Implement MS read/write barriers and __faststorefence intrinsic

Reviewers: hans, rnk, majnemer

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D25442

llvm-svn: 283793

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 5cbb6a2338f..f9b38fa5859 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -7612,6 +7612,17 @@ Value *CodeGenFunction::EmitX86BuiltinExpr(unsigned BuiltinID,
     Builder.CreateStore(HigherBits, HighBitsAddress);
     return Builder.CreateIntCast(MulResult, ResType, IsSigned);
   }
+
+  case X86::BI__faststorefence: {
+    return Builder.CreateFence(llvm::AtomicOrdering::SequentiallyConsistent,
+                               llvm::CrossThread);
+  }
+  case X86::BI_ReadWriteBarrier:
+  case X86::BI_ReadBarrier:
+  case X86::BI_WriteBarrier: {
+    return Builder.CreateFence(llvm::AtomicOrdering::SequentiallyConsistent,
+                               llvm::SingleThread);
+  }
   }
 }