diff options
| author | Michael J. Spencer <bigcheesegs@gmail.com> | 2013-01-02 20:14:11 +0000 |
|---|---|---|
| committer | Michael J. Spencer <bigcheesegs@gmail.com> | 2013-01-02 20:14:11 +0000 |
| commit | c8b18df9a79ddb759d6a563dd7ebd90b85ae4918 (patch) | |
| tree | 52c58ddcb2ace79bcc48f182016b9cd7587a5a42 /include/llvm/Support/Compiler.h | |
| parent | 8da72f82be858234e81e8a95bd202ab2f2bf891b (diff) | |
[Support][Endian] Add support for specifying the alignment and native unaligned types.
* Add support for specifying the alignment to use.
* Add the concept of native endianness. Used for unaligned native types.
The native alignment and read/write simplification is based on a patch by Richard Smith.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171406 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/Support/Compiler.h')
| -rw-r--r-- | include/llvm/Support/Compiler.h | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h index fce30e8b7d..c2ee882b75 100644 --- a/include/llvm/Support/Compiler.h +++ b/include/llvm/Support/Compiler.h @@ -151,7 +151,6 @@ #define LLVM_UNLIKELY(EXPR) (EXPR) #endif - // C++ doesn't support 'extern template' of template specializations. GCC does, // but requires __extension__ before it. In the header, use this: // EXTERN_TEMPLATE_INSTANTIATION(class foo<bar>); @@ -187,7 +186,6 @@ #define LLVM_ATTRIBUTE_ALWAYS_INLINE #endif - #ifdef __GNUC__ #define LLVM_ATTRIBUTE_NORETURN __attribute__((noreturn)) #elif defined(_MSC_VER) @@ -225,6 +223,10 @@ #if defined(__clang__) || (__GNUC__ > 4) \ || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5) # define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable() +#elif defined(_MSC_VER) +# define LLVM_BUILTIN_UNREACHABLE __assume(false) +#else +# define LLVM_BUILTIN_UNREACHABLE 0 #endif /// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression @@ -236,4 +238,14 @@ # define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0 #endif +/// \macro LLVM_ASSUME_ALIGNED +/// \brief Returns a pointer with an assumed alignment. +#if defined(__GNUC__) && !defined(__clang__) +// FIXME: Enable on clang when it supports it. +# define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a) +#else +# define LLVM_ASSUME_ALIGNED(p, a) \ + (((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p))) +#endif + #endif |