aboutsummaryrefslogtreecommitdiff
path: root/host-utils.h
blob: 212861524f0409273fb9d852c30a17e2b120339b (plain)
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
/*
 * Utility compute operations used by translated code.
 *
 * Copyright (c) 2007 Thiemo Seufer
 * Copyright (c) 2007 Jocelyn Mayer
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "osdep.h"

#if defined(__x86_64__)
#define __HAVE_FAST_MULU64__
static always_inline void mulu64 (uint64_t *plow, uint64_t *phigh,
                                  uint64_t a, uint64_t b)
{
    __asm__ ("mul %0\n\t"
             : "=d" (*phigh), "=a" (*plow)
             : "a" (a), "0" (b));
}
#define __HAVE_FAST_MULS64__
static always_inline void muls64 (uint64_t *plow, uint64_t *phigh,
                                  int64_t a, int64_t b)
{
    __asm__ ("imul %0\n\t"
             : "=d" (*phigh), "=a" (*plow)
             : "a" (a), "0" (b));
}
#else
void muls64(uint64_t *phigh, uint64_t *plow, int64_t a, int64_t b);
void mulu64(uint64_t *phigh, uint64_t *plow, uint64_t a, uint64_t b);
#endif

/* Binary search for leading zeros.  */

static always_inline int clz32(uint32_t val)
{
#if QEMU_GNUC_PREREQ(3, 4)
    if (val)
        return __builtin_clz(val);
    else
        return 32;
#else
    int cnt = 0;

    if (!(val & 0xFFFF0000U)) {
        cnt += 16;
        val <<= 16;
    }
    if (!(val & 0xFF000000U)) {
        cnt += 8;
        val <<= 8;
    }
    if (!(val & 0xF0000000U)) {
        cnt += 4;
        val <<= 4;
    }
    if (!(val & 0xC0000000U)) {
        cnt += 2;
        val <<= 2;
    }
    if (!(val & 0x80000000U)) {
        cnt++;
        val <<= 1;
    }
    if (!(val & 0x80000000U)) {
        cnt++;
    }
    return cnt;
#endif
}

static always_inline int clo32(uint32_t val)
{
    return clz32(~val);
}

static always_inline int clz64(uint64_t val)
{
#if QEMU_GNUC_PREREQ(3, 4)
    if (val)
        return __builtin_clzll(val);
    else
        return 64;
#else
    int cnt = 0;

    if (!(val >> 32)) {
        cnt += 32;
    } else {
        val >>= 32;
    }

    return cnt + clz32(val);
#endif
}

static always_inline int clo64(uint64_t val)
{
    return clz64(~val);
}

static always_inline int ctz32(uint32_t val)
{
#if QEMU_GNUC_PREREQ(3, 4)
    if (val)
        return __builtin_ctz(val);
    else
        return 32;
#else
    int cnt;

    cnt = 0;
    if (!(val & 0x0000FFFFUL)) {
        cnt += 16;
        val >>= 16;
    }
    if (!(val & 0x000000FFUL)) {
        cnt += 8;
        val >>= 8;
    }
    if (!(val & 0x0000000FUL)) {
        cnt += 4;
        val >>= 4;
    }
    if (!(val & 0x00000003UL)) {
        cnt += 2;
        val >>= 2;
    }
    if (!(val & 0x00000001UL)) {
        cnt++;
        val >>= 1;
    }
    if (!(val & 0x00000001UL)) {
        cnt++;
    }

    return cnt;
#endif
}

static always_inline int cto32(uint32_t val)
{
    return ctz32(~val);
}

static always_inline int ctz64(uint64_t val)
{
#if QEMU_GNUC_PREREQ(3, 4)
    if (val)
        return __builtin_ctz(val);
    else
        return 64;
#else
    int cnt;

    cnt = 0;
    if (!((uint32_t)val)) {
        cnt += 32;
        val >>= 32;
    }

    return cnt + ctz32(val);
#endif
}

static always_inline int cto64(uint64_t val)
{
    return ctz64(~val);
}

static always_inline int ctpop8(uint8_t val)
{
    val = (val & 0x55) + ((val >> 1) & 0x55);
    val = (val & 0x33) + ((val >> 2) & 0x33);
    val = (val & 0x0f) + ((val >> 4) & 0x0f);

    return val;
}

static always_inline int ctpop16(uint16_t val)
{
    val = (val & 0x5555) + ((val >> 1) & 0x5555);
    val = (val & 0x3333) + ((val >> 2) & 0x3333);
    val = (val & 0x0f0f) + ((val >> 4) & 0x0f0f);
    val = (val & 0x00ff) + ((val >> 8) & 0x00ff);

    return val;
}

static always_inline int ctpop32(uint32_t val)
{
#if QEMU_GNUC_PREREQ(3, 4)
    return __builtin_popcount(val);
#else
    val = (val & 0x55555555) + ((val >>  1) & 0x55555555);
    val = (val & 0x33333333) + ((val >>  2) & 0x33333333);
    val = (val & 0x0f0f0f0f) + ((val >>  4) & 0x0f0f0f0f);
    val = (val & 0x00ff00ff) + ((val >>  8) & 0x00ff00ff);
    val = (val & 0x0000ffff) + ((val >> 16) & 0x0000ffff);

    return val;
#endif
}

static always_inline int ctpop64(uint64_t val)
{
#if QEMU_GNUC_PREREQ(3, 4)
    return __builtin_popcountll(val);
#else
    val = (val & 0x5555555555555555ULL) + ((val >>  1) & 0x5555555555555555ULL);
    val = (val & 0x3333333333333333ULL) + ((val >>  2) & 0x3333333333333333ULL);
    val = (val & 0x0f0f0f0f0f0f0f0fULL) + ((val >>  4) & 0x0f0f0f0f0f0f0f0fULL);
    val = (val & 0x00ff00ff00ff00ffULL) + ((val >>  8) & 0x00ff00ff00ff00ffULL);
    val = (val & 0x0000ffff0000ffffULL) + ((val >> 16) & 0x0000ffff0000ffffULL);
    val = (val & 0x00000000ffffffffULL) + ((val >> 32) & 0x00000000ffffffffULL);

    return val;
#endif
}