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Add ARM codegen for indirect branches.

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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
This commit is contained in:
Bob Wilson
2009-10-30 05:45:42 +00:00
parent 0b81e19d19
commit ddb16df912
6 changed files with 23 additions and 6 deletions
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lib/Target/ARM/ARMISelLowering.cpp
+15 -6
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@@ -363,6 +363,7 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
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 @@ ARMTargetLowering::LowerReturn(SDValue Chain,
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 @@ static SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) {
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 @@ SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
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);