dnl  mc68020 mpn_mul_1 -- mpn by limb multiply

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dnl
dnl  This file is part of the GNU MP Library.
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dnl  Lesser General Public License for more details.
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include(`../config.m4')

C         cycles/limb
C 68040:     24

C INPUT PARAMETERS
C res_ptr	(sp + 4)
C s1_ptr	(sp + 8)
C s1_size	(sp + 12)
C s2_limb	(sp + 16)


define(res_ptr, `a0')
define(s1_ptr,  `a1')
define(s1_size, `d2')
define(s2_limb, `d4')


PROLOGUE(mpn_mul_1)

C Save used registers on the stack.
	moveml	d2-d4, M(-,sp)

C	movel	d2, M(-,sp)
C	movel	d3, M(-,sp)
C	movel	d4, M(-,sp)

C Copy the arguments to registers.  Better use movem?
	movel	M(sp,16), res_ptr
	movel	M(sp,20), s1_ptr
	movel	M(sp,24), s1_size
	movel	M(sp,28), s2_limb

	eorw	#1, s1_size
	clrl	d1
	lsrl	#1, s1_size
	bcc	L(L1)
	subql	#1, s1_size
	subl	d0, d0		C (d0,cy) <= (0,0)

L(Loop):
	movel	M(s1_ptr,+), d3
	mulul	s2_limb, d1:d3
	addxl	d0, d3
	movel	d3, M(res_ptr,+)
L(L1):	movel	M(s1_ptr,+), d3
	mulul	s2_limb, d0:d3
	addxl	d1, d3
	movel	d3, M(res_ptr,+)

	dbf	s1_size, L(Loop)
	clrl	d3
	addxl	d3, d0
	subl	#0x10000, s1_size
	bcc	L(Loop)

C Restore used registers from stack frame.
	moveml	M(sp,+), d2-d4

C	movel	M(sp,+),d4
C	movel	M(sp,+),d3
C	movel	M(sp,+),d2

	rts

EPILOGUE(mpn_mul_1)