VirtualBox

source: vbox/trunk/src/recompiler/host-utils.h@ 24907

最後變更 在這個檔案從24907是 17040,由 vboxsync 提交於 16 年 前

recompiler_new: svn properties.

  • 屬性 svn:eol-style 設為 native
檔案大小: 6.4 KB
 
1/*
2 * Utility compute operations used by translated code.
3 *
4 * Copyright (c) 2007 Thiemo Seufer
5 * Copyright (c) 2007 Jocelyn Mayer
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25
26#include "osdep.h"
27
28#if defined(__x86_64__)
29#define __HAVE_FAST_MULU64__
30static always_inline void mulu64 (uint64_t *plow, uint64_t *phigh,
31 uint64_t a, uint64_t b)
32{
33 __asm__ ("mul %0\n\t"
34 : "=d" (*phigh), "=a" (*plow)
35 : "a" (a), "0" (b));
36}
37#define __HAVE_FAST_MULS64__
38static always_inline void muls64 (uint64_t *plow, uint64_t *phigh,
39 int64_t a, int64_t b)
40{
41 __asm__ ("imul %0\n\t"
42 : "=d" (*phigh), "=a" (*plow)
43 : "a" (a), "0" (b));
44}
45#else
46void muls64(uint64_t *phigh, uint64_t *plow, int64_t a, int64_t b);
47void mulu64(uint64_t *phigh, uint64_t *plow, uint64_t a, uint64_t b);
48#endif
49
50/* Binary search for leading zeros. */
51
52#ifndef VBOX
53static always_inline int clz32(uint32_t val)
54#else
55DECLALWAYSINLINE(int) clz32(uint32_t val)
56#endif
57{
58#if QEMU_GNUC_PREREQ(3, 4)
59 if (val)
60 return __builtin_clz(val);
61 else
62 return 32;
63#else
64 int cnt = 0;
65
66 if (!(val & 0xFFFF0000U)) {
67 cnt += 16;
68 val <<= 16;
69 }
70 if (!(val & 0xFF000000U)) {
71 cnt += 8;
72 val <<= 8;
73 }
74 if (!(val & 0xF0000000U)) {
75 cnt += 4;
76 val <<= 4;
77 }
78 if (!(val & 0xC0000000U)) {
79 cnt += 2;
80 val <<= 2;
81 }
82 if (!(val & 0x80000000U)) {
83 cnt++;
84 val <<= 1;
85 }
86 if (!(val & 0x80000000U)) {
87 cnt++;
88 }
89 return cnt;
90#endif
91}
92
93#ifndef VBOX
94static always_inline int clo32(uint32_t val)
95#else
96DECLALWAYSINLINE(int) clo32(uint32_t val)
97#endif
98{
99 return clz32(~val);
100}
101
102#ifndef VBOX
103static always_inline int clz64(uint64_t val)
104#else
105DECLALWAYSINLINE(int) clz64(uint64_t val)
106#endif
107{
108#if QEMU_GNUC_PREREQ(3, 4)
109 if (val)
110 return __builtin_clzll(val);
111 else
112 return 64;
113#else
114 int cnt = 0;
115
116 if (!(val >> 32)) {
117 cnt += 32;
118 } else {
119 val >>= 32;
120 }
121
122 return cnt + clz32(val);
123#endif
124}
125
126#ifndef VBOX
127static always_inline int clo64(uint64_t val)
128#else
129DECLALWAYSINLINE(int) clo64(uint64_t val)
130#endif
131{
132 return clz64(~val);
133}
134
135#ifndef VBOX
136static always_inline int ctz32 (uint32_t val)
137#else
138DECLALWAYSINLINE(int) ctz32 (uint32_t val)
139#endif
140{
141#if QEMU_GNUC_PREREQ(3, 4)
142 if (val)
143 return __builtin_ctz(val);
144 else
145 return 32;
146#else
147 int cnt;
148
149 cnt = 0;
150 if (!(val & 0x0000FFFFUL)) {
151 cnt += 16;
152 val >>= 16;
153 }
154 if (!(val & 0x000000FFUL)) {
155 cnt += 8;
156 val >>= 8;
157 }
158 if (!(val & 0x0000000FUL)) {
159 cnt += 4;
160 val >>= 4;
161 }
162 if (!(val & 0x00000003UL)) {
163 cnt += 2;
164 val >>= 2;
165 }
166 if (!(val & 0x00000001UL)) {
167 cnt++;
168 val >>= 1;
169 }
170 if (!(val & 0x00000001UL)) {
171 cnt++;
172 }
173
174 return cnt;
175#endif
176 }
177
178#ifndef VBOX
179static always_inline int cto32 (uint32_t val)
180#else
181DECLALWAYSINLINE(int) cto32 (uint32_t val)
182#endif
183{
184 return ctz32(~val);
185}
186
187#ifndef VBOX
188static always_inline int ctz64 (uint64_t val)
189#else
190DECLALWAYSINLINE(int) ctz64 (uint64_t val)
191#endif
192{
193#if QEMU_GNUC_PREREQ(3, 4)
194 if (val)
195 return __builtin_ctz(val);
196 else
197 return 64;
198#else
199 int cnt;
200
201 cnt = 0;
202 if (!((uint32_t)val)) {
203 cnt += 32;
204 val >>= 32;
205 }
206
207 return cnt + ctz32(val);
208#endif
209}
210
211#ifndef VBOX
212static always_inline int cto64 (uint64_t val)
213#else
214DECLALWAYSINLINE(int) cto64 (uint64_t val)
215#endif
216{
217 return ctz64(~val);
218}
219
220#ifndef VBOX
221static always_inline int ctpop8 (uint8_t val)
222#else
223DECLALWAYSINLINE(int) ctpop8 (uint8_t val)
224#endif
225{
226 val = (val & 0x55) + ((val >> 1) & 0x55);
227 val = (val & 0x33) + ((val >> 2) & 0x33);
228 val = (val & 0x0f) + ((val >> 4) & 0x0f);
229
230 return val;
231}
232
233#ifndef VBOX
234static always_inline int ctpop16 (uint16_t val)
235#else
236DECLALWAYSINLINE(int) ctpop16 (uint16_t val)
237#endif
238{
239 val = (val & 0x5555) + ((val >> 1) & 0x5555);
240 val = (val & 0x3333) + ((val >> 2) & 0x3333);
241 val = (val & 0x0f0f) + ((val >> 4) & 0x0f0f);
242 val = (val & 0x00ff) + ((val >> 8) & 0x00ff);
243
244 return val;
245}
246
247#ifndef VBOX
248static always_inline int ctpop32 (uint32_t val)
249#else
250DECLALWAYSINLINE(int) ctpop32 (uint32_t val)
251#endif
252{
253#if QEMU_GNUC_PREREQ(3, 4)
254 return __builtin_popcount(val);
255#else
256 val = (val & 0x55555555) + ((val >> 1) & 0x55555555);
257 val = (val & 0x33333333) + ((val >> 2) & 0x33333333);
258 val = (val & 0x0f0f0f0f) + ((val >> 4) & 0x0f0f0f0f);
259 val = (val & 0x00ff00ff) + ((val >> 8) & 0x00ff00ff);
260 val = (val & 0x0000ffff) + ((val >> 16) & 0x0000ffff);
261
262 return val;
263#endif
264}
265
266#ifndef VBOX
267static always_inline int ctpop64 (uint64_t val)
268#else
269DECLALWAYSINLINE(int) ctpop64 (uint64_t val)
270#endif
271{
272#if QEMU_GNUC_PREREQ(3, 4)
273 return __builtin_popcountll(val);
274#else
275 val = (val & 0x5555555555555555ULL) + ((val >> 1) & 0x5555555555555555ULL);
276 val = (val & 0x3333333333333333ULL) + ((val >> 2) & 0x3333333333333333ULL);
277 val = (val & 0x0f0f0f0f0f0f0f0fULL) + ((val >> 4) & 0x0f0f0f0f0f0f0f0fULL);
278 val = (val & 0x00ff00ff00ff00ffULL) + ((val >> 8) & 0x00ff00ff00ff00ffULL);
279 val = (val & 0x0000ffff0000ffffULL) + ((val >> 16) & 0x0000ffff0000ffffULL);
280 val = (val & 0x00000000ffffffffULL) + ((val >> 32) & 0x00000000ffffffffULL);
281
282 return val;
283#endif
284}
注意: 瀏覽 TracBrowser 來幫助您使用儲存庫瀏覽器

© 2024 Oracle Support Privacy / Do Not Sell My Info Terms of Use Trademark Policy Automated Access Etiquette