1 /* 2 Compatibility <intrin.h> header for GCC -- GCC equivalents of intrinsic 3 Microsoft Visual C++ functions. Originally developed for the ReactOS 4 (<https://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 RC_INVOKED 32 33 #ifndef _SIZE_T_DEFINED 34 #define _SIZE_T_DEFINED 35 #ifdef _WIN64 36 typedef unsigned __int64 size_t; 37 #else 38 typedef unsigned int size_t; 39 #endif 40 #endif 41 42 #ifndef _UINTPTR_T_DEFINED 43 #define _UINTPTR_T_DEFINED 44 #ifdef _WIN64 45 typedef unsigned __int64 uintptr_t; 46 #else 47 typedef unsigned int uintptr_t; 48 #endif 49 #endif 50 51 /* 52 FIXME: review all "memory" clobbers, add/remove to match Visual C++ 53 behavior: some "obvious" memory barriers are not present in the Visual C++ 54 implementation - e.g. __stosX; on the other hand, some memory barriers that 55 *are* present could have been missed 56 */ 57 58 /* 59 NOTE: this is a *compatibility* header. Some functions may look wrong at 60 first, but they're only "as wrong" as they would be on Visual C++. Our 61 priority is compatibility 62 63 NOTE: unlike most people who write inline asm for GCC, I didn't pull the 64 constraints and the uses of __volatile__ out of my... hat. Do not touch 65 them. I hate cargo cult programming 66 67 NOTE: be very careful with declaring "memory" clobbers. Some "obvious" 68 barriers aren't there in Visual C++ (e.g. __stosX) 69 70 NOTE: review all intrinsics with a return value, add/remove __volatile__ 71 where necessary. If an intrinsic whose value is ignored generates a no-op 72 under Visual C++, __volatile__ must be omitted; if it always generates code 73 (for example, if it has side effects), __volatile__ must be specified. GCC 74 will only optimize out non-volatile asm blocks with outputs, so input-only 75 blocks are safe. Oddities such as the non-volatile 'rdmsr' are intentional 76 and follow Visual C++ behavior 77 78 NOTE: on GCC 4.1.0, please use the __sync_* built-ins for barriers and 79 atomic operations. Test the version like this: 80 81 #if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100 82 ... 83 84 Pay attention to the type of barrier. Make it match with what Visual C++ 85 would use in the same case 86 */ 87 88 #if defined(__i386__) 89 #include "intrin_x86.h" 90 #elif defined(_PPC_) 91 #include "intrin_ppc.h" 92 #elif defined(_MIPS_) 93 #include "intrin_mips.h" 94 #elif defined(_M_ARM) 95 #include "intrin_arm.h" 96 #elif defined(__x86_64__) 97 /* TODO: the x64 architecture shares most of the i386 intrinsics. It should be easy to support */ 98 #include "intrin_x86.h" 99 #else 100 #error Unsupported architecture 101 #endif 102 103 104 /*** Miscellaneous ***/ 105 /* BUGBUG: only good for use in macros. Cannot be taken the address of */ 106 #define __noop(...) ((void)0) 107 108 #define __assume(x) if (!(x)) __builtin_unreachable() 109 110 #endif 111 112 #endif 113 114 /* EOF */ 115