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[SelectionDAG] Don't create entries in ValueMap in ComputePHILiveOutRegInfo 

Instead of using operator[], use DenseMap::find to prevent default
constructing an entry if it isn't already in the map.

Also simplify a condition to check for 0 instead of a virtual register.
I'm pretty sure we can only get 0 or a virtual register out of the value
map.
This commit is contained in:
Craig Topper 2022-03-23 09:28:46 -07:00
parent b38e78cc44
commit cac9773dcc
1 changed files with 7 additions and 2 deletions
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9
llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
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@ -445,9 +445,14 @@ void FunctionLoweringInfo::ComputePHILiveOutRegInfo(const PHINode *PN) {
IntVT = TLI->getTypeToTransformTo(PN->getContext(), IntVT);
unsigned BitWidth = IntVT.getSizeInBits();
Register DestReg = ValueMap[PN];
if (!Register::isVirtualRegister(DestReg))
auto It = ValueMap.find(PN);
if (It == ValueMap.end())
return;
Register DestReg = It->second;
if (DestReg == 0)
return
assert(Register::isVirtualRegister(DestReg) && "Expected a virtual reg");
LiveOutRegInfo.grow(DestReg);
LiveOutInfo &DestLOI = LiveOutRegInfo[DestReg];