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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
dnl IA-64 mpn_divexact_1 -- mpn by limb exact division.
dnl Contributed to the GNU project by Torbjorn Granlund and Kevin Ryde.
dnl Copyright 2003-2005, 2010 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/limb
C Itanium: 16
C Itanium 2: 8
C INPUT PARAMETERS
define(`rp', `r32')
define(`up', `r33')
define(`n', `r34')
define(`divisor', `r35')
define(`lshift', `r24')
define(`rshift', `r25')
C This code is a bit messy, and not as similar to mode1o.asm as desired.
C The critical path during initialization is for computing the inverse of the
C divisor. Since odd divisors are probably common, we conditionally execute
C the initial count_trailing_zeros code and the downshift.
C Possible improvement: Merge more of the feed-in code into the inverse
C computation.
ASM_START()
.text
.align 32
.Ltab:
data1 0,0x01, 0,0xAB, 0,0xCD, 0,0xB7, 0,0x39, 0,0xA3, 0,0xC5, 0,0xEF
data1 0,0xF1, 0,0x1B, 0,0x3D, 0,0xA7, 0,0x29, 0,0x13, 0,0x35, 0,0xDF
data1 0,0xE1, 0,0x8B, 0,0xAD, 0,0x97, 0,0x19, 0,0x83, 0,0xA5, 0,0xCF
data1 0,0xD1, 0,0xFB, 0,0x1D, 0,0x87, 0,0x09, 0,0xF3, 0,0x15, 0,0xBF
data1 0,0xC1, 0,0x6B, 0,0x8D, 0,0x77, 0,0xF9, 0,0x63, 0,0x85, 0,0xAF
data1 0,0xB1, 0,0xDB, 0,0xFD, 0,0x67, 0,0xE9, 0,0xD3, 0,0xF5, 0,0x9F
data1 0,0xA1, 0,0x4B, 0,0x6D, 0,0x57, 0,0xD9, 0,0x43, 0,0x65, 0,0x8F
data1 0,0x91, 0,0xBB, 0,0xDD, 0,0x47, 0,0xC9, 0,0xB3, 0,0xD5, 0,0x7F
data1 0,0x81, 0,0x2B, 0,0x4D, 0,0x37, 0,0xB9, 0,0x23, 0,0x45, 0,0x6F
data1 0,0x71, 0,0x9B, 0,0xBD, 0,0x27, 0,0xA9, 0,0x93, 0,0xB5, 0,0x5F
data1 0,0x61, 0,0x0B, 0,0x2D, 0,0x17, 0,0x99, 0,0x03, 0,0x25, 0,0x4F
data1 0,0x51, 0,0x7B, 0,0x9D, 0,0x07, 0,0x89, 0,0x73, 0,0x95, 0,0x3F
data1 0,0x41, 0,0xEB, 0,0x0D, 0,0xF7, 0,0x79, 0,0xE3, 0,0x05, 0,0x2F
data1 0,0x31, 0,0x5B, 0,0x7D, 0,0xE7, 0,0x69, 0,0x53, 0,0x75, 0,0x1F
data1 0,0x21, 0,0xCB, 0,0xED, 0,0xD7, 0,0x59, 0,0xC3, 0,0xE5, 0,0x0F
data1 0,0x11, 0,0x3B, 0,0x5D, 0,0xC7, 0,0x49, 0,0x33, 0,0x55, 0,0xFF
PROLOGUE(mpn_divexact_1)
.prologue
.save ar.lc, r2
.body
{.mmi; add r8 = -1, divisor C M0
nop 0 C M1
tbit.z p8, p9 = divisor, 0 C I0
}
ifdef(`HAVE_ABI_32',
` addp4 rp = 0, rp C M2 rp extend
addp4 up = 0, up C M3 up extend
sxt4 n = n') C I1 size extend
;;
.Lhere:
{.mmi; ld8 r20 = [up], 8 C M0 up[0]
(p8) andcm r8 = r8, divisor C M1
mov r15 = ip C I0 .Lhere
;;
}{.mii
.pred.rel "mutex", p8, p9
(p9) mov rshift = 0 C M0
(p8) popcnt rshift = r8 C I0 r8 = cnt_lo_zeros(divisor)
cmp.eq p6, p10 = 1, n C I1
;;
}{.mii; add r9 = .Ltab-.Lhere, r15 C M0
(p8) shr.u divisor = divisor, rshift C I0
nop 0 C I1
;;
}{.mmi; add n = -4, n C M0 size-1
(p10) ld8 r21 = [up], 8 C M1 up[1]
mov r14 = 2 C M1 2
}{.mfi; setf.sig f6 = divisor C M2 divisor
mov f9 = f0 C M3 carry FIXME
zxt1 r3 = divisor C I1 divisor low byte
;;
}{.mmi; add r3 = r9, r3 C M0 table offset ip and index
sub r16 = 0, divisor C M1 -divisor
mov r2 = ar.lc C I0
}{.mmi; sub lshift = 64, rshift C M2
setf.sig f13 = r14 C M3 2 in significand
mov r17 = -1 C I1 -1
;;
}{.mmi; ld1 r3 = [r3] C M0 inverse, 8 bits
nop 0 C M1
mov ar.lc = n C I0 size-1 loop count
}{.mmi; setf.sig f12 = r16 C M2 -divisor
setf.sig f8 = r17 C M3 -1
cmp.eq p7, p0 = -2, n C I1
;;
}{.mmi; setf.sig f7 = r3 C M2 inverse, 8 bits
cmp.eq p8, p0 = -1, n C M0
shr.u r23 = r20, rshift C I0
;;
}
C f6 divisor
C f7 inverse, being calculated
C f8 -1, will be -inverse
C f9 carry
C f12 -divisor
C f13 2
C f14 scratch
xmpy.l f14 = f13, f7 C Newton 2*i
xmpy.l f7 = f7, f7 C Newton i*i
;;
xma.l f7 = f7, f12, f14 C Newton i*i*-d + 2*i, 16 bits
;;
setf.sig f10 = r23 C speculative, used iff n = 1
xmpy.l f14 = f13, f7 C Newton 2*i
shl r22 = r21, lshift C speculative, used iff n > 1
xmpy.l f7 = f7, f7 C Newton i*i
;;
or r31 = r22, r23 C speculative, used iff n > 1
xma.l f7 = f7, f12, f14 C Newton i*i*-d + 2*i, 32 bits
shr.u r23 = r21, rshift C speculative, used iff n > 1
;;
setf.sig f11 = r31 C speculative, used iff n > 1
xmpy.l f14 = f13, f7 C Newton 2*i
xmpy.l f7 = f7, f7 C Newton i*i
;;
xma.l f7 = f7, f12, f14 C Newton i*i*-d + 2*i, 64 bits
(p7) br.cond.dptk .Ln2
(p10) br.cond.dptk .grt3
;;
.Ln1: xmpy.l f12 = f10, f7 C q = ulimb * inverse
br .Lx1
.Ln2:
xmpy.l f8 = f7, f8 C -inverse = inverse * -1
xmpy.l f12 = f11, f7 C q = ulimb * inverse
setf.sig f11 = r23
br .Lx2
.grt3:
ld8 r21 = [up], 8 C up[2]
xmpy.l f8 = f7, f8 C -inverse = inverse * -1
;;
shl r22 = r21, lshift
;;
xmpy.l f12 = f11, f7 C q = ulimb * inverse
;;
or r31 = r22, r23
shr.u r23 = r21, rshift
;;
setf.sig f11 = r31
(p8) br.cond.dptk .Lx3 C branch for n = 3
;;
ld8 r21 = [up], 8
br .Lent
.Ltop: ld8 r21 = [up], 8
xma.l f12 = f9, f8, f10 C q = c * -inverse + si
nop.b 0
;;
.Lent: add r16 = 160, up
shl r22 = r21, lshift
nop.b 0
;;
stf8 [rp] = f12, 8
xma.hu f9 = f12, f6, f9 C c = high(q * divisor + c)
nop.b 0
nop.m 0
xmpy.l f10 = f11, f7 C si = ulimb * inverse
nop.b 0
;;
or r31 = r22, r23
shr.u r23 = r21, rshift
nop.b 0
;;
lfetch [r16]
setf.sig f11 = r31
br.cloop.sptk.few.clr .Ltop
xma.l f12 = f9, f8, f10 C q = c * -inverse + si
;;
.Lx3: stf8 [rp] = f12, 8
xma.hu f9 = f12, f6, f9 C c = high(q * divisor + c)
xmpy.l f10 = f11, f7 C si = ulimb * inverse
;;
setf.sig f11 = r23
;;
xma.l f12 = f9, f8, f10 C q = c * -inverse + si
;;
.Lx2: stf8 [rp] = f12, 8
xma.hu f9 = f12, f6, f9 C c = high(q * divisor + c)
xmpy.l f10 = f11, f7 C si = ulimb * inverse
;;
xma.l f12 = f9, f8, f10 C q = c * -inverse + si
;;
.Lx1: stf8 [rp] = f12, 8
mov ar.lc = r2 C I0
br.ret.sptk.many b0
EPILOGUE()
|