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
|
/***********************************************************************/
/* */
/* Objective Caml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 2003 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License, with */
/* the special exception on linking described in file ../../LICENSE. */
/* */
/***********************************************************************/
/* $Id: bng_amd64.c 9547 2010-01-22 12:48:24Z doligez $ */
/* Code specific to the AMD x86_64 architecture. */
#define BngAdd2(res,carryout,arg1,arg2) \
asm("xorl %1, %1 \n\t" \
"addq %3, %0 \n\t" \
"setc %b1" \
: "=r" (res), "=&q" (carryout) \
: "0" (arg1), "rm" (arg2))
#define BngSub2(res,carryout,arg1,arg2) \
asm("xorl %1, %1 \n\t" \
"subq %3, %0 \n\t" \
"setc %b1" \
: "=r" (res), "=&q" (carryout) \
: "0" (arg1), "rm" (arg2))
#define BngMult(resh,resl,arg1,arg2) \
asm("mulq %3" \
: "=a" (resl), "=d" (resh) \
: "a" (arg1), "r" (arg2))
#define BngDiv(quo,rem,nh,nl,d) \
asm("divq %4" \
: "=a" (quo), "=d" (rem) \
: "a" (nl), "d" (nh), "r" (d))
/* Reimplementation in asm of some of the bng operations. */
static bngcarry bng_amd64_add
(bng a/*[alen]*/, bngsize alen,
bng b/*[blen]*/, bngsize blen,
bngcarry carry)
{
bngdigit tmp;
alen -= blen;
if (blen > 0) {
asm("negb %b3 \n\t"
"1: \n\t"
"movq (%0), %4 \n\t"
"adcq (%1), %4 \n\t"
"movq %4, (%0) \n\t"
"leaq 8(%0), %0 \n\t"
"leaq 8(%1), %1 \n\t"
"decq %2 \n\t"
"jnz 1b \n\t"
"setc %b3"
: "=r" (a), "=r" (b), "=r" (blen), "=q" (carry), "=r" (tmp)
: "0" (a), "1" (b), "2" (blen), "3" (carry));
}
if (carry == 0 || alen == 0) return carry;
do {
if (++(*a) != 0) return 0;
a++;
} while (--alen);
return 1;
}
static bngcarry bng_amd64_sub
(bng a/*[alen]*/, bngsize alen,
bng b/*[blen]*/, bngsize blen,
bngcarry carry)
{
bngdigit tmp;
alen -= blen;
if (blen > 0) {
asm("negb %b3 \n\t"
"1: \n\t"
"movq (%0), %4 \n\t"
"sbbq (%1), %4 \n\t"
"movq %4, (%0) \n\t"
"leaq 8(%0), %0 \n\t"
"leaq 8(%1), %1 \n\t"
"decq %2 \n\t"
"jnz 1b \n\t"
"setc %b3"
: "=r" (a), "=r" (b), "=r" (blen), "=q" (carry), "=r" (tmp)
: "0" (a), "1" (b), "2" (blen), "3" (carry));
}
if (carry == 0 || alen == 0) return carry;
do {
if ((*a)-- != 0) return 0;
a++;
} while (--alen);
return 1;
}
static bngdigit bng_amd64_mult_add_digit
(bng a/*[alen]*/, bngsize alen,
bng b/*[blen]*/, bngsize blen,
bngdigit d)
{
bngdigit out;
bngcarry carry;
alen -= blen;
out = 0;
if (blen > 0) {
asm("1: \n\t"
"movq (%1), %%rax \n\t"
"mulq %7\n\t" /* rdx:rax = d * next digit of b */
"addq (%0), %%rax \n\t" /* add next digit of a to rax */
"adcq $0, %%rdx \n\t" /* accumulate carry in rdx */
"addq %3, %%rax \n\t" /* add out to rax */
"adcq $0, %%rdx \n\t" /* accumulate carry in rdx */
"movq %%rax, (%0) \n\t" /* rax is next digit of result */
"movq %%rdx, %3 \n\t" /* rdx is next out */
"leaq 8(%0), %0 \n\t"
"leaq 8(%1), %1 \n\t"
"decq %2 \n\t"
"jnz 1b"
: "=&r" (a), "=&r" (b), "=&r" (blen), "=&r" (out)
: "0" (a), "1" (b), "2" (blen), "rm" (d), "3" (out)
: "rax", "rdx");
}
if (alen == 0) return out;
/* current digit of a += out */
BngAdd2(*a, carry, *a, out);
a++;
alen--;
/* Propagate carry */
if (carry == 0 || alen == 0) return carry;
do {
if (++(*a) != 0) return 0;
a++;
} while (--alen);
return 1;
}
static bngdigit bng_amd64_mult_sub_digit
(bng a/*[alen]*/, bngsize alen,
bng b/*[blen]*/, bngsize blen,
bngdigit d)
{
bngdigit out, tmp;
bngcarry carry;
alen -= blen;
out = 0;
if (blen > 0) {
asm("1: \n\t"
"movq (%1), %%rax \n\t"
"movq (%0), %4 \n\t"
"mulq %8\n\t" /* rdx:rax = d * next digit of b */
"subq %%rax, %4 \n\t" /* subtract rax from next digit of a */
"adcq $0, %%rdx \n\t" /* accumulate carry in rdx */
"subq %3, %4 \n\t" /* subtract out */
"adcq $0, %%rdx \n\t" /* accumulate carry in rdx */
"movq %4, (%0) \n\t" /* store next digit of result */
"movq %%rdx, %3 \n\t" /* rdx is next out */
"leaq 8(%0), %0 \n\t"
"leaq 8(%1), %1 \n\t"
"decq %2 \n\t"
"jnz 1b"
: "=&r" (a), "=&r" (b), "=&rm" (blen), "=&r" (out), "=&r" (tmp)
: "0" (a), "1" (b), "2" (blen), "rm" (d), "3" (out)
: "rax", "rdx");
}
if (alen == 0) return out;
/* current digit of a -= out */
BngSub2(*a, carry, *a, out);
a++;
alen--;
/* Propagate carry */
if (carry == 0 || alen == 0) return carry;
do {
if ((*a)-- != 0) return 0;
a++;
} while (--alen);
return 1;
}
static void bng_amd64_setup_ops(void)
{
bng_ops.add = bng_amd64_add;
bng_ops.sub = bng_amd64_sub;
bng_ops.mult_add_digit = bng_amd64_mult_add_digit;
bng_ops.mult_sub_digit = bng_amd64_mult_sub_digit;
}
#define BNG_SETUP_OPS bng_amd64_setup_ops()
|
