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1.1 maekawa 1: dnl Alpha EV5 __gmpn_lshift -- Shift a number left.
2:
3: dnl Copyright (C) 1994, 1995, 2000 Free Software Foundation, Inc.
4:
5: dnl This file is part of the GNU MP Library.
6:
7: dnl The GNU MP Library is free software; you can redistribute it and/or modify
8: dnl it under the terms of the GNU Lesser General Public License as published by
9: dnl the Free Software Foundation; either version 2.1 of the License, or (at your
10: dnl option) any later version.
11:
12: dnl The GNU MP Library is distributed in the hope that it will be useful, but
13: dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14: dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15: dnl License for more details.
16:
17: dnl You should have received a copy of the GNU Lesser General Public License
18: dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19: dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20: dnl MA 02111-1307, USA.
21:
22: include(`../config.m4')
23:
24: dnl INPUT PARAMETERS
25: dnl res_ptr r16
26: dnl s1_ptr r17
27: dnl size r18
28: dnl cnt r19
29:
30: dnl This code runs at 3.25 cycles/limb on the EV5.
31:
32: ASM_START()
33: PROLOGUE(mpn_lshift)
34: s8addq r18,r17,r17 C make r17 point at end of s1
35: ldq r4,-8(r17) C load first limb
36: subq r31,r19,r20
37: s8addq r18,r16,r16 C make r16 point at end of RES
38: subq r18,1,r18
39: and r18,4-1,r28 C number of limbs in first loop
40: srl r4,r20,r0 C compute function result
41:
42: beq r28,$L0
43: subq r18,r28,r18
44:
45: ALIGN(8)
46: $Loop0: ldq r3,-16(r17)
47: subq r16,8,r16
48: sll r4,r19,r5
49: subq r17,8,r17
50: subq r28,1,r28
51: srl r3,r20,r6
52: bis r3,r3,r4
53: bis r5,r6,r8
54: stq r8,0(r16)
55: bne r28,$Loop0
56:
57: $L0: sll r4,r19,r24
58: beq r18,$Lend
59: C warm up phase 1
60: ldq r1,-16(r17)
61: subq r18,4,r18
62: ldq r2,-24(r17)
63: ldq r3,-32(r17)
64: ldq r4,-40(r17)
65: beq r18,$Lend1
66: C warm up phase 2
67: srl r1,r20,r7
68: sll r1,r19,r21
69: srl r2,r20,r8
70: ldq r1,-48(r17)
71: sll r2,r19,r22
72: ldq r2,-56(r17)
73: srl r3,r20,r5
74: bis r7,r24,r7
75: sll r3,r19,r23
76: bis r8,r21,r8
77: srl r4,r20,r6
78: ldq r3,-64(r17)
79: sll r4,r19,r24
80: ldq r4,-72(r17)
81: subq r18,4,r18
82: beq r18,$Lend2
83: ALIGN(16)
84: C main loop
85: $Loop: stq r7,-8(r16)
86: bis r5,r22,r5
87: stq r8,-16(r16)
88: bis r6,r23,r6
89:
90: srl r1,r20,r7
91: subq r18,4,r18
92: sll r1,r19,r21
93: unop C ldq r31,-96(r17)
94:
95: srl r2,r20,r8
96: ldq r1,-80(r17)
97: sll r2,r19,r22
98: ldq r2,-88(r17)
99:
100: stq r5,-24(r16)
101: bis r7,r24,r7
102: stq r6,-32(r16)
103: bis r8,r21,r8
104:
105: srl r3,r20,r5
106: unop C ldq r31,-96(r17)
107: sll r3,r19,r23
108: subq r16,32,r16
109:
110: srl r4,r20,r6
111: ldq r3,-96(r17)
112: sll r4,r19,r24
113: ldq r4,-104(r17)
114:
115: subq r17,32,r17
116: bne r18,$Loop
117: C cool down phase 2/1
118: $Lend2: stq r7,-8(r16)
119: bis r5,r22,r5
120: stq r8,-16(r16)
121: bis r6,r23,r6
122: srl r1,r20,r7
123: sll r1,r19,r21
124: srl r2,r20,r8
125: sll r2,r19,r22
126: stq r5,-24(r16)
127: bis r7,r24,r7
128: stq r6,-32(r16)
129: bis r8,r21,r8
130: srl r3,r20,r5
131: sll r3,r19,r23
132: srl r4,r20,r6
133: sll r4,r19,r24
134: C cool down phase 2/2
135: stq r7,-40(r16)
136: bis r5,r22,r5
137: stq r8,-48(r16)
138: bis r6,r23,r6
139: stq r5,-56(r16)
140: stq r6,-64(r16)
141: C cool down phase 2/3
142: stq r24,-72(r16)
143: ret r31,(r26),1
144:
145: C cool down phase 1/1
146: $Lend1: srl r1,r20,r7
147: sll r1,r19,r21
148: srl r2,r20,r8
149: sll r2,r19,r22
150: srl r3,r20,r5
151: bis r7,r24,r7
152: sll r3,r19,r23
153: bis r8,r21,r8
154: srl r4,r20,r6
155: sll r4,r19,r24
156: C cool down phase 1/2
157: stq r7,-8(r16)
158: bis r5,r22,r5
159: stq r8,-16(r16)
160: bis r6,r23,r6
161: stq r5,-24(r16)
162: stq r6,-32(r16)
163: stq r24,-40(r16)
164: ret r31,(r26),1
165:
166: $Lend: stq r24,-8(r16)
167: ret r31,(r26),1
168: EPILOGUE(mpn_lshift)
169: ASM_END()