commit fee02c6c1378f7244e05157aa9b07da77061fb64
author Eli Friedman <eli.friedman@gmail.com> Mon Jul 25 23:16:38 2011 +0000
committer Eli Friedman <eli.friedman@gmail.com> Mon Jul 25 23:16:38 2011 +0000
tree 5fe5c224e99b98699f84e5fc8d0e74c70535ee25
parent 15e2d90746f8ca9f5d4b29cafc0a4493daeb54cb

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

llvm/lib/VMCore/AsmWriter.cpp

diff --git a/llvm/lib/VMCore/AsmWriter.cpp b/llvm/lib/VMCore/AsmWriter.cpp
index 1ce0447..1f8e891 100644
--- a/llvm/lib/VMCore/AsmWriter.cpp
+++ b/llvm/lib/VMCore/AsmWriter.cpp
@@ -1098,6 +1098,7 @@
 
   void writeOperand(const Value *Op, bool PrintType);
   void writeParamOperand(const Value *Operand, Attributes Attrs);
+  void writeAtomic(AtomicOrdering Ordering, SynchronizationScope SynchScope);
 
   void writeAllMDNodes();
 
@@ -1128,6 +1129,28 @@
   WriteAsOperandInternal(Out, Operand, &TypePrinter, &Machine, TheModule);
 }
 
+void AssemblyWriter::writeAtomic(AtomicOrdering Ordering,
+                                 SynchronizationScope SynchScope) {
+  if (Ordering == NotAtomic)
+    return;
+
+  switch (SynchScope) {
+  default: Out << " <bad scope " << int(SynchScope) << ">"; break;
+  case SingleThread: Out << " singlethread"; break;
+  case CrossThread: break;
+  }
+
+  switch (Ordering) {
+  default: Out << " <bad ordering " << int(Ordering) << ">"; break;
+  case Unordered: Out << " unordered"; break;
+  case Monotonic: Out << " monotonic"; break;
+  case Acquire: Out << " acquire"; break;
+  case Release: Out << " release"; break;
+  case AcquireRelease: Out << " acq_rel"; break;
+  case SequentiallyConsistent: Out << " seq_cst"; break;
+  }
+}
+
 void AssemblyWriter::writeParamOperand(const Value *Operand,
                                        Attributes Attrs) {
   if (Operand == 0) {
@@ -1883,6 +1906,8 @@
     Out << ", align " << cast<LoadInst>(I).getAlignment();
   } else if (isa<StoreInst>(I) && cast<StoreInst>(I).getAlignment()) {
     Out << ", align " << cast<StoreInst>(I).getAlignment();
+  } else if (const FenceInst *FI = dyn_cast<FenceInst>(&I)) {
+    writeAtomic(FI->getOrdering(), FI->getSynchScope());
   }
 
   // Print Metadata info.