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Preserve debug info for unused zero extended boolean argument.

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Radar 9422775.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131422 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2011-05-16 21:24:05 +00:00
parent cacdc4fc41
commit 227dfdb3c4
2 changed files with 40 additions and 10 deletions
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33
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
View File

@ -4026,6 +4026,24 @@ static SDValue ExpandPowI(DebugLoc DL, SDValue LHS, SDValue RHS,
return DAG.getNode(ISD::FPOWI, DL, LHS.getValueType(), LHS, RHS);
}
// getTruncatedArgReg - Find underlying register used for an truncated
// argument.
static unsigned getTruncatedArgReg(const SDValue &N) {
if (N.getOpcode() != ISD::TRUNCATE)
return 0;
const SDValue &Ext = N.getOperand(0);
if (Ext.getOpcode() == ISD::AssertZext || Ext.getOpcode() == ISD::AssertSext){
const SDValue &CFR = Ext.getOperand(0);
if (CFR.getOpcode() == ISD::CopyFromReg)
return cast<RegisterSDNode>(CFR.getOperand(1))->getReg();
else
if (CFR.getOpcode() == ISD::TRUNCATE)
return getTruncatedArgReg(CFR);
}
return 0;
}
/// EmitFuncArgumentDbgValue - If the DbgValueInst is a dbg_value of a function
/// argument, create the corresponding DBG_VALUE machine instruction for it now.
/// At the end of instruction selection, they will be inserted to the entry BB.
@ -4057,9 +4075,12 @@ SelectionDAGBuilder::EmitFuncArgumentDbgValue(const Value *V, MDNode *Variable,
Reg = 0;
}
if (N.getNode() && N.getOpcode() == ISD::CopyFromReg) {
Reg = cast<RegisterSDNode>(N.getOperand(1))->getReg();
if (TargetRegisterInfo::isVirtualRegister(Reg)) {
if (N.getNode()) {
if (N.getOpcode() == ISD::CopyFromReg)
Reg = cast<RegisterSDNode>(N.getOperand(1))->getReg();
else
Reg = getTruncatedArgReg(N);
if (Reg && TargetRegisterInfo::isVirtualRegister(Reg)) {
MachineRegisterInfo &RegInfo = MF.getRegInfo();
unsigned PR = RegInfo.getLiveInPhysReg(Reg);
if (PR)
@ -4221,9 +4242,9 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
SDV = DAG.getDbgValue(Variable, FINode->getIndex(),
0, dl, SDNodeOrder);
else {
// Can't do anything with other non-AI cases yet. This might be a
// parameter of a callee function that got inlined, for example.
DEBUG(dbgs() << "Dropping debug info for " << DI);
// Address is an argument, so try to emit its dbg value using
// virtual register info from the FuncInfo.ValueMap.
EmitFuncArgumentDbgValue(Address, Variable, 0, N);
return 0;
}
} else if (AI)

15
lib/Transforms/Utils/Local.cpp
View File

@ -785,9 +785,18 @@ bool llvm::ConvertDebugDeclareToDebugValue(DbgDeclareInst *DDI,
if (!DIVar.Verify())
return false;
Instruction *DbgVal =
Builder.insertDbgValueIntrinsic(SI->getOperand(0), 0,
DIVar, SI);
Instruction *DbgVal = NULL;
// If an argument is zero extended then use argument directly. The ZExt
// may be zapped by an optimization pass in future.
Argument *ExtendedArg = NULL;
if (ZExtInst *ZExt = dyn_cast<ZExtInst>(SI->getOperand(0)))
ExtendedArg = dyn_cast<Argument>(ZExt->getOperand(0));
if (SExtInst *SExt = dyn_cast<SExtInst>(SI->getOperand(0)))
ExtendedArg = dyn_cast<Argument>(SExt->getOperand(0));
if (ExtendedArg)
DbgVal = Builder.insertDbgValueIntrinsic(ExtendedArg, 0, DIVar, SI);
else
DbgVal = Builder.insertDbgValueIntrinsic(SI->getOperand(0), 0, DIVar, SI);
// Propagate any debug metadata from the store onto the dbg.value.
DebugLoc SIDL = SI->getDebugLoc();