1dnl  S/390-32 mpn_rshift.
2
3dnl  Copyright 2011 Free Software Foundation, Inc.
4
5dnl  This file is part of the GNU MP Library.
6dnl
7dnl  The GNU MP Library is free software; you can redistribute it and/or modify
8dnl  it under the terms of either:
9dnl
10dnl    * the GNU Lesser General Public License as published by the Free
11dnl      Software Foundation; either version 3 of the License, or (at your
12dnl      option) any later version.
13dnl
14dnl  or
15dnl
16dnl    * the GNU General Public License as published by the Free Software
17dnl      Foundation; either version 2 of the License, or (at your option) any
18dnl      later version.
19dnl
20dnl  or both in parallel, as here.
21dnl
22dnl  The GNU MP Library is distributed in the hope that it will be useful, but
23dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
24dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
25dnl  for more details.
26dnl
27dnl  You should have received copies of the GNU General Public License and the
28dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
29dnl  see https://www.gnu.org/licenses/.
30
31include(`../config.m4')
32
33C            cycles/limb
34C z900		 6
35C z990	         3
36C z9		 ?
37C z10		 ?
38C z196		 ?
39
40C TODO
41C  *
42
43C INPUT PARAMETERS
44define(`rp',	`%r2')
45define(`up',	`%r3')
46define(`n',	`%r4')
47define(`cnt',	`%r5')
48
49ASM_START()
50PROLOGUE(mpn_rshift)
51	stm	%r6, %r12, 24(%r15)
52	lhi	%r8, 32
53	sr	%r8, cnt
54	l	%r12, 0(up)
55	sll	%r12, 0(%r8)		C return value
56	lhi	%r7, 3
57	nr	%r7, n
58	srl	n, 2
59	je	L(b0)
60	chi	%r7, 2
61	jl	L(b1)
62	je	L(b2)
63
64L(b3):	l	%r11, 0(up)
65	l	%r10, 4(up)
66	l	%r8,  8(up)
67	ahi	up, 8
68	lr	%r9, %r10
69	srdl	%r10, 0(cnt)
70	srdl	%r8,  0(cnt)
71	st	%r11, 0(rp)
72	st	%r9,  4(rp)
73	ahi	rp, 8
74	ltr	n, n
75	je	L(end)
76	j	L(top)
77
78L(b2):	l	%r11, 0(up)
79	l	%r10, 4(up)
80	ahi	up, 4
81	srdl	%r10, 0(cnt)
82	st	%r11, 0(rp)
83	ahi	rp, 4
84	ltr	n, n
85	je	L(end)
86	j	L(top)
87
88L(b1):	ltr	n, n
89	je	L(end)
90	j	L(top)
91
92L(b0):	l	%r11, 0(up)
93	l	%r9,  4(up)
94	l	%r7,  8(up)
95	l	%r1, 12(up)
96	ahi	up, 12
97	lr	%r10, %r9
98	lr	%r8,  %r7
99	lr	%r6,  %r1
100	srdl	%r10, 0(cnt)
101	srdl	%r8,  0(cnt)
102	srdl	%r6,  0(cnt)
103	st	%r11, 0(rp)
104	st	%r9,  4(rp)
105	st	%r7,  8(rp)
106	ahi	rp, 12
107	ahi	n, -1
108	je	L(end)
109
110	ALIGN(8)
111L(top):	l	%r11, 0(up)
112	l	%r9,  4(up)
113	l	%r7,  8(up)
114	l	%r1, 12(up)
115	l	%r0, 16(up)
116	lr	%r10, %r9
117	lr	%r8,  %r7
118	lr	%r6,  %r1
119	ahi	up, 16
120	srdl	%r10, 0(cnt)
121	srdl	%r8,  0(cnt)
122	srdl	%r6,  0(cnt)
123	srdl	%r0,  0(cnt)
124	st	%r11, 0(rp)
125	st	%r9,  4(rp)
126	st	%r7,  8(rp)
127	st	%r1, 12(rp)
128	ahi	rp, 16
129	brct	n, L(top)
130
131L(end):	l	%r11, 0(up)
132	srl	%r11, 0(cnt)
133	st	%r11, 0(rp)
134
135	lr	%r2, %r12
136	lm	%r6, %r12, 24(%r15)
137	br	%r14
138EPILOGUE()
139