From fa35df628a4ab331347dc448ccde573d6a7fa81d Mon Sep 17 00:00:00 2001 From: David Chisnall Date: Mon, 16 Jan 2012 17:27:18 +0000 Subject: Some improvements to the handling of C11 atomic types: - Add atomic-to/from-nonatomic cast types - Emit atomic operations for arithmetic on atomic types - Emit non-atomic stores for initialisation of atomic types, but atomic stores and loads for every other store / load - Add a __atomic_init() intrinsic which does a non-atomic store to an _Atomic() type. This is needed for the corresponding C11 stdatomic.h function. - Enables the relevant __has_feature() checks. The feature isn't 100% complete yet, but it's done enough that we want people testing it. Still to do: - Make the arithmetic operations on atomic types (e.g. Atomic(int) foo = 1; foo++;) use the correct LLVM intrinsic if one exists, not a loop with a cmpxchg. - Add a signal fence builtin - Properly set the fenv state in atomic operations on floating point values - Correctly handle things like _Atomic(_Complex double) which are too large for an atomic cmpxchg on some platforms (this requires working out what 'correctly' means in this context) - Fix the many remaining corner cases llvm-svn: 148242 --- clang/lib/Frontend/InitPreprocessor.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'clang/lib/Frontend/InitPreprocessor.cpp') diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp index c736ca3ccc5..93c99890200 100644 --- a/clang/lib/Frontend/InitPreprocessor.cpp +++ b/clang/lib/Frontend/InitPreprocessor.cpp @@ -325,6 +325,14 @@ static void InitializePredefinedMacros(const TargetInfo &TI, Builder.defineMacro("__GNUC__", "4"); Builder.defineMacro("__GXX_ABI_VERSION", "1002"); + // Define macros for the C11 / C++11 memory orderings + Builder.defineMacro("__ATOMIC_RELAXED", "0"); + Builder.defineMacro("__ATOMIC_CONSUME", "1"); + Builder.defineMacro("__ATOMIC_ACQUIRE", "2"); + Builder.defineMacro("__ATOMIC_RELEASE", "3"); + Builder.defineMacro("__ATOMIC_ACQ_REL", "4"); + Builder.defineMacro("__ATOMIC_SEQ_CST", "5"); + // As sad as it is, enough software depends on the __VERSION__ for version // checks that it is necessary to report 4.2.1 (the base GCC version we claim // compatibility with) first. -- cgit v1.2.3