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| author | Michael J. Spencer <bigcheesegs@gmail.com> | 2013-02-03 10:48:31 +0000 |
|---|---|---|
| committer | Michael J. Spencer <bigcheesegs@gmail.com> | 2013-02-03 10:48:31 +0000 |
| commit | d9d2f187759d0154574657c195068d367c338473 (patch) | |
| tree | 5b467a7f84e18ccf93fceccc6ed4ef210ea3de94 /include/llvm/Support/Compiler.h | |
| parent | fa987f08fb237e61e4f542572535546d92838b4f (diff) | |
[Support] Add LLVM_IS_UNALIGNED_ACCESS_FAST.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174271 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/Support/Compiler.h')
| -rw-r--r-- | include/llvm/Support/Compiler.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h index 36539f6d34..6ca86bdd50 100644 --- a/include/llvm/Support/Compiler.h +++ b/include/llvm/Support/Compiler.h @@ -311,4 +311,17 @@ # define LLVM_MEMORY_SANITIZER_BUILD 0 #endif +/// \macro LLVM_IS_UNALIGNED_ACCESS_FAST +/// \brief Is unaligned memory access fast on the host machine. +/// +/// Don't specialize on alignment for platforms where unaligned memory accesses +/// generates the same code as aligned memory accesses for common types. +#if defined(_M_AMD64) || defined(_M_IX86) || defined(__amd64) || \ + defined(__amd64__) || defined(__x86_64) || defined(__x86_64__) || \ + defined(_X86_) || defined(__i386) || defined(__i386__) +# define LLVM_IS_UNALIGNED_ACCESS_FAST 1 +#else +# define LLVM_IS_UNALIGNED_ACCESS_FAST 0 +#endif + #endif |