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PIC jump table entries are always 32-bit. This fixes PIC jump table support on X86-64. 

llvm-svn: 30590
This commit is contained in:
Evan Cheng 2006-09-24 05:22:38 +00:00
parent 25587182f3
commit 77c0757f8b
1 changed files with 4 additions and 5 deletions
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9
llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -857,18 +857,17 @@ void SelectionDAGLowering::visitJumpTable(SelectionDAGISel::JumpTable &JT) {
MVT::ValueType PTy = TLI.getPointerTy();
assert((PTy == MVT::i32 || PTy == MVT::i64) &&
"Jump table entries are 32-bit values");
bool isPIC = TLI.getTargetMachine().getRelocationModel() == Reloc::PIC_;
// PIC jump table entries are 32-bit values.
unsigned EntrySize =
(TLI.getTargetMachine().getRelocationModel() == Reloc::PIC_)
? 4 : MVT::getSizeInBits(PTy)/8;
unsigned EntrySize = isPIC ? 4 : MVT::getSizeInBits(PTy)/8;
SDOperand Copy = DAG.getCopyFromReg(getRoot(), JT.Reg, PTy);
SDOperand IDX = DAG.getNode(ISD::MUL, PTy, Copy,
DAG.getConstant(EntrySize, PTy));
SDOperand TAB = DAG.getJumpTable(JT.JTI,PTy);
SDOperand ADD = DAG.getNode(ISD::ADD, PTy, IDX, TAB);
SDOperand LD = DAG.getLoad(PTy, Copy.getValue(1), ADD,
SDOperand LD = DAG.getLoad(isPIC ? MVT::i32 : PTy, Copy.getValue(1), ADD,
DAG.getSrcValue(0));
if (TLI.getTargetMachine().getRelocationModel() == Reloc::PIC_) {
if (isPIC) {
ADD = DAG.getNode(ISD::ADD, PTy,
((PTy != MVT::i32) ? DAG.getNode(ISD::SIGN_EXTEND, PTy, LD) : LD), TAB);
DAG.setRoot(DAG.getNode(ISD::BRIND, MVT::Other, LD.getValue(1), ADD));