Move the point at which FastISel taps into the SelectionDAGISel

process up to a higher level. This allows FastISel to leverage
more of SelectionDAGISel's infastructure, such as updating Machine
PHI nodes.

Also, implement transitioning from SDISel back to FastISel in
the middle of a block, so it's now possible to go back and
forth. This allows FastISel to hand individual CallInsts and other
complicated things off to SDISel to handle, while handling the rest
of the block itself.

To help support this, reorganize the SelectionDAG class so that it
is allocated once and reused throughout a function, instead of
being completely reallocated for each block.

llvm-svn: 55219

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp b/llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp
index ad1f63d642f..d26a5fbd34d 100644
--- a/llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp
+++ b/llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp
@@ -54,7 +54,7 @@ public:
   } 
   
   SDNode *Select(SDValue Op);
-  virtual void InstructionSelect(SelectionDAG &DAG);
+  virtual void InstructionSelect();
   bool SelectAddrMode2(SDValue Op, SDValue N, SDValue &Base,
                        SDValue &Offset, SDValue &Opc);
   bool SelectAddrMode2Offset(SDValue Op, SDValue N,
@@ -91,11 +91,11 @@ public:
 };
 }
 
-void ARMDAGToDAGISel::InstructionSelect(SelectionDAG &DAG) {
+void ARMDAGToDAGISel::InstructionSelect() {
   DEBUG(BB->dump());
 
   SelectRoot();
-  DAG.RemoveDeadNodes();
+  CurDAG->RemoveDeadNodes();
 }
 
 bool ARMDAGToDAGISel::SelectAddrMode2(SDValue Op, SDValue N,