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PIC jump table entries are always 32-bit even in 64-bit mode. 

llvm-svn: 29422
This commit is contained in:
Evan Cheng 2006-08-01 01:03:13 +00:00
parent aba76b76b1
commit 6ae6ac1216
1 changed files with 11 additions and 4 deletions
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15
llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -846,15 +846,22 @@ void SelectionDAGLowering::visitJumpTable(SelectionDAGISel::JumpTable &JT) {
// Emit the code for the jump table
MVT::ValueType PTy = TLI.getPointerTy();
unsigned PTyBytes = MVT::getSizeInBits(PTy)/8;
assert((PTy == MVT::i32 || PTy == MVT::i64) &&
"Jump table entries are 32-bit values");
// PIC jump table entries are 32-bit values.
unsigned EntrySize =
(TLI.getTargetMachine().getRelocationModel() == Reloc::PIC_)
? 4 : MVT::getSizeInBits(PTy)/8;
SDOperand Copy = DAG.getCopyFromReg(getRoot(), JT.Reg, PTy);
SDOperand IDX = DAG.getNode(ISD::MUL, PTy, Copy,
DAG.getConstant(PTyBytes, PTy));
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, DAG.getSrcValue(0));
SDOperand LD = DAG.getLoad(MVT::i32, Copy.getValue(1), ADD,
DAG.getSrcValue(0));
if (TLI.getTargetMachine().getRelocationModel() == Reloc::PIC_) {
ADD = DAG.getNode(ISD::ADD, PTy, LD.getValue(0), TAB);
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));
} else {
DAG.setRoot(DAG.getNode(ISD::BRIND, MVT::Other, LD.getValue(1), LD));