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Austin Schuhbb1338c2024-06-15 19:31:16 -07001dnl SPARC v9 mpn_rshift
2
3dnl Contributed to the GNU project by David Miller.
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 1&2: 2
37C UltraSPARC 3: 2.5
38C UltraSPARC T1: 17.5
39C UltraSPARC T3: 8
40C UltraSPARC T4: 3
41
42C INPUT PARAMETERS
43define(`rp', `%i0')
44define(`up', `%i1')
45define(`n', `%i2')
46define(`cnt', `%i3')
47
48define(`tcnt', `%i4')
49define(`retval', `%i5')
50define(`u0', `%l0')
51define(`u1', `%l1')
52define(`r0', `%l6')
53define(`r1', `%l7')
54define(`u0_off', `%o0')
55define(`u1_off', `%o1')
56define(`r0_off', `%o2')
57define(`r1_off', `%o3')
58
59ASM_START()
60 REGISTER(%g2,#scratch)
61 REGISTER(%g3,#scratch)
62PROLOGUE(mpn_rshift)
63 save %sp, -176, %sp
64
65 sllx n, 3, n
66 sub %g0, cnt, tcnt
67
68 add up, n, up
69 add rp, n, rp
70
71 neg n, n
72 sub up, (2 * 8), u0_off
73 sub rp, (5 * 8), r0_off
74
75 ldx [n + up], u1 C WAS: up + 0
76 sub u0_off, (1 * 8), u1_off
77 sub r0_off, (1 * 8), r1_off
78
79 subcc n, -(3 * 8), n
80 sllx u1, tcnt, retval
81
82 bg,pn %xcc, L(end12)
83 srlx u1, cnt, %l3
84
85 ldx [n + u0_off], u0 C WAS: up + 0
86 subcc n, -(2 * 8), n
87
88 ldx [n + u1_off], u1 C WAS: up + 8
89
90 bg,pn %xcc, L(end34)
91 sllx u0, tcnt, %l4
92
93 b,a L(top)
94 ALIGN(16)
95L(top):
96 srlx u0, cnt, %l2
97 or %l3, %l4, r0
98
99 ldx [n + u0_off], u0 C WAS: up + 0
100 sllx u1, tcnt, %l5
101
102 stx r0, [n + r0_off] C WAS: rp + 0
103 subcc n, -(2 * 8), n
104
105 srlx u1, cnt, %l3
106 or %l2, %l5, r1
107
108 ldx [n + u1_off], u1 C WAS: up + 8
109 sllx u0, tcnt, %l4
110
111 ble,pt %xcc, L(top)
112 stx r1, [n + r1_off] C WAS: rp + 8
113
114L(end34):
115 srlx u0, cnt, %l2
116 or %l3, %l4, r0
117
118 sllx u1, tcnt, %l5
119 stx r0, [n + r0_off] C WAS: rp + 0
120
121 or %l2, %l5, r1
122 sub n, -(2 * 8), %o5
123
124 srlx u1, cnt, %l3
125 stx r1, [%o5 + r1_off] C WAS: rp + 8
126
127L(end12):
128 andcc n, 8, %g0
129 bz,pn %xcc, L(done)
130 nop
131
132 ldx [n + u0_off], u1
133 sllx u1, tcnt, %l4
134 or %l3, %l4, r0
135 stx r0, [r0_off + 24]
136 srlx u1, cnt, %l3
137L(done):
138 stx %l3, [r0_off + 32]
139
140 ret
141 restore retval, 0, %o0
142EPILOGUE()