Add ARM codegen for indirect branches.
clang/test/CodeGen/indirect-goto.c runs! (unoptimized)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85577 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 4a482fb..773166a 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -363,6 +363,7 @@
setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
+ setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
// Use the default implementation.
setOperationAction(ISD::VASTART, MVT::Other, Custom);
@@ -1183,12 +1184,12 @@
return result;
}
-// ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
-// their target counterpart wrapped in the ARMISD::Wrapper node. Suppose N is
-// one of the above mentioned nodes. It has to be wrapped because otherwise
-// Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
-// be used to form addressing mode. These wrapped nodes will be selected
-// into MOVi.
+// ConstantPool, BlockAddress, JumpTable, GlobalAddress, and ExternalSymbol are
+// lowered as their target counterpart wrapped in the ARMISD::Wrapper
+// node. Suppose N is one of the above mentioned nodes. It has to be wrapped
+// because otherwise Select(N) returns N. So the raw TargetGlobalAddress
+// nodes, etc. can only be used to form addressing mode. These wrapped nodes
+// will be selected into MOVi.
static SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) {
EVT PtrVT = Op.getValueType();
// FIXME there is no actual debug info here
@@ -1204,6 +1205,13 @@
return DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Res);
}
+SDValue ARMTargetLowering::LowerBlockAddress(SDValue Op, SelectionDAG &DAG) {
+ DebugLoc DL = Op.getDebugLoc();
+ BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
+ SDValue Result = DAG.getBlockAddress(BA, DL, /*isTarget=*/true);
+ return DAG.getNode(ARMISD::Wrapper, DL, getPointerTy(), Result);
+}
+
// Lower ISD::GlobalTLSAddress using the "general dynamic" model
SDValue
ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
@@ -2744,6 +2752,7 @@
switch (Op.getOpcode()) {
default: llvm_unreachable("Don't know how to custom lower this!");
case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
+ case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
case ISD::GlobalAddress:
return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
LowerGlobalAddressELF(Op, DAG);