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
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148242 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index 76962e4..73efb4d 100644
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -626,12 +626,14 @@
.Case("arc_cf_code_audited", true)
// C11 features
.Case("c_alignas", LangOpts.C11)
+ .Case("c_atomic", LangOpts.C11)
.Case("c_generic_selections", LangOpts.C11)
.Case("c_static_assert", LangOpts.C11)
// C++0x features
.Case("cxx_access_control_sfinae", LangOpts.CPlusPlus0x)
.Case("cxx_alias_templates", LangOpts.CPlusPlus0x)
.Case("cxx_alignas", LangOpts.CPlusPlus0x)
+ .Case("cxx_atomic", LangOpts.CPlusPlus0x)
.Case("cxx_attributes", LangOpts.CPlusPlus0x)
.Case("cxx_auto_type", LangOpts.CPlusPlus0x)
//.Case("cxx_constexpr", false);
@@ -724,9 +726,11 @@
return llvm::StringSwitch<bool>(II->getName())
// C11 features supported by other languages as extensions.
.Case("c_alignas", true)
+ .Case("c_atomic", true)
.Case("c_generic_selections", true)
.Case("c_static_assert", true)
// C++0x features supported by other languages as extensions.
+ .Case("cxx_atomic", LangOpts.CPlusPlus)
.Case("cxx_deleted_functions", LangOpts.CPlusPlus)
.Case("cxx_explicit_conversions", LangOpts.CPlusPlus)
.Case("cxx_inline_namespaces", LangOpts.CPlusPlus)