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Re-apply fixed "[Attributor] Fix: Make sure we set the changed flag" 

This reverts commit cedd0d9a6e.

Re-apply the original commit but make sure the variables are initialized
(even if they are not used) so UBSan is not complaining.

llvm-svn: 369294
This commit is contained in:
Johannes Doerfert 2019-08-19 19:14:10 +00:00
parent 0f4e9835c9
commit 056f1b5cc7
1 changed files with 4 additions and 4 deletions
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8
llvm/lib/Transforms/IPO/Attributor.cpp
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@ -878,7 +878,7 @@ ChangeStatus AAReturnedValuesImpl::updateImpl(Attributor &A) {
// The map in which we collect return values -> return instrs.
decltype(ReturnedValues) &RetValsMap;
// The flag to indicate a change.
bool Changed;
bool &Changed;
// The return instrs we come from.
SmallPtrSet<ReturnInst *, 2> RetInsts;
};
@ -906,9 +906,8 @@ ChangeStatus AAReturnedValuesImpl::updateImpl(Attributor &A) {
// Callback for all "return intructions" live in the associated function.
auto CheckReturnInst = [this, &VisitReturnedValue, &Changed](Instruction &I) {
ReturnInst &Ret = cast<ReturnInst>(I);
RVState RVS({ReturnedValues, false, {}});
RVState RVS({ReturnedValues, Changed, {}});
RVS.RetInsts.insert(&Ret);
Changed |= RVS.Changed;
return VisitReturnedValue(*Ret.getReturnValue(), RVS);
};
@ -955,7 +954,8 @@ ChangeStatus AAReturnedValuesImpl::updateImpl(Attributor &A) {
if (Argument *Arg = dyn_cast<Argument>(RetVal)) {
// Arguments are mapped to call site operands and we begin the traversal
// again.
RVState RVS({NewRVsMap, false, RetValAAIt.second});
bool Unused = false;
RVState RVS({NewRVsMap, Unused, RetValAAIt.second});
VisitReturnedValue(*CB->getArgOperand(Arg->getArgNo()), RVS);
continue;
} else if (isa<CallBase>(RetVal)) {