1dnl  ARM64 mpn_addlshC_n, mpn_sublshC_n, mpn_rsblshC_n.
2
3dnl  Contributed to the GNU project by Torbj��rn Granlund.
4
5dnl  Copyright 2017 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 Cortex-A53	3.25-3.75
37C Cortex-A57	 2.18
38C X-Gene	 2.5
39
40changecom(blah)
41
42define(`rp', `x0')
43define(`up', `x1')
44define(`vp', `x2')
45define(`n',  `x3')
46
47ifdef(`DO_add', `
48  define(`ADDSUB',	`adds	$1, $2, $3')
49  define(`ADDSUBC',	`adcs	$1, $2, $3')
50  define(`CLRRCY',	`adds	$1, xzr, xzr')
51  define(`RETVAL',	`adc	x0, $1, xzr')
52  define(`func_n',	mpn_addlsh`'LSH`'_n)')
53ifdef(`DO_sub', `
54  define(`ADDSUB',	`subs	$1, $3, $2')
55  define(`ADDSUBC',	`sbcs	$1, $3, $2')
56  define(`CLRRCY',	`subs	$1, xzr, xzr')
57  define(`RETVAL',	`cinc	x0, $1, cc')
58  define(`func_n',	mpn_sublsh`'LSH`'_n)')
59ifdef(`DO_rsb', `
60  define(`ADDSUB',	`subs	$1, $2, $3')
61  define(`ADDSUBC',	`sbcs	$1, $2, $3')
62  define(`CLRRCY',	`subs	$1, xzr, xzr')
63  define(`RETVAL',	`sbc	x0, $1, xzr')
64  define(`func_n',	mpn_rsblsh`'LSH`'_n)')
65
66ASM_START()
67PROLOGUE(func_n)
68	lsr	x18, n, #2
69	tbz	n, #0, L(bx0)
70
71L(bx1):	ldr	x5, [up]
72	tbnz	n, #1, L(b11)
73
74L(b01):	ldr	x11, [vp]
75	cbz	x18, L(1)
76	ldp	x8, x9, [vp,#8]
77	lsl	x13, x11, #LSH
78	ADDSUB(	x15, x13, x5)
79	str	x15, [rp],#8
80	sub	up, up, #24
81	sub	vp, vp, #8
82	b	L(mid)
83
84L(1):	lsl	x13, x11, #LSH
85	ADDSUB(	x15, x13, x5)
86	str	x15, [rp]
87	lsr	x0, x11, RSH
88	RETVAL(	 x0, x1)
89	ret
90
91L(b11):	ldr	x9, [vp]
92	ldp	x10, x11, [vp,#8]!
93	lsl	x13, x9, #LSH
94	ADDSUB(	x17, x13, x5)
95	str	x17, [rp],#8
96	sub	up, up, #8
97	cbz	x18, L(end)
98	b	L(top)
99
100L(bx0):	tbnz	n, #1, L(b10)
101
102L(b00):	CLRRCY(	x11)
103	ldp	x8, x9, [vp],#-16
104	sub	up, up, #32
105	b	L(mid)
106
107L(b10):	CLRRCY(	x9)
108	ldp	x10, x11, [vp]
109	sub	up, up, #16
110	cbz	x18, L(end)
111
112	ALIGN(16)
113L(top):	ldp	x4, x5, [up,#16]
114	extr	x12, x10, x9, #RSH
115	ldp	x8, x9, [vp,#16]
116	extr	x13, x11, x10, #RSH
117	ADDSUBC(x14, x12, x4)
118	ADDSUBC(x15, x13, x5)
119	stp	x14, x15, [rp],#16
120L(mid):	ldp	x4, x5, [up,#32]!
121	extr	x12, x8, x11, #RSH
122	ldp	x10, x11, [vp,#32]!
123	extr	x13, x9, x8, #RSH
124	ADDSUBC(x16, x12, x4)
125	ADDSUBC(x17, x13, x5)
126	stp	x16, x17, [rp],#16
127	sub	x18, x18, #1
128	cbnz	x18, L(top)
129
130L(end):	ldp	x4, x5, [up,#16]
131	extr	x12, x10, x9, #RSH
132	extr	x13, x11, x10, #RSH
133	ADDSUBC(x14, x12, x4)
134	ADDSUBC(x15, x13, x5)
135	stp	x14, x15, [rp]
136	lsr	x0, x11, RSH
137	RETVAL(	 x0, x1)
138	ret
139EPILOGUE()
140