1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
dnl Itanium-2 mpn_gcd_11
dnl Copyright 2002-2005, 2012, 2013, 2015, 2019 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/bitpair (1x1 gcd)
C Itanium: ?
C Itanium 2: 4.5
ASM_START()
C ctz_table[n] is the number of trailing zeros on n, or MAXSHIFT if n==0.
deflit(MAXSHIFT, 7)
deflit(MASK, eval((m4_lshift(1,MAXSHIFT))-1))
.rodata
ALIGN(m4_lshift(1,MAXSHIFT)) C align table to allow using dep
ctz_table:
data1 MAXSHIFT
forloop(i,1,MASK,
` data1 m4_count_trailing_zeros(i)-1
')
define(`x0', r32)
define(`y0', r33)
PROLOGUE(mpn_gcd_11)
.prologue
.body
addl r22 = @ltoff(ctz_table), r1
;;
ld8 r22 = [r22]
br L(ent)
;;
ALIGN(32)
L(top):
.pred.rel "mutex", p6,p7
{.mmi; (p7) mov y0 = x0
(p6) sub x0 = x0, y0
dep r21 = r19, r22, 0, MAXSHIFT C concat(table,lowbits)
}{.mmi; and r20 = MASK, r19
(p7) mov x0 = r19
and r23 = 6, r19
;;
}{.mmi; cmp.eq p6,p0 = 4, r23
cmp.eq p7,p0 = 0, r23
shr.u x0 = x0, 1 C shift-by-1, always OK
}{.mmb; ld1 r16 = [r21]
cmp.eq p10,p0 = 0, r20
(p10) br.spnt.few.clr L(count_better)
;;
}
L(bck):
.pred.rel "mutex", p6,p7
{.mii; nop 0
(p6) shr.u x0 = x0, 1 C u was ...100 before shift-by-1 above
(p7) shr.u x0 = x0, r16 C u was ...000 before shift-by-1 above
;;
}
L(ent):
{.mmi; sub r19 = y0, x0
cmp.gtu p6,p7 = x0, y0
cmp.ne p8,p0 = x0, y0
}{.mmb; nop 0
nop 0
(p8) br.sptk.few.clr L(top)
}
L(end): mov r8 = y0
br.ret.sptk.many b0
L(count_better):
add r20 = -1, x0
;;
andcm r23 = r20, x0
;;
popcnt r16 = r23
br L(bck)
EPILOGUE()
|
