jbig.h

基于ADI BLACKFIN的jbig压缩和解压缩程序

// This macro specifies a P-register to point to a C-style variable.
#define POINT_TO_ANY(reg, val)	\
			reg##.h = hi(val);	\
			reg##.l = lo(val)

				
.extern _jbg_lsz, _jbg_nmps, _jbg_nlps;


#define SAVE_ALL_REGISTERS()	\
		[--sp] = (r7:4, p5:3)	

		
#define POP_ALL_REGISTERS()		\
		(r7:4, p5:3) = [sp++]

// The following macros are for arith_encode




#define PC_REG		p0

#define PA_REG		p0 + 4

#define PSC			p0 + 8

#define PCT			p0 + 12

#define PBUF		p0 + 16

#define PST			p0 + 20

#define PENC_STATE	p0 + 1044


// Globally, we assume the following registers:


//	I2: Pointer to current sde index

//	R3:	A-register

//  R4: C-register

//	Globally initialization


	
#define A_REG		r3
#define C_REG		r4


// In the first term, we assume the following temp registers:

//	P0: &st[cx]

//	P1: jbg_lsz

//	P3: jbg_nlps/jbg_nmps

//	P4:	SS, the index of jbg_lsz, jbg_nlps and jbg_nmps

//	R0: *st, st[cx]

#define PST_CX		p2
#define JBG_LSZ		p1
#define JBG_NLPS	p3
#define JBG_NMPS	p3
#define _SS			p4
#define CX			p5
	
#define ST_CX		R0
#define PIX			R3
#define LSZ			R1


// In the second term, the following registers will be assumed.
	
// P1: &ct
	
// P2: &sc

// P3: &buffer
	
// P4: current sde index
	
// R1: SC
	
// R2: buffer
	
// R5: temp
	

#define CUR_SDE		P4
#define CT			P5
	
#define SC			P1
#define BUF			R2
#define TEMP		R5
	
#define CONST_ZERO	R6
#define CONST_FF	R1
#define CONST_8000	R7


#define FCT			R0

#define FSC			R7


// Typical prediction

#define _P1				p1

#define HP				p1

#define _Q1				p2

#define HBPL			b1

#define N_HBPL			b2

#define CUR_SDE_SAVE	b0

#define LTP				r3

#define LTP_OLD			m0

#define Y				r4

#define HP_STORAGE		i3

#define SRC_HP			a1

#define Y_STORAGE		i2

#define SRC_SDE			m1

#define VENC_STATE		m2

#define VARENC_STATE	m3

#define HP1				l2

#define HY				l3



#define PXD			p0

#define PYD			p0 + 4

#define PL0			p0 + 8

#define PSTRIPES	p0 + 12

#define PLHP		p0 + 16

#define PHIGHRES	p0 + 20

#define PSDE		p0 + 24

#define PSDE_INDEX	p0 + 28

#define PLTP_OLD	p0 + 32

#define PS			p0 + 36



#define LINE_H1			r3

#define LINE_H2			r1

// #define LINE_H3			r5