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1 # Alpha 21064 __mpn_lshift --
2
3 # Copyright (C) 1994-2019 Free Software Foundation, Inc.
4
5 # This file is part of the GNU MP Library.
6
7 # The GNU MP Library is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU Lesser General Public License as published by
9 # the Free Software Foundation; either version 2.1 of the License, or (at your
10 # option) any later version.
11
12 # The GNU MP Library is distributed in the hope that it will be useful, but
13 # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15 # License for more details.
16
17 # You should have received a copy of the GNU Lesser General Public License
18 # along with the GNU MP Library. If not, see <http://www.gnu.org/licenses/>.
19
20
21 # INPUT PARAMETERS
22 # res_ptr r16
23 # s1_ptr r17
24 # size r18
25 # cnt r19
26
27 # This code runs at 4.8 cycles/limb on the 21064. With infinite unrolling,
28 # it would take 4 cycles/limb. It should be possible to get down to 3
29 # cycles/limb since both ldq and stq can be paired with the other used
30 # instructions. But there are many restrictions in the 21064 pipeline that
31 # makes it hard, if not impossible, to get down to 3 cycles/limb:
32
33 # 1. ldq has a 3 cycle delay, srl and sll have a 2 cycle delay.
34 # 2. Only aligned instruction pairs can be paired.
35 # 3. The store buffer or silo might not be able to deal with the bandwidth.
36
37 .set noreorder
38 .set noat
39.text
40 .align 3
41 .globl __mpn_lshift
42 .ent __mpn_lshift
43__mpn_lshift:
44 .frame $30,0,$26,0
45
46 s8addq $18,$17,$17 # make r17 point at end of s1
47 ldq $4,-8($17) # load first limb
48 subq $17,8,$17
49 subq $31,$19,$7
50 s8addq $18,$16,$16 # make r16 point at end of RES
51 subq $18,1,$18
52 and $18,4-1,$20 # number of limbs in first loop
53 srl $4,$7,$0 # compute function result
54
55 beq $20,.L0
56 subq $18,$20,$18
57
58 .align 3
59.Loop0:
60 ldq $3,-8($17)
61 subq $16,8,$16
62 subq $17,8,$17
63 subq $20,1,$20
64 sll $4,$19,$5
65 srl $3,$7,$6
66 bis $3,$3,$4
67 bis $5,$6,$8
68 stq $8,0($16)
69 bne $20,.Loop0
70
71.L0: beq $18,.Lend
72
73 .align 3
74.Loop: ldq $3,-8($17)
75 subq $16,32,$16
76 subq $18,4,$18
77 sll $4,$19,$5
78 srl $3,$7,$6
79
80 ldq $4,-16($17)
81 sll $3,$19,$1
82 bis $5,$6,$8
83 stq $8,24($16)
84 srl $4,$7,$2
85
86 ldq $3,-24($17)
87 sll $4,$19,$5
88 bis $1,$2,$8
89 stq $8,16($16)
90 srl $3,$7,$6
91
92 ldq $4,-32($17)
93 sll $3,$19,$1
94 bis $5,$6,$8
95 stq $8,8($16)
96 srl $4,$7,$2
97
98 subq $17,32,$17
99 bis $1,$2,$8
100 stq $8,0($16)
101
102 bgt $18,.Loop
103
104.Lend: sll $4,$19,$8
105 stq $8,-8($16)
106 ret $31,($26),1
107 .end __mpn_lshift
108

Warning: That file was not part of the compilation database. It may have many parsing errors.