several major improvements to the sparc backend: support for weak linkage
and PIC codegen. Patch by Venkatraman Govindaraju!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81877 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Sparc/SparcISelDAGToDAG.cpp b/lib/Target/Sparc/SparcISelDAGToDAG.cpp
index e1b9b59..071590f 100644
--- a/lib/Target/Sparc/SparcISelDAGToDAG.cpp
+++ b/lib/Target/Sparc/SparcISelDAGToDAG.cpp
@@ -34,10 +34,13 @@
/// Subtarget - Keep a pointer to the Sparc Subtarget around so that we can
/// make the right decision when generating code for different targets.
const SparcSubtarget &Subtarget;
+ SparcTargetMachine& TM;
+ MachineBasicBlock *CurBB;
public:
- explicit SparcDAGToDAGISel(SparcTargetMachine &TM)
- : SelectionDAGISel(TM),
- Subtarget(TM.getSubtarget<SparcSubtarget>()) {
+ explicit SparcDAGToDAGISel(SparcTargetMachine &tm)
+ : SelectionDAGISel(tm),
+ Subtarget(tm.getSubtarget<SparcSubtarget>()),
+ TM(tm) {
}
SDNode *Select(SDValue Op);
@@ -63,6 +66,9 @@
// Include the pieces autogenerated from the target description.
#include "SparcGenDAGISel.inc"
+
+private:
+ SDNode* getGlobalBaseReg();
};
} // end anonymous namespace
@@ -70,12 +76,18 @@
/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
void SparcDAGToDAGISel::InstructionSelect() {
DEBUG(BB->dump());
-
+ CurBB = BB;
// Select target instructions for the DAG.
SelectRoot(*CurDAG);
CurDAG->RemoveDeadNodes();
}
+SDNode* SparcDAGToDAGISel::getGlobalBaseReg() {
+ MachineFunction *MF = CurBB->getParent();
+ unsigned GlobalBaseReg = TM.getInstrInfo()->getGlobalBaseReg(MF);
+ return CurDAG->getRegister(GlobalBaseReg, TLI.getPointerTy()).getNode();
+}
+
bool SparcDAGToDAGISel::SelectADDRri(SDValue Op, SDValue Addr,
SDValue &Base, SDValue &Offset) {
if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
@@ -149,6 +161,9 @@
switch (N->getOpcode()) {
default: break;
+ case SPISD::GLOBAL_BASE_REG:
+ return getGlobalBaseReg();
+
case ISD::SDIV:
case ISD::UDIV: {
// FIXME: should use a custom expander to expose the SRA to the dag.