bexp.asm

CCS3.3自带的TI 5400系列DSP的dsplib文件。文档说明可以在TI公司网站上下载。

;***********************************************************
; Version 2.20.01                                           
;***********************************************************
;*********************************************************************************
;  Function:	bexp
;  Description: block exponent
;
;  Copyright Texas instruments Inc, 1998
;-----------------------------------------------------------------------------
; Revision History:
;  1.00, A. Aboagye, 8/31/98 - Original release.
;  2.20, Li Yuan, 9/07/01 - fixed temp varible location.
;
;********************************************************************************
	.mmregs

	.if __far_mode
offset	.set 1			; far mode uses one extra location for ret addr  ll
	.else
offset	.set 0
	.endif

	.asg	*sp(0),	one
	.asg	*sp(1),	temp
	.asg	*sp(5+offset),	arg_n

	.asg	ar2, in_ptr
	.asg	ar3, out_ptr

	.def	_bexp
	.text

_bexp:

        PSHM    ST0                                 ; 1 cycle
        PSHM    ST1                                 ; 1 cycle
        RSBX    OVA                                 ; 1 cycle
        RSBX    OVB                                 ; 1 cycle

	frame	#-2
	nop
	ld	arg_n, B
	sub	#1, B
	stlm	B, brc
	st	#1h, one
	stlm	A, in_ptr

	rptbd	endLoop - 1
	st	#020h, temp

mainLoop:
	ld	*in_ptr+, 16, A
	exp	A
	nop
	mpy	one, A
	sub	temp, A
	nop
	nop
	xc	1, ALT
	st	T, temp
endLoop:

return:
	ld	temp, A

	frame	#2
        POPM    ST1                                 ; 1 cycle
        POPM    ST0                                 ; 1 cycle

	.if	__far_mode
	fret
	.else
	ret
	.endif
;end of file. please do not remove. it is left here to ensure that no lines of code are removed by any editor