Introduce TLI predicative for base-relative Jump Tables.
For 64bit ABIs it is common practice to use relative Jump Tables with
potentially different relocation bases. As the logic for the jump table
itself doesn't depend on the relocation base, make it easier for targets
to use the generic logic. Start by dropping the now redundant MIPS logic.
Differential Revision: https://reviews.llvm.org/D26578
llvm-svn: 286951
diff --git a/llvm/lib/Target/Mips/MipsISelLowering.cpp b/llvm/lib/Target/Mips/MipsISelLowering.cpp
index 3b83115..783714c 100644
--- a/llvm/lib/Target/Mips/MipsISelLowering.cpp
+++ b/llvm/lib/Target/Mips/MipsISelLowering.cpp
@@ -268,7 +268,7 @@
AddPromotedToType(ISD::SETCC, MVT::i1, MVT::i32);
// Mips Custom Operations
- setOperationAction(ISD::BR_JT, MVT::Other, Custom);
+ setOperationAction(ISD::BR_JT, MVT::Other, Expand);
setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
@@ -910,7 +910,6 @@
{
switch (Op.getOpcode())
{
- case ISD::BR_JT: return lowerBR_JT(Op, DAG);
case ISD::BRCOND: return lowerBRCOND(Op, DAG);
case ISD::ConstantPool: return lowerConstantPool(Op, DAG);
case ISD::GlobalAddress: return lowerGlobalAddress(Op, DAG);
@@ -1676,40 +1675,6 @@
return BB;
}
-//===----------------------------------------------------------------------===//
-// Misc Lower Operation implementation
-//===----------------------------------------------------------------------===//
-SDValue MipsTargetLowering::lowerBR_JT(SDValue Op, SelectionDAG &DAG) const {
- SDValue Chain = Op.getOperand(0);
- SDValue Table = Op.getOperand(1);
- SDValue Index = Op.getOperand(2);
- SDLoc DL(Op);
- auto &TD = DAG.getDataLayout();
- EVT PTy = getPointerTy(TD);
- unsigned EntrySize =
- DAG.getMachineFunction().getJumpTableInfo()->getEntrySize(TD);
-
- Index = DAG.getNode(ISD::MUL, DL, PTy, Index,
- DAG.getConstant(EntrySize, DL, PTy));
- SDValue Addr = DAG.getNode(ISD::ADD, DL, PTy, Index, Table);
-
- EVT MemVT = EVT::getIntegerVT(*DAG.getContext(), EntrySize * 8);
- Addr = DAG.getExtLoad(
- ISD::SEXTLOAD, DL, PTy, Chain, Addr,
- MachinePointerInfo::getJumpTable(DAG.getMachineFunction()), MemVT);
- Chain = Addr.getValue(1);
-
- if (isPositionIndependent() || ABI.IsN64()) {
- // For PIC, the sequence is:
- // BRIND(load(Jumptable + index) + RelocBase)
- // RelocBase can be JumpTable, GOT or some sort of global base.
- Addr = DAG.getNode(ISD::ADD, DL, PTy, Addr,
- getPICJumpTableRelocBase(Table, DAG));
- }
-
- return DAG.getNode(ISD::BRIND, DL, MVT::Other, Chain, Addr);
-}
-
SDValue MipsTargetLowering::lowerBRCOND(SDValue Op, SelectionDAG &DAG) const {
// The first operand is the chain, the second is the condition, the third is
// the block to branch to if the condition is true.