0 ; xmm4 = (00 01 02 03 10 11 12 13)
punpckhdq xmm6, xmm0 ; xmm6 = (20 21 22 23 30 31 32 33)
packsswb xmm4, xmm6 ; xmm4 = (00 01 02 03 10 11 12 13 20 ..)
paddb xmm4, [GOTOFF(ebx, PB_CENTERJSAMP)]
pshufd xmm2, xmm4, 0x39 ; xmm2 = (10 11 12 13 20 21 22 23 30 ..)
pshufd xmm1, xmm4, 0x4E ; xmm1 = (20 21 22 23 30 31 32 33 00 ..)
pshufd xmm3, xmm4, 0x93 ; xmm3 = (30 31 32 33 00 01 02 03 10 ..)
mov edx, JSAMPROW [edi + 0 * SIZEOF_JSAMPROW]
mov esi, JSAMPROW [edi + 1 * SIZEOF_JSAMPROW]
movd XMM_DWORD [edx + eax * SIZEOF_JSAMPLE], xmm4
movd XMM_DWORD [esi + eax * SIZEOF_JSAMPLE], xmm2
mov edx, JSAMPROW [edi + 2 * SIZEOF_JSAMPROW]
mov esi, JSAMPROW [edi + 3 * SIZEOF_JSAMPROW]
movd XMM_DWORD [edx + eax * SIZEOF_JSAMPLE], xmm1
movd XMM_DWORD [esi + eax * SIZEOF_JSAMPLE], xmm3
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; unused
POPPIC ebx
mov esp, ebp ; esp <- aligned ebp
pop esp ; esp <- original ebp
pop ebp
ret
; --------------------------------------------------------------------------
;
; Perform dequantization and inverse DCT on one block of coefficients,
; producing a reduced-size 2x2 output block.
;
; GLOBAL(void)
; jsimd_idct_2x2_sse2(void *dct_table, JCOEFPTR coef_block,
; JSAMPARRAY output_buf, JDIMENSION output_col)
%define dct_table(b) (b) + 8 ; void *dct_table
%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
align 32
GLOBAL_FUNCTION(jsimd_idct_2x2_sse2)
EXTN(jsimd_idct_2x2_sse2):
push ebp
mov ebp, esp
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.
mov edx, POINTER [dct_table(ebp)] ; quantptr
mov esi, JCOEFPTR [coef_block(ebp)] ; inptr
; | input: | result: |
; | 00 01 ** 03 ** 05 ** 07 | |
; | 10 11 ** 13 ** 15 ** 17 | |
; | ** ** ** ** ** ** ** ** | |
; | 30 31 ** 33 ** 35 ** 37 | A0 A1 A3 A5 A7 |
; | ** ** ** ** ** ** ** ** | B0 B1 B3 B5 B7 |
; | 50 51 ** 53 ** 55 ** 57 | |
; | ** ** ** ** ** ** ** ** | |
; | 70 71 ** 73 ** 75 ** 77 | |
; -- Odd part
movdqa xmm0, XMMWORD [XMMBLOCK(1, 0, esi, SIZEOF_JCOEF)]
movdqa xmm1, XMMWORD [XMMBLOCK(3, 0, esi, SIZEOF_JCOEF)]
pmullw xmm0, XMMWORD [XMMBLOCK(1, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
pmullw xmm1, XMMWORD [XMMBLOCK(3, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
movdqa xmm2, XMMWORD [XMMBLOCK(5, 0, esi, SIZEOF_JCOEF)]
movdqa xmm3, XMMWORD [XMMBLOCK(7, 0, esi, SIZEOF_JCOEF)]
pmullw xmm2, XMMWORD [XMMBLOCK(5, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
pmullw xmm3, XMMWORD [XMMBLOCK(7, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
; xmm0 = (10 11 ** 13 ** 15 ** 17)
; xmm1 = (30 31 ** 33 ** 35 ** 37)
; xmm2 = (50 51 ** 53 ** 55 ** 57)
; xmm3 = (70 71 ** 73 ** 75 ** 77)
pcmpeqd xmm7, xmm7
pslld xmm7, WORD_BIT ; xmm7 = { 0x0000 0xFFFF 0x0000 0xFFFF .. }
movdqa xmm4, xmm0 ; xmm4 = (10 11 ** 13 ** 15 ** 17)
movdqa xmm5, xmm2 ; xmm5 = (50 51 ** 53 ** 55 ** 57)
punpcklwd xmm4, xmm1 ; xmm4 = (10 30 11 31 ** ** 13 33)
punpcklwd xmm5, xmm3 ; xmm5 = (50 70 51 71 ** ** 53 73)
pmaddwd xmm4, [GOTOFF(ebx, PW_F362_MF127)]
pmaddwd xmm5, [GOTOFF(ebx, PW_F085_MF072)]
psrld xmm0, WORD_BIT ; xmm0 = (11 -- 13 -- 15 -- 17 --)
pand xmm1, xmm7 ; xmm1 = (-- 31 -- 33 -- 35 -- 37)
psrld xmm2, WORD_BIT ; xmm2 = (51 -- 53 -- 55 -- 57 --)
pand xmm3, xmm7 ; xmm3 = (-- 71 -- 73 -- 75 -- 77)
por xmm0, xmm1 ; xmm0 = (11 31 13 33 15 35 17 37)
por xmm2, xmm3 ; xmm2 = (51 71 53 73 55 75 57 77)
pmaddwd xmm0, [GOTOFF(ebx, PW_F362_MF127)]
pmaddwd xmm2, [GOTOFF(ebx, PW_F085_MF072)]
paddd xmm4, xmm5 ; xmm4 = tmp0[col0 col1 **** col3]
paddd xmm0, xmm2 ; xmm0 = tmp0[col1 col3 col5 col7]
; -- Even part
movdqa xmm6, XMMWORD [XMMBLOCK(0, 0, esi, SIZEOF_JCOEF)]
pmullw xmm6, XMMWORD [XMMBLOCK(0, 0, edx, SIZEOF_ISLOW_MULT_TYPE)]
; xmm6 = (00 01 ** 03 ** 05 ** 07)
movdqa xmm1, xmm6 ; xmm1 = (00 01 ** 03 ** 05 ** 07)
pslld xmm6, WORD_BIT ; xmm6 = (-- 00 -- ** -- ** -- **)
pand xmm1, xmm7 ; xmm1 = (-- 01 -- 03 -- 05 -- 07)
psrad xmm6, (WORD_BIT - CONST_BITS - 2)
; xmm6 = tmp10[col0 **** **** ****]
psrad xmm1, (WORD_BIT - CONST_BITS - 2)
; xmm1 = tmp10[col1 col3 col5 col7]
; -- Final output stage
movdqa xmm3, xmm6
movdqa xmm5, xmm1
paddd xmm6, xmm4 ; xmm6 = data0[col0 **** **** ****] = (A0 ** ** **)
paddd xmm1, xmm0 ; xmm1 = data0[col1 col3 col5 col7] = (A1 A3 A5 A7)
psubd xmm3, xmm4 ; xmm3 = data1[col0 **** **** ****] = (B0 ** ** **)
psubd xmm5, xmm0 ; xmm5 = data1[col1 col3 col5 col7] = (B1 B3 B5 B7)
movdqa xmm2, [GOTOFF(ebx, PD_DESCALE_P1_2)]
; xmm2 = [PD_DESCALE_P1_2]
punpckldq xmm6, xmm3 ; xmm6 = (A0 B0 ** **)
movdqa xmm7, xmm1
punpcklqdq xmm1, xmm5 ; xmm1 = (A1 A3 B1 B3)
punpckhqdq xmm7, xmm5 ; xmm7 = (A5 A7 B5 B7)
paddd xmm6, xmm2
psrad xmm6, DESCALE_P1_2
paddd xmm1, xmm2
paddd xmm7, xmm2
psrad xmm1, DESCALE_P1_2
psrad xmm7, DESCALE_P1_2
; -- Prefetch the next coefficient block
prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 0 * 32]
prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 1 * 32]
prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 2 * 32]
prefetchnta [esi + DCTSIZE2 * SIZEOF_JCOEF + 3 * 32]
; ---- Pass 2: process rows, store into output array.
mov edi, JSAMPARRAY [output_buf(ebp)] ; (JSAMPROW *)
mov eax, JDIMENSION [output_col(ebp)]
; | input:| result:|
; | A0 B0 | |
; | A1 B1 | C0 C1 |
; | A3 B3 | D0 D1 |
; | A5 B5 | |
; | A7 B7 | |
; -- Odd part
packssdw xmm1, xmm1 ; xmm1 = (A1 A3 B1 B3 A1 A3 B1 B3)
packssdw xmm7, xmm7 ; xmm7 = (A5 A7 B5 B7 A5 A7 B5 B7)
pmaddwd xmm1, [GOTOFF(ebx, PW_F362_MF127)]
pmaddwd xmm7, [GOTOFF(ebx, PW_F085_MF072)]
paddd xmm1, xmm7 ; xmm1 = tmp0[row0 row1 row0 row1]
; -- Even part
pslld xmm6, (CONST_BITS + 2) ; xmm6 = tmp10[row0 row1 **** ****]
; -- Final output stage
movdqa xmm4, xmm6
paddd xmm6, xmm1 ; xmm6 = data0[row0 row1 **** ****] = (C0 C1 ** **)
psubd xmm4, xmm1 ; xmm4 = data1[row0 row1 **** ****] = (D0 D1 ** **)
punpckldq xmm6, xmm4 ; xmm6 = (C0 D0 C1 D1)
paddd xmm6, [GOTOFF(ebx, PD_DESCALE_P2_2)]
psrad xmm6, DESCALE_P2_2
packssdw xmm6, xmm6 ; xmm6 = (C0 D0 C1 D1 C0 D0 C1 D1)
packsswb xmm6, xmm6 ; xmm6 = (C0 D0 C1 D1 C0 D0 C1 D1 ..)
paddb xmm6, [GOTOFF(ebx, PB_CENTERJSAMP)]
pextrw ebx, xmm6, 0x00 ; ebx = (C0 D0 -- --)
pextrw ecx, xmm6, 0x01 ; ecx = (C1 D1 -- --)
mov edx, JSAMPROW [edi + 0 * SIZEOF_JSAMPROW]
mov esi, JSAMPROW [edi + 1 * SIZEOF_JSAMPROW]
mov word [edx + eax * SIZEOF_JSAMPLE], bx
mov word [esi + eax * SIZEOF_JSAMPLE], cx
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
pop ebx
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