Add support for ARM ldrexd/strexd builtins

llvm-svn: 132249

1 files changed, 35 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 9d6c20f12f0..2f4104da937 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -1186,6 +1186,41 @@ Value *CodeGenFunction::EmitARMBuiltinExpr(unsigned BuiltinID,
                               Ops.begin(), Ops.end());
   }
 
+  if (BuiltinID == ARM::BI__builtin_arm_ldrexd) {
+    Function *F = CGM.getIntrinsic(Intrinsic::arm_ldrexd);
+
+    Value *LdPtr = EmitScalarExpr(E->getArg(0));
+    Value *Val = Builder.CreateCall(F, LdPtr, "ldrexd");
+
+    Value *Val0 = Builder.CreateExtractValue(Val, 1);
+    Value *Val1 = Builder.CreateExtractValue(Val, 0);
+    Val0 = Builder.CreateZExt(Val0, Int64Ty);
+    Val1 = Builder.CreateZExt(Val1, Int64Ty);
+
+    Value *ShiftCst = llvm::ConstantInt::get(Int64Ty, 32);
+    Val = Builder.CreateShl(Val0, ShiftCst, "shl", true /* nuw */);
+    return Builder.CreateOr(Val, Val1);
+  }
+
+  if (BuiltinID == ARM::BI__builtin_arm_strexd) {
+    Function *F = CGM.getIntrinsic(Intrinsic::arm_strexd);
+    llvm::Type *STy = llvm::StructType::get(getLLVMContext(), Int32Ty, Int32Ty,
+                                            NULL);
+
+    Value *One = llvm::ConstantInt::get(Int32Ty, 1);
+    Value *Tmp = Builder.CreateAlloca(Int64Ty, One, "tmp");
+    Value *Val = EmitScalarExpr(E->getArg(0));
+    Builder.CreateStore(Val, Tmp);
+
+    Value *LdPtr = Builder.CreateBitCast(Tmp,llvm::PointerType::getUnqual(STy));
+    Val = Builder.CreateLoad(LdPtr);
+
+    Value *Arg0 = Builder.CreateExtractValue(Val, 0);
+    Value *Arg1 = Builder.CreateExtractValue(Val, 1);
+    Value *StPtr = EmitScalarExpr(E->getArg(1));
+    return Builder.CreateCall3(F, Arg0, Arg1, StPtr, "strexd");
+  }
+
   llvm::SmallVector<Value*, 4> Ops;
   for (unsigned i = 0, e = E->getNumArgs() - 1; i != e; i++)
     Ops.push_back(EmitScalarExpr(E->getArg(i)));