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annotate src/os_cpu/linux_x86/vm/bytes_linux_x86.inline.hpp @ 13610:6537a75007e3
consider register priority in rematerialization decision
author | Erik Eckstein <erik.eckstein@oracle.com> |
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date | Mon, 13 Jan 2014 11:28:25 +0100 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef OS_CPU_LINUX_X86_VM_BYTES_LINUX_X86_INLINE_HPP |
26 #define OS_CPU_LINUX_X86_VM_BYTES_LINUX_X86_INLINE_HPP | |
27 | |
0 | 28 #include <byteswap.h> |
29 | |
30 // Efficient swapping of data bytes from Java byte | |
31 // ordering to native byte ordering and vice versa. | |
32 inline u2 Bytes::swap_u2(u2 x) { | |
33 #ifdef AMD64 | |
34 return bswap_16(x); | |
35 #else | |
36 u2 ret; | |
37 __asm__ __volatile__ ( | |
38 "movw %0, %%ax;" | |
39 "xchg %%al, %%ah;" | |
40 "movw %%ax, %0" | |
41 :"=r" (ret) // output : register 0 => ret | |
42 :"0" (x) // input : x => register 0 | |
43 :"ax", "0" // clobbered registers | |
44 ); | |
45 return ret; | |
46 #endif // AMD64 | |
47 } | |
48 | |
49 inline u4 Bytes::swap_u4(u4 x) { | |
50 #ifdef AMD64 | |
51 return bswap_32(x); | |
52 #else | |
53 u4 ret; | |
54 __asm__ __volatile__ ( | |
55 "bswap %0" | |
56 :"=r" (ret) // output : register 0 => ret | |
57 :"0" (x) // input : x => register 0 | |
58 :"0" // clobbered register | |
59 ); | |
60 return ret; | |
61 #endif // AMD64 | |
62 } | |
63 | |
64 #ifdef AMD64 | |
65 inline u8 Bytes::swap_u8(u8 x) { | |
50
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66 #ifdef SPARC_WORKS |
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67 // workaround for SunStudio12 CR6615391 |
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68 __asm__ __volatile__ ( |
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69 "bswapq %0" |
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70 :"=r" (x) // output : register 0 => x |
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71 :"0" (x) // input : x => register 0 |
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72 :"0" // clobbered register |
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73 ); |
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74 return x; |
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75 #else |
0 | 76 return bswap_64(x); |
50
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77 #endif |
0 | 78 } |
79 #else | |
80 // Helper function for swap_u8 | |
81 inline u8 Bytes::swap_u8_base(u4 x, u4 y) { | |
82 return (((u8)swap_u4(x))<<32) | swap_u4(y); | |
83 } | |
84 | |
85 inline u8 Bytes::swap_u8(u8 x) { | |
86 return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1)); | |
87 } | |
88 #endif // !AMD64 | |
1972 | 89 |
90 #endif // OS_CPU_LINUX_X86_VM_BYTES_LINUX_X86_INLINE_HPP |