Visual C++ backend for rbuild (for now just a hacked mingw backend) and related compi...
[reactos.git] / include / psdk / intrin.h.bak
1 /*
2 Compatibility <intrin.h> header for GCC -- GCC equivalents of intrinsic
3 Microsoft Visual C++ functions. Originally developed for the ReactOS
4 (<http://www.reactos.org/>) and TinyKrnl (<http://www.tinykrnl.org/>)
5 projects.
6
7 Copyright (c) 2006 KJK::Hyperion <hackbunny@reactos.com>
8
9 Permission is hereby granted, free of charge, to any person obtaining a
10 copy of this software and associated documentation files (the "Software"),
11 to deal in the Software without restriction, including without limitation
12 the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 and/or sell copies of the Software, and to permit persons to whom the
14 Software is furnished to do so, subject to the following conditions:
15
16 The above copyright notice and this permission notice shall be included in
17 all copies or substantial portions of the Software.
18
19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 DEALINGS IN THE SOFTWARE.
26 */
27
28 #ifndef KJK_INTRIN_H_
29 #define KJK_INTRIN_H_
30
31 #ifndef __GNUC__
32 #error Unsupported compiler
33 #endif
34
35 /*
36 FIXME: review all "memory" clobbers, add/remove to match Visual C++
37 behavior: some "obvious" memory barriers are not present in the Visual C++
38 implementation - e.g. __stosX; on the other hand, some memory barriers that
39 *are* present could have been missed
40 */
41
42 /*
43 NOTE: this is a *compatibility* header. Some functions may look wrong at
44 first, but they're only "as wrong" as they would be on Visual C++. Our
45 priority is compatibility
46
47 NOTE: unlike most people who write inline asm for GCC, I didn't pull the
48 constraints and the uses of __volatile__ out of my... hat. Do not touch
49 them. I hate cargo cult programming
50
51 NOTE: be very careful with declaring "memory" clobbers. Some "obvious"
52 barriers aren't there in Visual C++ (e.g. __stosX)
53
54 NOTE: review all intrinsics with a return value, add/remove __volatile__
55 where necessary. If an intrinsic whose value is ignored generates a no-op
56 under Visual C++, __volatile__ must be omitted; if it always generates code
57 (for example, if it has side effects), __volatile__ must be specified. GCC
58 will only optimize out non-volatile asm blocks with outputs, so input-only
59 blocks are safe. Oddities such as the non-volatile 'rdmsr' are intentional
60 and follow Visual C++ behavior
61
62 NOTE: on GCC 4.1.0, please use the __sync_* built-ins for barriers and
63 atomic operations. Test the version like this:
64
65 #if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100
66 ...
67
68 Pay attention to the type of barrier. Make it match with what Visual C++
69 would use in the same case
70 */
71
72 #if defined(__i386__)
73 #include "intrin_x86.h"
74 #elif defined(_PPC_)
75 #include "intrin_ppc.h"
76 #elif defined(_MIPS_)
77 #include "intrin_mips.h"
78 #elif defined(_M_ARM)
79 #include "intrin_arm.h"
80 #elif defined(__x86_64__)
81 /* TODO: the x64 architecture shares most of the i386 intrinsics. It should be easy to support */
82 #include "intrin_x86.h"
83 #else
84 #error Unsupported architecture
85 #endif
86
87
88 /*** Miscellaneous ***/
89 /* BUGBUG: only good for use in macros. Cannot be taken the address of */
90 #define __noop(...) ((void)0)
91
92 /* TODO: __assume. GCC only supports the weaker __builtin_expect */
93
94 #endif
95
96 /* EOF */