Rebased localmods in clang to 223109.

lib/CodeGen/CGStmt.cpp

 //===--- CGStmt.cpp - Emit LLVM Code from Statements ----------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This contains code to emit Stmt nodes as LLVM code.
@@ skipping 2026 matching lines @@
   bool HasSideEffect = S.isVolatile() || S.getNumOutputs() == 0;
   llvm::InlineAsm::AsmDialect AsmDialect = isa<MSAsmStmt>(&S) ?
     llvm::InlineAsm::AD_Intel : llvm::InlineAsm::AD_ATT;
   llvm::InlineAsm *IA =
     llvm::InlineAsm::get(FTy, AsmString, Constraints, HasSideEffect,
                          /* IsAlignStack */ false, AsmDialect);
   llvm::CallInst *Result = Builder.CreateCall(IA, Args);
   Result->addAttribute(llvm::AttributeSet::FunctionIndex,
                        llvm::Attribute::NoUnwind);
 
+  // @LOCALMOD-START
+  if (getTargetHooks().asmMemoryIsFence() && IA->isAsmMemory()) {
+    // Targets can ask that ``asm("":::"memory")`` be treated like
+    // ``__sync_synchronize()``.
+    Builder.CreateFence(llvm::SequentiallyConsistent);
+    Builder.CreateCall(
+        llvm::InlineAsm::get(FTy, AsmString, Constraints, HasSideEffect))->
+        addAttribute(llvm::AttributeSet::FunctionIndex,
+                     llvm::Attribute::NoUnwind);
+  }
+  // @LOCALMOD-END
+
   // Slap the source location of the inline asm into a !srcloc metadata on the
   // call.
   if (const GCCAsmStmt *gccAsmStmt = dyn_cast<GCCAsmStmt>(&S)) {
     Result->setMetadata("srcloc", getAsmSrcLocInfo(gccAsmStmt->getAsmString(),
                                                    *this));
   } else {
     // At least put the line number on MS inline asm blobs.
     auto Loc = llvm::ConstantInt::get(Int32Ty, S.getAsmLoc().getRawEncoding());
     Result->setMetadata("srcloc", llvm::MDNode::get(getLLVMContext(), Loc));
   }
@@ skipping 149 matching lines @@
   }
 
   PGO.assignRegionCounters(CD, F);
   CapturedStmtInfo->EmitBody(*this, CD->getBody());
   FinishFunction(CD->getBodyRBrace());
   PGO.emitInstrumentationData();
   PGO.destroyRegionCounters();
 
   return F;
 }