.pg
.x mulq
.x mulq3
.lt
------------------------------------------------------------------------
MULQ	mutliplier,product
MULQ3	multiplier,multipland,product
------------------------------------------------------------------------
.el
.b 3
These macros perform quadword multiplication.
.b
These macros will produce inline code to perform quadword multiplication.
After the multiplication is performed, r0 will contain the following values:
.b
.lt
	-1	if product < 0
	0	if product = 0
	1	if product > 0
.el
.b
The MULQ macro is equivalent to the expression:
.b
.lt
	product = multiplier * product
.el
.b
and the MULQ3 macro is equivalent to the expression:
.b
.lt
	product = multiplier * multipland
.el
.b
For example:
.b
.lt
	mulq3	multiplier,multipland,product
.el
.b
will produce the following code:
.b
.lt
		emul	multiplier,multipland,#0,product
		mull3	4+multiplier,multipland,r0
		mull3	multiplier,4+multipland,r1
		mull	r1,r0
		tstl	multiplier
		bgeq	30001$
		mull	multipland,r0
	30001$:	tstl	multipland
		bgeq	30002$
		mull	multiplier,r0
	30002$:	mull	r0,4+product
		tstl	4+product
		blss	30003$
		bgtr	30004$
		tstl	product
		bnequ	30004$
		clrl	r0
		brb	30005$
	30003$:	movl	#-1,r0
		brb	30005$
	30004$:	movl	#1,r0
	30005$:
.el
.b
See also ADDQ, ADDQ3, CMPQ, DIVQ4, SUBQ, SUBQ3 and TSTQ.