Rearrange handling of jump tables. Highlights:

1. MachineJumpTableInfo is now created lazily for a function the first time
   it actually makes a jump table instead of for every function.
2. The encoding of jump table entries is now described by the
   MachineJumpTableInfo::JTEntryKind enum.  This enum is determined by the
   TLI::getJumpTableEncoding() hook, instead of by lots of code scattered
   throughout the compiler that "knows" that jump table entries are always
   32-bits in pic mode (for example).
3. The size and alignment of jump table entries is now calculated based on
   their kind, instead of at machinefunction creation time.

Future work includes using the EntryKind in more places in the compiler,
eliminating other logic that "knows" the layout of jump tables in various
situations.

llvm-svn: 94470

1 files changed, 6 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 1c83869d774..12a4b31e5bf 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -2816,9 +2816,12 @@ void SelectionDAGLegalize::ExpandNode(SDNode *Node,
     SDValue Index = Node->getOperand(2);
 
     EVT PTy = TLI.getPointerTy();
-    MachineFunction &MF = DAG.getMachineFunction();
-    unsigned EntrySize = MF.getJumpTableInfo()->getEntrySize();
-    Index= DAG.getNode(ISD::MUL, dl, PTy,
+
+    const TargetData &TD = *TLI.getTargetData();
+    unsigned EntrySize =
+      DAG.getMachineFunction().getJumpTableInfo()->getEntrySize(TD);
+    
+    Index = DAG.getNode(ISD::MUL, dl, PTy,
                         Index, DAG.getConstant(EntrySize, PTy));
     SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);