/* *	mpvecadd(mpdigit *a, int alen, mpdigit *b, int blen, mpdigit *sum) * *		sum[0:alen] = a[0:alen-1] + b[0:blen-1] * *	prereq: alen >= blen, sum has room for alen+1 digits */TEXT	mpvecadd(SB),$0 	MOVL	alen+8(FP),DX	MOVL	blen+24(FP),CX/*	MOVL	a+0(FP),SI */	MOVQ	RARG, SI	MOVQ	b+16(FP),BX	SUBL	CX,DX	MOVQ	sum+32(FP),DI	XORL	BP,BP			/* this also sets carry to 0 */ 	/* skip addition if b is zero */	TESTL	CX,CX	JZ	_add1 	/* sum[0:blen-1],carry = a[0:blen-1] + b[0:blen-1] */_addloop1:	MOVL	(SI)(BP*4), AX	ADCL	(BX)(BP*4), AX	MOVL	AX,(DI)(BP*4)	INCL	BP	LOOP	_addloop1 _add1:	/* jump if alen > blen */	INCL	DX	MOVL	DX,CX	LOOP	_addloop2 	/* sum[alen] = carry */_addend:	JC	_addcarry	MOVL	$0,(DI)(BP*4)	RET_addcarry:	MOVL	$1,(DI)(BP*4)	RET 	/* sum[blen:alen-1],carry = a[blen:alen-1] + 0 */_addloop2:	MOVL	(SI)(BP*4),AX	ADCL	$0,AX	MOVL	AX,(DI)(BP*4)	INCL	BP	LOOP	_addloop2	JMP	_addend