Initial implementation of 'fence' instruction, the new C++0x-style replacement for llvm.memory.barrier.

This is just a LangRef entry and reading/writing/memory representation; optimizer+codegen support coming soon.

llvm-svn: 136009

1 files changed, 24 insertions, 0 deletions

diff --git a/llvm/lib/VMCore/Instructions.cpp b/llvm/lib/VMCore/Instructions.cpp
index 6d27689ca4e..ba4dae5c29f 100644
--- a/llvm/lib/VMCore/Instructions.cpp
+++ b/llvm/lib/VMCore/Instructions.cpp
@@ -996,6 +996,26 @@ void StoreInst::setAlignment(unsigned Align) {
 }
 
 //===----------------------------------------------------------------------===//
+//                       FenceInst Implementation
+//===----------------------------------------------------------------------===//
+
+FenceInst::FenceInst(LLVMContext &C, AtomicOrdering Ordering, 
+                     SynchronizationScope SynchScope,
+                     Instruction *InsertBefore)
+  : Instruction(Type::getVoidTy(C), Fence, 0, 0, InsertBefore) {
+  setOrdering(Ordering);
+  setSynchScope(SynchScope);
+}
+
+FenceInst::FenceInst(LLVMContext &C, AtomicOrdering Ordering, 
+                     SynchronizationScope SynchScope,
+                     BasicBlock *InsertAtEnd)
+  : Instruction(Type::getVoidTy(C), Fence, 0, 0, InsertAtEnd) {
+  setOrdering(Ordering);
+  setSynchScope(SynchScope);
+}
+
+//===----------------------------------------------------------------------===//
 //                       GetElementPtrInst Implementation
 //===----------------------------------------------------------------------===//
 
@@ -3018,6 +3038,10 @@ StoreInst *StoreInst::clone_impl() const {
                        isVolatile(), getAlignment());
 }
 
+FenceInst *FenceInst::clone_impl() const {
+  return new FenceInst(getContext(), getOrdering(), getSynchScope());
+}
+
 TruncInst *TruncInst::clone_impl() const {
   return new TruncInst(getOperand(0), getType());
 }