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Unpin locals, attempt 2 #70655

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Jun 17, 2022
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Unpin locals, attempt 2 #70655

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6cc1125
Unpin locals (#70264)
aromaa Jun 11, 2022
73df659
Fix OSR
aromaa Jun 13, 2022
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4 changes: 1 addition & 3 deletions src/coreclr/jit/lclvars.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4712,8 +4712,6 @@ void Compiler::lvaComputeRefCounts(bool isRecompute, bool setSlotNumbers)
varDsc->setLvRefCnt(0);
varDsc->setLvRefCntWtd(BB_ZERO_WEIGHT);

varDsc->lvAllDefsAreNoGc = true;
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// Special case for some varargs params ... these must
// remain unreferenced.
const bool isSpecialVarargsParam = varDsc->lvIsParam && raIsVarargsStackArg(lclNum);
Expand Down Expand Up @@ -4762,7 +4760,7 @@ void Compiler::lvaComputeRefCounts(bool isRecompute, bool setSlotNumbers)
varDsc->lvSingleDef = varDsc->lvIsParam;
varDsc->lvSingleDefRegCandidate = varDsc->lvIsParam;

varDsc->lvAllDefsAreNoGc = true;
varDsc->lvAllDefsAreNoGc = (varDsc->lvImplicitlyReferenced == false);
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Suggested change
varDsc->lvAllDefsAreNoGc = (varDsc->lvImplicitlyReferenced == false);
// if there are implicit refs, assume they may be gc defs
varDsc->lvAllDefsAreNoGc = !varDsc->lvImplicitlyReferenced;

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This actually gives a compiler warning of "Using logical '!' when bitwise '~' was probably intended"

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Yeah, it's ok to leave this as is. For some reason all these bit fields are unsigned char and not bool.

}
}

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