kc3-lang/libjpeg-turbo/jidctfst.asm

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• Hash : a2e6a9dd
  Author :
  Date : 2006-02-04T00:00:00
  

  IJG R6b with x86SIMD V1.02
  Independent JPEG Group's JPEG software release 6b
  with x86 SIMD extension for IJG JPEG library version 1.02
  

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• jidctfst.asm

• ;
  ; jidctfst.asm - fast integer IDCT (non-SIMD)
  ;
  ; 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 fast, not so accurate integer implementation of
  ; the inverse DCT (Discrete Cosine Transform). The following code is
  ; based directly on the IJG's original jidctfst.c; see the jidctfst.c
  ; for more details.
  ;
  ; Last Modified : October 17, 2004
  ;
  ; [TAB8]
  
  %include "jsimdext.inc"
  %include "jdct.inc"
  
  %ifdef DCT_IFAST_SUPPORTED
  
  ; This module is specialized to the case DCTSIZE = 8.
  ;
  %if DCTSIZE != 8
  %error "Sorry, this code only copes with 8x8 DCTs."
  %endif
  
  ; --------------------------------------------------------------------------
  
  ; We can gain a little more speed, with a further compromise in accuracy,
  ; by omitting the addition in a descaling shift.  This yields an
  ; incorrectly rounded result half the time...
  ;
  %macro	descale 2
  %ifdef USE_ACCURATE_ROUNDING
  %if (%2)<=7
  	add	%1, byte (1<<((%2)-1))	; add reg32,imm8
  %else
  	add	%1, (1<<((%2)-1))	; add reg32,imm32
  %endif
  %endif
  	sar	%1,%2
  %endmacro
  
  ; --------------------------------------------------------------------------
  
  %define CONST_BITS	8
  %define PASS1_BITS	2
  
  %if IFAST_SCALE_BITS != PASS1_BITS
  %error "'IFAST_SCALE_BITS' must be equal to 'PASS1_BITS'."
  %endif
  
  %if CONST_BITS == 8
  F_1_082	equ	277		; FIX(1.082392200)
  F_1_414	equ	362		; FIX(1.414213562)
  F_1_847	equ	473		; FIX(1.847759065)
  F_2_613	equ	669		; FIX(2.613125930)
  %else
  ; NASM cannot do compile-time arithmetic on floating-point constants.
  %define DESCALE(x,n)  (((x)+(1<<((n)-1)))>>(n))
  F_1_082	equ	DESCALE(1162209775,30-CONST_BITS)	; FIX(1.082392200)
  F_1_414	equ	DESCALE(1518500249,30-CONST_BITS)	; FIX(1.414213562)
  F_1_847	equ	DESCALE(1984016188,30-CONST_BITS)	; FIX(1.847759065)
  F_2_613	equ	DESCALE(2805822602,30-CONST_BITS)	; FIX(2.613125930)
  %endif
  
  ; --------------------------------------------------------------------------
  	SECTION	SEG_TEXT
  	BITS	32
  ;
  ; Perform dequantization and inverse DCT on one block of coefficients.
  ;
  ; GLOBAL(void)
  ; jpeg_idct_ifast (j_decompress_ptr cinfo, jpeg_component_info * compptr,
  ;                  JCOEFPTR coef_block,
  ;                  JSAMPARRAY output_buf, JDIMENSION output_col)
  ;
  
  %define cinfo(b)	(b)+8		; j_decompress_ptr cinfo
  %define compptr(b)	(b)+12		; jpeg_component_info * compptr
  %define coef_block(b)	(b)+16		; JCOEFPTR coef_block
  %define output_buf(b)	(b)+20		; JSAMPARRAY output_buf
  %define output_col(b)	(b)+24		; JDIMENSION output_col
  
  %define range_limit	ebp-SIZEOF_POINTER		; JSAMPLE * range_limit
  %define ptr		range_limit-SIZEOF_POINTER	; void * ptr
  %define workspace	ptr-DCTSIZE2*SIZEOF_INT
  					; int workspace[DCTSIZE2]
  
  	align	16
  	global	EXTN(jpeg_idct_ifast)
  
  EXTN(jpeg_idct_ifast):
  	push	ebp
  	mov	ebp,esp
  	lea	esp, [workspace]
  	push	ebx
  ;	push	ecx		; need not be preserved
  ;	push	edx		; need not be preserved
  	push	esi
  	push	edi
  
  	; ---- Pass 1: process columns from input, store into work array.
  
  	mov	edx, POINTER [compptr(ebp)]
  	mov	edx, POINTER [jcompinfo_dct_table(edx)]	; quantptr
  	mov	esi, JCOEFPTR [coef_block(ebp)]		; inptr
  	lea	edi, [workspace]			; int * wsptr
  	mov	ecx, DCTSIZE				; ctr
  	alignx	16,7
  .columnloop:
  	mov	ax, JCOEF [COL(1,esi,SIZEOF_JCOEF)]
  	or	ax, JCOEF [COL(2,esi,SIZEOF_JCOEF)]
  	jnz	short .columnDCT
  
  	mov	bx, JCOEF [COL(3,esi,SIZEOF_JCOEF)]
  	mov	ax, JCOEF [COL(4,esi,SIZEOF_JCOEF)]
  	or	bx, JCOEF [COL(5,esi,SIZEOF_JCOEF)]
  	or	ax, JCOEF [COL(6,esi,SIZEOF_JCOEF)]
  	or	bx, JCOEF [COL(7,esi,SIZEOF_JCOEF)]
  	or	ax,bx
  	jnz	short .columnDCT
  
  	; -- AC terms all zero
  
  	mov	ax, JCOEF [COL(0,esi,SIZEOF_JCOEF)]
  	imul	ax, IFAST_MULT_TYPE [COL(0,edx,SIZEOF_IFAST_MULT_TYPE)]
  	cwde
  
  	mov	INT [COL(0,edi,SIZEOF_INT)], eax
  	mov	INT [COL(1,edi,SIZEOF_INT)], eax
  	mov	INT [COL(2,edi,SIZEOF_INT)], eax
  	mov	INT [COL(3,edi,SIZEOF_INT)], eax
  	mov	INT [COL(4,edi,SIZEOF_INT)], eax
  	mov	INT [COL(5,edi,SIZEOF_INT)], eax
  	mov	INT [COL(6,edi,SIZEOF_INT)], eax
  	mov	INT [COL(7,edi,SIZEOF_INT)], eax
  	jmp	near .nextcolumn
  	alignx	16,7
  
  .columnDCT:
  	push	ecx	; ctr
  	push	esi	; coef_block
  	push	edx	; quantptr
  
  	mov	POINTER [ptr], edi	; wsptr
  
  	; -- Even part
  
  	movsx	eax, JCOEF [COL(0,esi,SIZEOF_JCOEF)]
  	movsx	ecx, JCOEF [COL(4,esi,SIZEOF_JCOEF)]
  	imul	ax, IFAST_MULT_TYPE [COL(0,edx,SIZEOF_IFAST_MULT_TYPE)]
  	imul	cx, IFAST_MULT_TYPE [COL(4,edx,SIZEOF_IFAST_MULT_TYPE)]
  	movsx	ebx, JCOEF [COL(2,esi,SIZEOF_JCOEF)]
  	movsx	edi, JCOEF [COL(6,esi,SIZEOF_JCOEF)]
  	imul	bx, IFAST_MULT_TYPE [COL(2,edx,SIZEOF_IFAST_MULT_TYPE)]
  	imul	di, IFAST_MULT_TYPE [COL(6,edx,SIZEOF_IFAST_MULT_TYPE)]
  
  	lea	edx,[eax+ecx]		; edx=tmp10
  	sub	eax,ecx			; eax=tmp11
  
  	lea	ecx,[ebx+edi]		; ecx=tmp13
  	sub	ebx,edi
  	imul	ebx,(F_1_414)
  	descale	ebx,CONST_BITS
  	sub	ebx,ecx			; ebx=tmp12
  
  	lea	edi,[edx+ecx]		; edi=tmp0
  	sub	edx,ecx			; edx=tmp3
  	lea	ecx,[eax+ebx]		; ecx=tmp1
  	sub	eax,ebx			; eax=tmp2
  
  	push	edx		; tmp3
  	push	eax		; tmp2
  	push	ecx		; tmp1
  	push	edi		; tmp0
  
  	; -- Odd part
  
  	mov	edx, POINTER [esp+16]	; quantptr
  
  	movsx	eax, JCOEF [COL(1,esi,SIZEOF_JCOEF)]
  	movsx	ebx, JCOEF [COL(7,esi,SIZEOF_JCOEF)]
  	imul	ax, IFAST_MULT_TYPE [COL(1,edx,SIZEOF_IFAST_MULT_TYPE)]
  	imul	bx, IFAST_MULT_TYPE [COL(7,edx,SIZEOF_IFAST_MULT_TYPE)]
  	movsx	edi, JCOEF [COL(5,esi,SIZEOF_JCOEF)]
  	movsx	ecx, JCOEF [COL(3,esi,SIZEOF_JCOEF)]
  	imul	di, IFAST_MULT_TYPE [COL(5,edx,SIZEOF_IFAST_MULT_TYPE)]
  	imul	cx, IFAST_MULT_TYPE [COL(3,edx,SIZEOF_IFAST_MULT_TYPE)]
  
  	lea	esi,[eax+ebx]		; esi=z11
  	sub	eax,ebx			; eax=z12
  	lea	edx,[edi+ecx]		; edx=z13
  	sub	edi,ecx			; edi=z10
  
  	lea	ebx,[esi+edx]		; ebx=tmp7
  	sub	esi,edx
  	imul	esi,(F_1_414)		; esi=tmp11
  	descale	esi,CONST_BITS
  
  	lea	ecx,[edi+eax]
  	imul	ecx,(F_1_847)		; ecx=z5
  	imul	edi,(-F_2_613)		; edi=MULTIPLY(z10,-FIX_2_613125930)
  	imul	eax,(F_1_082)		; eax=MULTIPLY(z12,FIX_1_082392200)
  	descale	ecx,CONST_BITS
  	descale	edi,CONST_BITS
  	descale	eax,CONST_BITS
  	add	edi,ecx			; edi=tmp12
  	sub	eax,ecx			; eax=tmp10
  
  	; -- Final output stage
  
  	sub	edi,ebx		; edi=tmp6
  	pop	edx		; edx=tmp0
  	sub	esi,edi		; esi=tmp5
  	pop	ecx		; ecx=tmp1
  	add	eax,esi		; eax=tmp4
  	push	esi		; tmp5
  	push	eax		; tmp4
  
  	lea	eax,[edx+ebx]	; eax=data0(=tmp0+tmp7)
  	sub	edx,ebx		; edx=data7(=tmp0-tmp7)
  	lea	ebx,[ecx+edi]	; ebx=data1(=tmp1+tmp6)
  	sub	ecx,edi		; ecx=data6(=tmp1-tmp6)
  
  	mov	edi, POINTER [ptr]	; edi=wsptr
  
  	mov	INT [COL(0,edi,SIZEOF_INT)], eax
  	mov	INT [COL(7,edi,SIZEOF_INT)], edx
  	mov	INT [COL(1,edi,SIZEOF_INT)], ebx
  	mov	INT [COL(6,edi,SIZEOF_INT)], ecx
  
  	pop	esi		; esi=tmp4
  	pop	eax		; eax=tmp5
  	pop	edx		; edx=tmp2
  	pop	ecx		; ecx=tmp3
  
  	lea	ebx,[edx+eax]	; ebx=data2(=tmp2+tmp5)
  	sub	edx,eax		; edx=data5(=tmp2-tmp5)
  	lea	eax,[ecx+esi]	; eax=data4(=tmp3+tmp4)
  	sub	ecx,esi		; ecx=data3(=tmp3-tmp4)
  
  	mov	INT [COL(2,edi,SIZEOF_INT)], ebx
  	mov	INT [COL(5,edi,SIZEOF_INT)], edx
  	mov	INT [COL(4,edi,SIZEOF_INT)], eax
  	mov	INT [COL(3,edi,SIZEOF_INT)], ecx
  
  	pop	edx	; quantptr
  	pop	esi	; coef_block
  	pop	ecx	; ctr
  
  .nextcolumn:
  	add	esi, byte SIZEOF_JCOEF	; advance pointers to next column
  	add	edx, byte SIZEOF_IFAST_MULT_TYPE
  	add	edi, byte SIZEOF_INT
  	dec	ecx
  	jnz	near .columnloop
  
  	; ---- Pass 2: process rows from work array, store into output array.
  
  	mov	eax, POINTER [cinfo(ebp)]
  	mov	eax, POINTER [jdstruct_sample_range_limit(eax)]
  	sub	eax, byte -CENTERJSAMPLE*SIZEOF_JSAMPLE	; JSAMPLE * range_limit
  	mov	POINTER [range_limit], eax
  
  	lea	esi, [workspace]			; int * wsptr
  	mov	edi, JSAMPARRAY [output_buf(ebp)]	; (JSAMPROW *)
  	mov	ecx, DCTSIZE				; ctr
  	alignx	16,7
  .rowloop:
  	push	edi
  	mov	edi, JSAMPROW [edi]			; (JSAMPLE *)
  	add	edi, JDIMENSION [output_col(ebp)]	; edi=outptr
  
  %ifndef NO_ZERO_ROW_TEST
  	mov	eax, INT [ROW(1,esi,SIZEOF_INT)]
  	or	eax, INT [ROW(2,esi,SIZEOF_INT)]
  	jnz	short .rowDCT
  
  	mov	ebx, INT [ROW(3,esi,SIZEOF_INT)]
  	mov	eax, INT [ROW(4,esi,SIZEOF_INT)]
  	or	ebx, INT [ROW(5,esi,SIZEOF_INT)]
  	or	eax, INT [ROW(6,esi,SIZEOF_INT)]
  	or	ebx, INT [ROW(7,esi,SIZEOF_INT)]
  	or	eax,ebx
  	jnz	short .rowDCT
  
  	; -- AC terms all zero
  
  	mov	eax, INT [ROW(0,esi,SIZEOF_INT)]
  
  	mov	edx, POINTER [range_limit]	; (JSAMPLE *)
  
  	descale	eax,(PASS1_BITS+3)
  	and	eax,RANGE_MASK
  	mov	al, JSAMPLE [edx+eax*SIZEOF_JSAMPLE]
  	mov	JSAMPLE [edi+0*SIZEOF_JSAMPLE], al
  	mov	JSAMPLE [edi+1*SIZEOF_JSAMPLE], al
  	mov	JSAMPLE [edi+2*SIZEOF_JSAMPLE], al
  	mov	JSAMPLE [edi+3*SIZEOF_JSAMPLE], al
  	mov	JSAMPLE [edi+4*SIZEOF_JSAMPLE], al
  	mov	JSAMPLE [edi+5*SIZEOF_JSAMPLE], al
  	mov	JSAMPLE [edi+6*SIZEOF_JSAMPLE], al
  	mov	JSAMPLE [edi+7*SIZEOF_JSAMPLE], al
  	jmp	near .nextrow
  	alignx	16,7
  %endif
  .rowDCT:
  	push	esi	; wsptr
  	push	ecx	; ctr
  
  	mov	POINTER [ptr], edi	; outptr
  
  	; -- Even part
  
  	mov	eax, INT [ROW(0,esi,SIZEOF_INT)]
  	mov	ebx, INT [ROW(2,esi,SIZEOF_INT)]
  	mov	ecx, INT [ROW(4,esi,SIZEOF_INT)]
  	mov	edi, INT [ROW(6,esi,SIZEOF_INT)]
  
  	lea	edx,[eax+ecx]		; edx=tmp10
  	sub	eax,ecx			; eax=tmp11
  
  	lea	ecx,[ebx+edi]		; ecx=tmp13
  	sub	ebx,edi
  	imul	ebx,(F_1_414)
  	descale	ebx,CONST_BITS
  	sub	ebx,ecx			; ebx=tmp12
  
  	lea	edi,[edx+ecx]		; edi=tmp0
  	sub	edx,ecx			; edx=tmp3
  	lea	ecx,[eax+ebx]		; ecx=tmp1
  	sub	eax,ebx			; eax=tmp2
  
  	push	edx		; tmp3
  	push	eax		; tmp2
  	push	ecx		; tmp1
  	push	edi		; tmp0
  
  	; -- Odd part
  
  	mov	eax, INT [ROW(1,esi,SIZEOF_INT)]
  	mov	ecx, INT [ROW(3,esi,SIZEOF_INT)]
  	mov	edi, INT [ROW(5,esi,SIZEOF_INT)]
  	mov	ebx, INT [ROW(7,esi,SIZEOF_INT)]
  
  	lea	esi,[eax+ebx]		; esi=z11
  	sub	eax,ebx			; eax=z12
  	lea	edx,[edi+ecx]		; edx=z13
  	sub	edi,ecx			; edi=z10
  
  	lea	ebx,[esi+edx]		; ebx=tmp7
  	sub	esi,edx
  	imul	esi,(F_1_414)		; esi=tmp11
  	descale	esi,CONST_BITS
  
  	lea	ecx,[edi+eax]
  	imul	ecx,(F_1_847)		; ecx=z5
  	imul	edi,(-F_2_613)		; edi=MULTIPLY(z10,-FIX_2_613125930)
  	imul	eax,(F_1_082)		; eax=MULTIPLY(z12,FIX_1_082392200)
  	descale	ecx,CONST_BITS
  	descale	edi,CONST_BITS
  	descale	eax,CONST_BITS
  	add	edi,ecx			; edi=tmp12
  	sub	eax,ecx			; eax=tmp10
  
  	; -- Final output stage
  
  	sub	edi,ebx		; edi=tmp6
  	pop	edx		; edx=tmp0
  	sub	esi,edi		; esi=tmp5
  	pop	ecx		; ecx=tmp1
  	add	eax,esi		; eax=tmp4
  	push	esi		; tmp5
  	push	eax		; tmp4
  
  	lea	eax,[edx+ebx]	; eax=data0(=tmp0+tmp7)
  	sub	edx,ebx		; edx=data7(=tmp0-tmp7)
  	lea	ebx,[ecx+edi]	; ebx=data1(=tmp1+tmp6)
  	sub	ecx,edi		; ecx=data6(=tmp1-tmp6)
  
  	mov	esi, POINTER [range_limit]	; (JSAMPLE *)
  
  	descale	eax,(PASS1_BITS+3)
  	descale	edx,(PASS1_BITS+3)
  	descale	ebx,(PASS1_BITS+3)
  	descale	ecx,(PASS1_BITS+3)
  
  	mov	edi, POINTER [ptr]		; edi=outptr
  
  	and	eax,RANGE_MASK
  	and	edx,RANGE_MASK
  	and	ebx,RANGE_MASK
  	and	ecx,RANGE_MASK
  
  	mov	al, JSAMPLE [esi+eax*SIZEOF_JSAMPLE]
  	mov	dl, JSAMPLE [esi+edx*SIZEOF_JSAMPLE]
  	mov	bl, JSAMPLE [esi+ebx*SIZEOF_JSAMPLE]
  	mov	cl, JSAMPLE [esi+ecx*SIZEOF_JSAMPLE]
  
  	mov	JSAMPLE [edi+0*SIZEOF_JSAMPLE], al
  	mov	JSAMPLE [edi+7*SIZEOF_JSAMPLE], dl
  	mov	JSAMPLE [edi+1*SIZEOF_JSAMPLE], bl
  	mov	JSAMPLE [edi+6*SIZEOF_JSAMPLE], cl
  
  	pop	esi		; esi=tmp4
  	pop	eax		; eax=tmp5
  	pop	edx		; edx=tmp2
  	pop	ecx		; ecx=tmp3
  
  	lea	ebx,[edx+eax]	; ebx=data2(=tmp2+tmp5)
  	sub	edx,eax		; edx=data5(=tmp2-tmp5)
  	lea	eax,[ecx+esi]	; eax=data4(=tmp3+tmp4)
  	sub	ecx,esi		; ecx=data3(=tmp3-tmp4)
  
  	mov	esi, POINTER [range_limit]	; (JSAMPLE *)
  
  	descale	ebx,(PASS1_BITS+3)
  	descale	edx,(PASS1_BITS+3)
  	descale	eax,(PASS1_BITS+3)
  	descale	ecx,(PASS1_BITS+3)
  
  	and	ebx,RANGE_MASK
  	and	edx,RANGE_MASK
  	and	eax,RANGE_MASK
  	and	ecx,RANGE_MASK
  
  	mov	bl, JSAMPLE [esi+ebx*SIZEOF_JSAMPLE]
  	mov	dl, JSAMPLE [esi+edx*SIZEOF_JSAMPLE]
  	mov	al, JSAMPLE [esi+eax*SIZEOF_JSAMPLE]
  	mov	cl, JSAMPLE [esi+ecx*SIZEOF_JSAMPLE]
  
  	mov	JSAMPLE [edi+2*SIZEOF_JSAMPLE], bl
  	mov	JSAMPLE [edi+5*SIZEOF_JSAMPLE], dl
  	mov	JSAMPLE [edi+4*SIZEOF_JSAMPLE], al
  	mov	JSAMPLE [edi+3*SIZEOF_JSAMPLE], cl
  
  	pop	ecx	; ctr
  	pop	esi	; wsptr
  
  .nextrow:
  	pop	edi
  	add	esi, byte DCTSIZE*SIZEOF_INT	; advance pointer to next row
  	add	edi, byte SIZEOF_JSAMPROW
  	dec	ecx
  	jnz	near .rowloop
  
  	pop	edi
  	pop	esi
  ;	pop	edx		; need not be preserved
  ;	pop	ecx		; need not be preserved
  	pop	ebx
  	mov	esp,ebp
  	pop	ebp
  	ret
  
  %endif ; DCT_IFAST_SUPPORTED
  

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