1dnl  SPARC T3/T4/T5 mpn_bdiv_dbm1c.
2
3dnl  Contributed to the GNU project by Torbj��rn Granlund.
4
5dnl  Copyright 2013 Free Software Foundation, Inc.
6
7dnl  This file is part of the GNU MP Library.
8dnl
9dnl  The GNU MP Library is free software; you can redistribute it and/or modify
10dnl  it under the terms of either:
11dnl
12dnl    * the GNU Lesser General Public License as published by the Free
13dnl      Software Foundation; either version 3 of the License, or (at your
14dnl      option) any later version.
15dnl
16dnl  or
17dnl
18dnl    * the GNU General Public License as published by the Free Software
19dnl      Foundation; either version 2 of the License, or (at your option) any
20dnl      later version.
21dnl
22dnl  or both in parallel, as here.
23dnl
24dnl  The GNU MP Library is distributed in the hope that it will be useful, but
25dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
26dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
27dnl  for more details.
28dnl
29dnl  You should have received copies of the GNU General Public License and the
30dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
31dnl  see https://www.gnu.org/licenses/.
32
33include(`../config.m4')
34
35C                  cycles/limb
36C UltraSPARC T3:	25
37C UltraSPARC T4/T5:	 4
38
39C INPUT PARAMETERS
40define(`qp',  `%i0')
41define(`ap',  `%i1')
42define(`n',   `%i2')
43define(`bd',  `%i3')
44define(`h',   `%i4')
45
46define(`plo0',`%g4')  define(`plo1',`%g5')
47define(`phi0',`%l0')  define(`phi1',`%l1')
48define(`a0',  `%g1')  define(`a1',  `%g3')
49
50ASM_START()
51	REGISTER(%g2,#scratch)
52	REGISTER(%g3,#scratch)
53PROLOGUE(mpn_bdiv_dbm1c)
54	save	%sp, -176, %sp
55
56	and	n, 3, %g5
57	ldx	[ap + 0], %g2
58	add	n, -5, n
59	brz	%g5, L(b0)
60	 cmp	%g5, 2
61	bcs	%xcc, L(b1)
62	 nop
63	be	%xcc, L(b2)
64	 nop
65
66L(b3):	ldx	[ap + 8], a0
67	mulx	bd, %g2, plo1
68	umulxhi(bd, %g2, phi1)
69	ldx	[ap + 16], a1
70	add	qp, -24, qp
71	b	L(lo3)
72	 add	ap, -8, ap
73
74L(b2):	ldx	[ap + 8], a1
75	mulx	bd, %g2, plo0
76	umulxhi(bd, %g2, phi0)
77	brlz,pt n, L(wd2)
78	 nop
79L(gt2):	ldx	[ap + 16], a0
80	add	ap, 16, ap
81	b	L(lo2)
82	 add	n, -1, n
83
84L(b1):	mulx	bd, %g2, plo1
85	 umulxhi(bd, %g2, phi1)
86	brlz,pn	n, L(wd1)
87	 add	qp, -8, qp
88L(gt1):	ldx	[ap + 8], a0
89	ldx	[ap + 16], a1
90	b	L(lo1)
91	 add	ap, 8, ap
92
93L(b0):	ldx	[ap + 8], a1
94	mulx	bd, %g2, plo0
95	umulxhi(bd, %g2, phi0)
96	ldx	[ap + 16], a0
97	b	L(lo0)
98	 add	qp, -16, qp
99
100L(top):	ldx	[ap + 0], a0
101	sub	h, phi1, h
102L(lo2):	mulx	bd, a1, plo1
103	umulxhi(bd, a1, phi1)
104	subcc	h, plo0, h
105	addxc(	phi0, %g0, phi0)
106	stx	h, [qp + 0]
107	ldx	[ap + 8], a1
108	sub	h, phi0, h
109L(lo1):	mulx	bd, a0, plo0
110	umulxhi(bd, a0, phi0)
111	subcc	h, plo1, h
112	addxc(	phi1, %g0, phi1)
113	stx	h, [qp + 8]
114	ldx	[ap + 16], a0
115	sub	h, phi1, h
116L(lo0):	mulx	bd, a1, plo1
117	umulxhi(bd, a1, phi1)
118	subcc	h, plo0, h
119	addxc(	phi0, %g0, phi0)
120	stx	h, [qp + 16]
121	ldx	[ap + 24], a1
122	sub	h, phi0, h
123L(lo3):	mulx	bd, a0, plo0
124	umulxhi(bd, a0, phi0)
125	subcc	h, plo1, h
126	addxc(	phi1, %g0, phi1)
127	stx	h, [qp + 24]
128	add	ap, 32, ap
129	add	qp, 32, qp
130	brgz,pt	n, L(top)
131	 add	n, -4, n
132
133L(end):	sub	h, phi1, h
134L(wd2):	mulx	bd, a1, plo1
135	umulxhi(bd, a1, phi1)
136	subcc	h, plo0, h
137	addxc(	phi0, %g0, phi0)
138	stx	h, [qp + 0]
139	sub	h, phi0, h
140L(wd1):	subcc	h, plo1, h
141	addxc(	phi1, %g0, phi1)
142	stx	h, [qp + 8]
143	sub	h, phi1, %i0
144
145	ret
146	 restore
147EPILOGUE()
148