Comments on JumpTableness

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30615 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Lenharth 2006-09-26 20:02:30 +00:00
parent bb1518585b
commit 16113431e8
2 changed files with 4 additions and 0 deletions

View File

@ -2403,6 +2403,7 @@ const char *SDNode::getOperationName(const SelectionDAG *G) const {
case ISD::GlobalAddress: return "GlobalAddress";
case ISD::FrameIndex: return "FrameIndex";
case ISD::JumpTable: return "JumpTable";
case ISD::JumpTableRelocBase: return "JumpTableRelocBase";
case ISD::ConstantPool: return "ConstantPool";
case ISD::ExternalSymbol: return "ExternalSymbol";
case ISD::INTRINSIC_WO_CHAIN: {

View File

@ -868,6 +868,9 @@ void SelectionDAGLowering::visitJumpTable(SelectionDAGISel::JumpTable &JT) {
SDOperand LD = DAG.getLoad(isPIC ? MVT::i32 : PTy, Copy.getValue(1), ADD,
DAG.getSrcValue(0));
if (isPIC) {
// For Pic, the sequence is:
// BRIND(load(Jumptable + index) + RelocBase)
// RelocBase is the JumpTable on PPC and X86, GOT on Alpha
SDOperand Reloc = DAG.getNode(ISD::JumpTableRelocBase, PTy, TAB);
ADD = DAG.getNode(ISD::ADD, PTy,
((PTy != MVT::i32) ? DAG.getNode(ISD::SIGN_EXTEND, PTy, LD) : LD), Reloc);