;
; jidctflt.asm - floating-point IDCT (3DNow! & MMX)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
;
; 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 floating-point implementation of the inverse DCT
; (Discrete Cosine Transform). The following code is based directly on
; the IJG's original jidctflt.c; see the jidctflt.c for more details.
;
; [TAB8]
%include "jsimdext.inc"
%include "jdct.inc"
; --------------------------------------------------------------------------
SECTION SEG_CONST
alignz 16
global EXTN(jconst_idct_float_3dnow)
EXTN(jconst_idct_float_3dnow):
PD_1_414 times 2 dd 1.414213562373095048801689
PD_1_847 times 2 dd 1.847759065022573512256366
PD_1_082 times 2 dd 1.082392200292393968799446
PD_2_613 times 2 dd 2.613125929752753055713286
PD_RNDINT_MAGIC times 2 dd 100663296.0 ; (float)(0x00C00000 << 3)
PB_CENTERJSAMP times 8 db CENTERJSAMPLE
alignz 16
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
;
; Perform dequantization and inverse DCT on one block of coefficients.
;
; GLOBAL(void)
; jsimd_idct_float_3dnow (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_MMWORD ; mmword wk[WK_NUM]
%define WK_NUM 2
%define workspace wk(0)-DCTSIZE2*SIZEOF_FAST_FLOAT
; FAST_FLOAT workspace[DCTSIZE2]
align 16
global EXTN(jsimd_idct_float_3dnow)
EXTN(jsimd_idct_float_3dnow):
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] ; FAST_FLOAT *wsptr
mov ecx, DCTSIZE/2 ; ctr
alignx 16,7
.columnloop:
%ifndef NO_ZERO_COLUMN_TEST_FLOAT_3DNOW
mov eax, DWORD [DWBLOCK(1,0,esi,SIZEOF_JCOEF)]
or eax, DWORD [DWBLOCK(2,0,esi,SIZEOF_JCOEF)]
jnz short .columnDCT
pushpic ebx ; save GOT address
mov ebx, DWORD [DWBLOCK(3,0,esi,SIZEOF_JCOEF)]
mov eax, DWORD [DWBLOCK(4,0,esi,SIZEOF_JCOEF)]
or ebx, DWORD [DWBLOCK(5,0,esi,SIZEOF_JCOEF)]
or eax, DWORD [DWBLOCK(6,0,esi,SIZEOF_JCOEF)]
or ebx, DWORD [DWBLOCK(7,0,esi,SIZEOF_JCOEF)]
or eax,ebx
poppic ebx ; restore GOT address
jnz short .columnDCT
; -- AC terms all zero
movd mm0, DWORD [DWBLOCK(0,0,esi,SIZEOF_JCOEF)]
punpcklwd mm0,mm0
psrad mm0,(DWORD_BIT-WORD_BIT)
pi2fd mm0,mm0
pfmul mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_FLOAT_MULT_TYPE)]
movq mm1,mm0
punpckldq mm0,mm0
punpckhdq mm1,mm1
movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_FAST_FLOAT)], mm0
movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_FAST_FLOAT)], mm0
movq MMWORD [MMBLOCK(0,2,edi,SIZEOF_FAST_FLOAT)], mm0
movq MMWORD [MMBLOCK(0,3,edi,SIZEOF_FAST_FLOAT)], mm0
movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_FAST_FLOAT)], mm1
movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_FAST_FLOAT)], mm1
movq MMWORD [MMBLOCK(1,2,edi,SIZEOF_FAST_FLOAT)], mm1
movq MMWORD [MMBLOCK(1,3,edi,SIZEOF_FAST_FLOAT)], mm1
jmp near .nextcolumn
alignx 16,7
%endif
.columnDCT:
; -- Even part
movd mm0, DWORD [DWBLOCK(0,0,esi,SIZEOF_JCOEF)]
movd mm1, DWORD [DWBLOCK(2,0,esi,SIZEOF_JCOEF)]
movd mm2, DWORD [DWBLOCK(4,0,esi,SIZEOF_JCOEF)]
movd mm3, DWORD [DWBLOCK(6,0,esi,SIZEOF_JCOEF)]
punpcklwd mm0,mm0
punpcklwd mm1,mm1
psrad mm0,(DWORD_BIT-WORD_BIT)
psrad mm1,(DWORD_BIT-WORD_BIT)
pi2fd mm0,mm0
pi2fd mm1,mm1
pfmul mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_FLOAT_MULT_TYPE)]
pfmul mm1, MMWORD [MMBLOCK(2,0,edx,SIZEOF_FLOAT_MULT_TYPE)]
punpcklwd mm2,mm2
punpcklwd mm3,mm3
psrad mm2,(DWORD_BIT-WORD_BIT)
psrad mm3,(DWORD_BIT-WORD_BIT)
pi2fd mm2,mm2
pi2fd mm3,mm3
pfmul mm2, MMWORD [MMBLOCK(4,0,edx,SIZEOF_FLOAT_MULT_TYPE)]
pfmul mm3, MMWORD [MMBLOCK(6,0,edx,SIZEOF_FLOAT_MULT_TYPE)]
movq mm4,mm0
movq mm5,mm1
pfsub mm0,mm2 ; mm0=tmp11
pfsub mm1,mm3
pfadd mm4,mm2 ; mm4=tmp10
pfadd mm5,mm3 ; mm5=tmp13
pfmul mm1,[GOTOFF(ebx,PD_1_414)]
pfsub mm1,mm5 ; mm1=tmp12
movq mm6,mm4
movq mm7,mm0
pfsub mm4,mm5 ; mm4=tmp3
pfsub mm0,mm1 ; mm0=tmp2
pfadd mm6,mm5 ; mm6=tmp0
pfadd mm7,mm1 ; mm7=tmp1
movq MMWORD [wk(1)], mm4 ; tmp3
movq MMWORD [wk(0)], mm0 ; tmp2
; -- Odd part
movd mm2, DWORD [DWBLOCK(1,0,esi,SIZEOF_JCOEF)]
movd mm3, DWORD [DWBLOCK(3,0,esi,SIZEOF_JCOEF)]
movd mm5, DWORD [DWBLOCK(5,0,esi,SIZEOF_JCOEF)]
movd mm1, DWORD [DWBLOCK(7,0,esi,SIZEOF_JCOEF)]
punpcklwd mm2,mm2
punpcklwd mm3,mm3
psrad mm2,(DWORD_BIT-WORD_BIT)
psrad mm3,(DWORD_BIT-WORD_BIT)
pi2fd mm2,mm2
pi2fd mm3,mm3
pfmul mm2, MMWORD [MMBLOCK(1,0,edx,SIZEOF_FLOAT_MULT_TYPE)]
pfmul mm3, MMWORD [MMBLOCK(3,0,edx,SIZEOF_FLOAT_MULT_TYPE)]
punpcklwd mm5,mm5
punpcklwd mm1,mm1
psrad mm5,(DWORD_BIT-WORD_BIT)
psrad mm1,(DWORD_BIT-WORD_BIT)
pi2fd mm5,mm5
pi2fd mm1,mm1
pfmul mm5, MMWORD [MMBLOCK(5,0,edx,SIZEOF_FLOAT_MULT_TYPE)]
pfmul mm1, MMWORD [MMBLOCK(7,0,edx,SIZEOF_FLOAT_MULT_TYPE)]
movq mm4,mm2
movq mm0,mm5
pfadd mm2,mm1 ; mm2=z11
pfadd mm5,mm3 ; mm5=z13
pfsub mm4,mm1 ; mm4=z12
pfsub mm0,mm3 ; mm0=z10
movq mm1,mm2
pfsub mm2,mm5
pfadd mm1,mm5 ; mm1=tmp7
pfmul mm2,[GOTOFF(ebx,PD_1_414)] ; mm2=tmp11
movq mm3,mm0
pfadd mm0,mm4
pfmul mm0,[GOTOFF(ebx,PD_1_847)] ; mm0=z5
pfmul mm3,[GOTOFF(ebx,PD_2_613)] ; mm3=(z10 * 2.613125930)
pfmul mm4,[GOTOFF(ebx,PD_1_082)] ; mm4=(z12 * 1.082392200)
pfsubr mm3,mm0 ; mm3=tmp12
pfsub mm4,mm0 ; mm4=tmp10
; -- Final output stage
pfsub mm3,mm1 ; mm3=tmp6
movq mm5,mm6
movq mm0,mm7
pfadd mm6,mm1 ; mm6=data0=(00 01)
pfadd mm7,mm3 ; mm7=data1=(10 11)
pfsub mm5,mm1 ; mm5=data7=(70 71)
pfsub mm0,mm3 ; mm0=data6=(60 61)
pfsub mm2,mm3 ; mm2=tmp5
movq mm1,mm6 ; transpose coefficients
punpckldq mm6,mm7 ; mm6=(00 10)
punpckhdq mm1,mm7 ; mm1=(01 11)
movq mm3,mm0 ; transpose coefficients
punpckldq mm0,mm5 ; mm0=(60 70)
punpckhdq mm3,mm5 ; mm3=(61 71)
movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_FAST_FLOAT)], mm6
movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_FAST_FLOAT)], mm1
movq MMWORD [MMBLOCK(0,3,edi,SIZEOF_FAST_FLOAT)], mm0
movq MMWORD [MMBLOCK(1,3,edi,SIZEOF_FAST_FLOAT)], mm3
movq mm7, MMWORD [wk(0)] ; mm7=tmp2
movq mm5, MMWORD [wk(1)] ; mm5=tmp3
pfadd mm4,mm2 ; mm4=tmp4
movq mm6,mm7
movq mm1,mm5
pfadd mm7,mm2 ; mm7=data2=(20 21)
pfadd mm5,mm4 ; mm5=data4=(40 41)
pfsub mm6,mm2 ; mm6=data5=(50 51)
pfsub mm1,mm4 ; mm1=data3=(30 31)
movq mm0,mm7 ; transpose coefficients
punpckldq mm7,mm1 ; mm7=(20 30)
punpckhdq mm0,mm1 ; mm0=(21 31)
movq mm3,mm5 ; transpose coefficients
punpckldq mm5,mm6 ; mm5=(40 50)
punpckhdq mm3,mm6 ; mm3=(41 51)
movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_FAST_FLOAT)], mm7
movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_FAST_FLOAT)], mm0
movq MMWORD [MMBLOCK(0,2,edi,SIZEOF_FAST_FLOAT)], mm5
movq MMWORD [MMBLOCK(1,2,edi,SIZEOF_FAST_FLOAT)], mm3
.nextcolumn:
add esi, byte 2*SIZEOF_JCOEF ; coef_block
add edx, byte 2*SIZEOF_FLOAT_MULT_TYPE ; quantptr
add edi, byte 2*DCTSIZE*SIZEOF_FAST_FLOAT ; wsptr
dec ecx ; ctr
jnz near .columnloop
; -- Prefetch the next coefficient block
prefetch [esi + (DCTSIZE2-8)*SIZEOF_JCOEF + 0*32]
prefetch [esi + (DCTSIZE2-8)*SIZEOF_JCOEF + 1*32]
prefetch [esi + (DCTSIZE2-8)*SIZEOF_JCOEF + 2*32]
prefetch [esi + (DCTSIZE2-8)*SIZEOF_JCOEF + 3*32]
; ---- Pass 2: process rows from work array, store into output array.
mov eax, [original_ebp]
lea esi, [workspace] ; FAST_FLOAT *wsptr
mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *)
mov eax, JDIMENSION [output_col(eax)]
mov ecx, DCTSIZE/2 ; ctr
alignx 16,7
.rowloop:
; -- Even part
movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_FAST_FLOAT)]
movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_FAST_FLOAT)]
movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_FAST_FLOAT)]
movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_FAST_FLOAT)]
movq mm4,mm0
movq mm5,mm1
pfsub mm0,mm2 ; mm0=tmp11
pfsub mm1,mm3
pfadd mm4,mm2 ; mm4=tmp10
pfadd mm5,mm3 ; mm5=tmp13
pfmul mm1,[GOTOFF(ebx,PD_1_414)]
pfsub mm1,mm5 ; mm1=tmp12
movq mm6,mm4
movq mm7,mm0
pfsub mm4,mm5 ; mm4=tmp3
pfsub mm0,mm1 ; mm0=tmp2
pfadd mm6,mm5 ; mm6=tmp0
pfadd mm7,mm1 ; mm7=tmp1
movq MMWORD [wk(1)], mm4 ; tmp3
movq MMWORD [wk(0)], mm0 ; tmp2
; -- Odd part
movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_FAST_FLOAT)]
movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_FAST_FLOAT)]
movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_FAST_FLOAT)]
movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_FAST_FLOAT)]
movq mm4,mm2
movq mm0,mm5
pfadd mm2,mm1 ; mm2=z11
pfadd mm5,mm3 ; mm5=z13
pfsub mm4,mm1 ; mm4=z12
pfsub mm0,mm3 ; mm0=z10
movq mm1,mm2
pfsub mm2,mm5
pfadd mm1,mm5 ; mm1=tmp7
pfmul mm2,[GOTOFF(ebx,PD_1_414)] ; mm2=tmp11
movq mm3,mm0
pfadd mm0,mm4
pfmul mm0,[GOTOFF(ebx,PD_1_847)] ; mm0=z5
pfmul mm3,[GOTOFF(ebx,PD_2_613)] ; mm3=(z10 * 2.613125930)
pfmul mm4,[GOTOFF(ebx,PD_1_082)] ; mm4=(z12 * 1.082392200)
pfsubr mm3,mm0 ; mm3=tmp12
pfsub mm4,mm0 ; mm4=tmp10
; -- Final output stage
pfsub mm3,mm1 ; mm3=tmp6
movq mm5,mm6
movq mm0,mm7
pfadd mm6,mm1 ; mm6=data0=(00 10)
pfadd mm7,mm3 ; mm7=data1=(01 11)
pfsub mm5,mm1 ; mm5=data7=(07 17)
pfsub mm0,mm3 ; mm0=data6=(06 16)
pfsub mm2,mm3 ; mm2=tmp5
movq mm1,[GOTOFF(ebx,PD_RNDINT_MAGIC)] ; mm1=[PD_RNDINT_MAGIC]
pcmpeqd mm3,mm3
psrld mm3,WORD_BIT ; mm3={0xFFFF 0x0000 0xFFFF 0x0000}
pfadd mm6,mm1 ; mm6=roundint(data0/8)=(00 ** 10 **)
pfadd mm7,mm1 ; mm7=roundint(data1/8)=(01 ** 11 **)
pfadd mm0,mm1 ; mm0=roundint(data6/8)=(06 ** 16 **)
pfadd mm5,mm1 ; mm5=roundint(data7/8)=(07 ** 17 **)
pand mm6,mm3 ; mm6=(00 -- 10 --)
pslld mm7,WORD_BIT ; mm7=(-- 01 -- 11)
pand mm0,mm3 ; mm0=(06 -- 16 --)
pslld mm5,WORD_BIT ; mm5=(-- 07 -- 17)
por mm6,mm7 ; mm6=(00 01 10 11)
por mm0,mm5 ; mm0=(06 07 16 17)
movq mm1, MMWORD [wk(0)] ; mm1=tmp2
movq mm3, MMWORD [wk(1)] ; mm3=tmp3
pfadd mm4,mm2 ; mm4=tmp4
movq mm7,mm1
movq mm5,mm3
pfadd mm1,mm2 ; mm1=data2=(02 12)
pfadd mm3,mm4 ; mm3=data4=(04 14)
pfsub mm7,mm2 ; mm7=data5=(05 15)
pfsub mm5,mm4 ; mm5=data3=(03 13)
movq mm2,[GOTOFF(ebx,PD_RNDINT_MAGIC)] ; mm2=[PD_RNDINT_MAGIC]
pcmpeqd mm4,mm4
psrld mm4,WORD_BIT ; mm4={0xFFFF 0x0000 0xFFFF 0x0000}
pfadd mm3,mm2 ; mm3=roundint(data4/8)=(04 ** 14 **)
pfadd mm7,mm2 ; mm7=roundint(data5/8)=(05 ** 15 **)
pfadd mm1,mm2 ; mm1=roundint(data2/8)=(02 ** 12 **)
pfadd mm5,mm2 ; mm5=roundint(data3/8)=(03 ** 13 **)
pand mm3,mm4 ; mm3=(04 -- 14 --)
pslld mm7,WORD_BIT ; mm7=(-- 05 -- 15)
pand mm1,mm4 ; mm1=(02 -- 12 --)
pslld mm5,WORD_BIT ; mm5=(-- 03 -- 13)
por mm3,mm7 ; mm3=(04 05 14 15)
por mm1,mm5 ; mm1=(02 03 12 13)
movq mm2,[GOTOFF(ebx,PB_CENTERJSAMP)] ; mm2=[PB_CENTERJSAMP]
packsswb mm6,mm3 ; mm6=(00 01 10 11 04 05 14 15)
packsswb mm1,mm0 ; mm1=(02 03 12 13 06 07 16 17)
paddb mm6,mm2
paddb mm1,mm2
movq mm4,mm6 ; transpose coefficients(phase 2)
punpcklwd mm6,mm1 ; mm6=(00 01 02 03 10 11 12 13)
punpckhwd mm4,mm1 ; mm4=(04 05 06 07 14 15 16 17)
movq mm7,mm6 ; transpose coefficients(phase 3)
punpckldq mm6,mm4 ; mm6=(00 01 02 03 04 05 06 07)
punpckhdq mm7,mm4 ; mm7=(10 11 12 13 14 15 16 17)
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], mm6
movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm7
poppic ebx ; restore GOT address
add esi, byte 2*SIZEOF_FAST_FLOAT ; wsptr
add edi, byte 2*SIZEOF_JSAMPROW
dec ecx ; ctr
jnz near .rowloop
femms ; empty MMX/3DNow! 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 16