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
diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index e55732a..0c13951 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -2029,13 +2029,14 @@
/// the LLVM value representation.
void EmitStoreOfScalar(llvm::Value *Value, llvm::Value *Addr,
bool Volatile, unsigned Alignment, QualType Ty,
- llvm::MDNode *TBAAInfo = 0);
+ llvm::MDNode *TBAAInfo = 0, bool isInit=false);
/// EmitStoreOfScalar - Store a scalar value to an address, taking
/// care to appropriately convert from the memory representation to
/// the LLVM value representation. The l-value must be a simple
- /// l-value.
- void EmitStoreOfScalar(llvm::Value *value, LValue lvalue);
+ /// l-value. The isInit flag indicates whether this is an initialization.
+ /// If so, atomic qualifiers are ignored and the store is always non-atomic.
+ void EmitStoreOfScalar(llvm::Value *value, LValue lvalue, bool isInit=false);
/// EmitLoadOfLValue - Given an expression that represents a value lvalue,
/// this method emits the address of the lvalue, then loads the result as an
@@ -2047,7 +2048,7 @@
/// EmitStoreThroughLValue - Store the specified rvalue into the specified
/// lvalue, where both are guaranteed to the have the same type, and that type
/// is 'Ty'.
- void EmitStoreThroughLValue(RValue Src, LValue Dst);
+ void EmitStoreThroughLValue(RValue Src, LValue Dst, bool isInit=false);
void EmitStoreThroughExtVectorComponentLValue(RValue Src, LValue Dst);
/// EmitStoreThroughLValue - Store Src into Dst with same constraints as