From: Mandeep Singh Grang <mgrang@codeaurora.org>
Date: Wed, 3 Oct 2018 17:24:21 +0000 (+0000)
Subject: [COFF, ARM64] Add _ReadWriteBarrier intrinsic
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e7b6bef4cb5d4768e681f9e44dd62f77652ad586;p=clang

[COFF, ARM64] Add _ReadWriteBarrier intrinsic

Reviewers: rnk, mstorsjo, compnerd, TomTan, haripul, javed.absar

Reviewed By: rnk

Subscribers: kristof.beyls, chrib, jfb, cfe-commits

Differential Revision: https://reviews.llvm.org/D52809

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@343699 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/Basic/BuiltinsAArch64.def b/include/clang/Basic/BuiltinsAArch64.def
index b5d971d0bc..4c46f50a8d 100644
--- a/include/clang/Basic/BuiltinsAArch64.def
+++ b/include/clang/Basic/BuiltinsAArch64.def
@@ -103,6 +103,8 @@ TARGET_HEADER_BUILTIN(_InterlockedIncrement64,   "LLiLLiD*",    "nh", "intrin.h"
 TARGET_HEADER_BUILTIN(_InterlockedOr64,          "LLiLLiD*LLi", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
 TARGET_HEADER_BUILTIN(_InterlockedXor64,         "LLiLLiD*LLi", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
 
+TARGET_HEADER_BUILTIN(_ReadWriteBarrier, "v", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
+
 #undef BUILTIN
 #undef LANGBUILTIN
 #undef TARGET_HEADER_BUILTIN
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index df71dbb4b4..49c2b126dd 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -6581,6 +6581,10 @@ Value *CodeGenFunction::EmitAArch64BuiltinExpr(unsigned BuiltinID,
     return Builder.CreateCall(F);
   }
 
+  if (BuiltinID == AArch64::BI_ReadWriteBarrier)
+    return Builder.CreateFence(llvm::AtomicOrdering::SequentiallyConsistent,
+                               llvm::SyncScope::SingleThread);
+
   // CRC32
   Intrinsic::ID CRCIntrinsicID = Intrinsic::not_intrinsic;
   switch (BuiltinID) {
diff --git a/test/CodeGen/arm64-microsoft-intrinsics.c b/test/CodeGen/arm64-microsoft-intrinsics.c
index 2dbf1f9ea0..d29e9305cc 100644
--- a/test/CodeGen/arm64-microsoft-intrinsics.c
+++ b/test/CodeGen/arm64-microsoft-intrinsics.c
@@ -59,3 +59,10 @@ void check__sevl(void) {
 
 // CHECK-MSVC: @llvm.aarch64.hint(i32 5)
 // CHECK-LINUX: error: implicit declaration of function '__sevl'
+
+void check_ReadWriteBarrier() {
+  _ReadWriteBarrier();
+}
+
+// CHECK-MSVC: fence syncscope("singlethread")
+// CHECK-LINUX: error: implicit declaration of function '_ReadWriteBarrier'