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In thumb2 mode, add pc is unpredictable. Use add + mov pc instead (that is until more optimization goes in).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77364 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-07-28 20:53:24 +00:00
parent 6340632d3b
commit e7c329bf4b
6 changed files with 8 additions and 19 deletions
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9
lib/Target/ARM/ARMISelLowering.cpp
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@@ -409,7 +409,6 @@ const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
case ARMISD::tCALL: return "ARMISD::tCALL";
case ARMISD::BRCOND: return "ARMISD::BRCOND";
case ARMISD::BR_JT: return "ARMISD::BR_JT";
case ARMISD::BR2_JT: return "ARMISD::BR2_JT";
case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
case ARMISD::PIC_ADD: return "ARMISD::PIC_ADD";
case ARMISD::CMP: return "ARMISD::CMP";
@@ -1712,17 +1711,15 @@ SDValue ARMTargetLowering::LowerBR_JT(SDValue Op, SelectionDAG &DAG) {
SDValue UId = DAG.getConstant(AFI->createJumpTableUId(), PTy);
SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy);
Table = DAG.getNode(ARMISD::WrapperJT, dl, MVT::i32, JTI, UId);
Index = DAG.getNode(ISD::MUL, dl, PTy, Index, DAG.getConstant(4, PTy));
SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
if (Subtarget->isThumb2()) {
// Thumb2 uses a two-level jump. That is, it jumps into the jump table
// which does another jump to the destination. This also makes it easier
// to translate it to TBB / TBH later.
// FIXME: This might not work if the function is extremely large.
return DAG.getNode(ARMISD::BR2_JT, dl, MVT::Other, Chain, Table, Index,
JTI, UId);
return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
}
Index = DAG.getNode(ISD::MUL, dl, PTy, Index, DAG.getConstant(4, PTy));
SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
if (getTargetMachine().getRelocationModel() == Reloc::PIC_) {
Addr = DAG.getLoad((MVT)MVT::i32, dl, Chain, Addr, NULL, 0);
Chain = Addr.getValue(1);