Mercurial > jdk8-mips64-public > hotspot / file revision
src/cpu/ppc/vm/bytes_ppc.hpp@70aa912cebe5
src/cpu/ppc/vm/bytes_ppc.hpp
Wed, 15 Apr 2020 11:49:55 +0800
- author
- aoqi
- date
- Wed, 15 Apr 2020 11:49:55 +0800
- changeset 9852
- 70aa912cebe5
- parent 6876
- 710a3c8b516e
- permissions
- -rw-r--r--
Merge
1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2012, 2013 SAP AG. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
26 #ifndef CPU_PPC_VM_BYTES_PPC_HPP
27 #define CPU_PPC_VM_BYTES_PPC_HPP
29 #include "memory/allocation.hpp"
31 class Bytes: AllStatic {
32 public:
33 // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering
34 // PowerPC needs to check for alignment.
36 // Can I count on address always being a pointer to an unsigned char? Yes.
38 #if defined(VM_LITTLE_ENDIAN)
40 // Returns true, if the byte ordering used by Java is different from the native byte ordering
41 // of the underlying machine. For example, true for Intel x86, False, for Solaris on Sparc.
42 static inline bool is_Java_byte_ordering_different() { return true; }
44 // Forward declarations of the compiler-dependent implementation
45 static inline u2 swap_u2(u2 x);
46 static inline u4 swap_u4(u4 x);
47 static inline u8 swap_u8(u8 x);
49 static inline u2 get_native_u2(address p) {
50 return (intptr_t(p) & 1) == 0
51 ? *(u2*)p
52 : ( u2(p[1]) << 8 )
53 | ( u2(p[0]) );
54 }
56 static inline u4 get_native_u4(address p) {
57 switch (intptr_t(p) & 3) {
58 case 0: return *(u4*)p;
60 case 2: return ( u4( ((u2*)p)[1] ) << 16 )
61 | ( u4( ((u2*)p)[0] ) );
63 default: return ( u4(p[3]) << 24 )
64 | ( u4(p[2]) << 16 )
65 | ( u4(p[1]) << 8 )
66 | u4(p[0]);
67 }
68 }
70 static inline u8 get_native_u8(address p) {
71 switch (intptr_t(p) & 7) {
72 case 0: return *(u8*)p;
74 case 4: return ( u8( ((u4*)p)[1] ) << 32 )
75 | ( u8( ((u4*)p)[0] ) );
77 case 2: return ( u8( ((u2*)p)[3] ) << 48 )
78 | ( u8( ((u2*)p)[2] ) << 32 )
79 | ( u8( ((u2*)p)[1] ) << 16 )
80 | ( u8( ((u2*)p)[0] ) );
82 default: return ( u8(p[7]) << 56 )
83 | ( u8(p[6]) << 48 )
84 | ( u8(p[5]) << 40 )
85 | ( u8(p[4]) << 32 )
86 | ( u8(p[3]) << 24 )
87 | ( u8(p[2]) << 16 )
88 | ( u8(p[1]) << 8 )
89 | u8(p[0]);
90 }
91 }
95 static inline void put_native_u2(address p, u2 x) {
96 if ( (intptr_t(p) & 1) == 0 ) *(u2*)p = x;
97 else {
98 p[1] = x >> 8;
99 p[0] = x;
100 }
101 }
103 static inline void put_native_u4(address p, u4 x) {
104 switch ( intptr_t(p) & 3 ) {
105 case 0: *(u4*)p = x;
106 break;
108 case 2: ((u2*)p)[1] = x >> 16;
109 ((u2*)p)[0] = x;
110 break;
112 default: ((u1*)p)[3] = x >> 24;
113 ((u1*)p)[2] = x >> 16;
114 ((u1*)p)[1] = x >> 8;
115 ((u1*)p)[0] = x;
116 break;
117 }
118 }
120 static inline void put_native_u8(address p, u8 x) {
121 switch ( intptr_t(p) & 7 ) {
122 case 0: *(u8*)p = x;
123 break;
125 case 4: ((u4*)p)[1] = x >> 32;
126 ((u4*)p)[0] = x;
127 break;
129 case 2: ((u2*)p)[3] = x >> 48;
130 ((u2*)p)[2] = x >> 32;
131 ((u2*)p)[1] = x >> 16;
132 ((u2*)p)[0] = x;
133 break;
135 default: ((u1*)p)[7] = x >> 56;
136 ((u1*)p)[6] = x >> 48;
137 ((u1*)p)[5] = x >> 40;
138 ((u1*)p)[4] = x >> 32;
139 ((u1*)p)[3] = x >> 24;
140 ((u1*)p)[2] = x >> 16;
141 ((u1*)p)[1] = x >> 8;
142 ((u1*)p)[0] = x;
143 }
144 }
146 // Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering)
147 // (no byte-order reversal is needed since Power CPUs are big-endian oriented).
148 static inline u2 get_Java_u2(address p) { return swap_u2(get_native_u2(p)); }
149 static inline u4 get_Java_u4(address p) { return swap_u4(get_native_u4(p)); }
150 static inline u8 get_Java_u8(address p) { return swap_u8(get_native_u8(p)); }
152 static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, swap_u2(x)); }
153 static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, swap_u4(x)); }
154 static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, swap_u8(x)); }
156 #else // !defined(VM_LITTLE_ENDIAN)
158 // Returns true, if the byte ordering used by Java is different from the nativ byte ordering
159 // of the underlying machine. For example, true for Intel x86, False, for Solaris on Sparc.
160 static inline bool is_Java_byte_ordering_different() { return false; }
162 // Thus, a swap between native and Java ordering is always a no-op:
163 static inline u2 swap_u2(u2 x) { return x; }
164 static inline u4 swap_u4(u4 x) { return x; }
165 static inline u8 swap_u8(u8 x) { return x; }
167 static inline u2 get_native_u2(address p) {
168 return (intptr_t(p) & 1) == 0
169 ? *(u2*)p
170 : ( u2(p[0]) << 8 )
171 | ( u2(p[1]) );
172 }
174 static inline u4 get_native_u4(address p) {
175 switch (intptr_t(p) & 3) {
176 case 0: return *(u4*)p;
178 case 2: return ( u4( ((u2*)p)[0] ) << 16 )
179 | ( u4( ((u2*)p)[1] ) );
181 default: return ( u4(p[0]) << 24 )
182 | ( u4(p[1]) << 16 )
183 | ( u4(p[2]) << 8 )
184 | u4(p[3]);
185 }
186 }
188 static inline u8 get_native_u8(address p) {
189 switch (intptr_t(p) & 7) {
190 case 0: return *(u8*)p;
192 case 4: return ( u8( ((u4*)p)[0] ) << 32 )
193 | ( u8( ((u4*)p)[1] ) );
195 case 2: return ( u8( ((u2*)p)[0] ) << 48 )
196 | ( u8( ((u2*)p)[1] ) << 32 )
197 | ( u8( ((u2*)p)[2] ) << 16 )
198 | ( u8( ((u2*)p)[3] ) );
200 default: return ( u8(p[0]) << 56 )
201 | ( u8(p[1]) << 48 )
202 | ( u8(p[2]) << 40 )
203 | ( u8(p[3]) << 32 )
204 | ( u8(p[4]) << 24 )
205 | ( u8(p[5]) << 16 )
206 | ( u8(p[6]) << 8 )
207 | u8(p[7]);
208 }
209 }
213 static inline void put_native_u2(address p, u2 x) {
214 if ( (intptr_t(p) & 1) == 0 ) { *(u2*)p = x; }
215 else {
216 p[0] = x >> 8;
217 p[1] = x;
218 }
219 }
221 static inline void put_native_u4(address p, u4 x) {
222 switch ( intptr_t(p) & 3 ) {
223 case 0: *(u4*)p = x;
224 break;
226 case 2: ((u2*)p)[0] = x >> 16;
227 ((u2*)p)[1] = x;
228 break;
230 default: ((u1*)p)[0] = x >> 24;
231 ((u1*)p)[1] = x >> 16;
232 ((u1*)p)[2] = x >> 8;
233 ((u1*)p)[3] = x;
234 break;
235 }
236 }
238 static inline void put_native_u8(address p, u8 x) {
239 switch ( intptr_t(p) & 7 ) {
240 case 0: *(u8*)p = x;
241 break;
243 case 4: ((u4*)p)[0] = x >> 32;
244 ((u4*)p)[1] = x;
245 break;
247 case 2: ((u2*)p)[0] = x >> 48;
248 ((u2*)p)[1] = x >> 32;
249 ((u2*)p)[2] = x >> 16;
250 ((u2*)p)[3] = x;
251 break;
253 default: ((u1*)p)[0] = x >> 56;
254 ((u1*)p)[1] = x >> 48;
255 ((u1*)p)[2] = x >> 40;
256 ((u1*)p)[3] = x >> 32;
257 ((u1*)p)[4] = x >> 24;
258 ((u1*)p)[5] = x >> 16;
259 ((u1*)p)[6] = x >> 8;
260 ((u1*)p)[7] = x;
261 }
262 }
264 // Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering)
265 // (no byte-order reversal is needed since Power CPUs are big-endian oriented).
266 static inline u2 get_Java_u2(address p) { return get_native_u2(p); }
267 static inline u4 get_Java_u4(address p) { return get_native_u4(p); }
268 static inline u8 get_Java_u8(address p) { return get_native_u8(p); }
270 static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, x); }
271 static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, x); }
272 static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, x); }
274 #endif // VM_LITTLE_ENDIAN
275 };
277 #if defined(TARGET_OS_ARCH_linux_ppc)
278 #include "bytes_linux_ppc.inline.hpp"
279 #endif
281 #endif // CPU_PPC_VM_BYTES_PPC_HPP
