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Let GenTreeCopyOrReload handle scenarios when FEATURE_MULTIREG_RET is disabled #82451

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Feb 24, 2023
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Let GenTreeCopyOrReload handle scenarios when FEATURE_MULTIREG_RET is disabled #82451

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65e6b59
remove FEATURE_MULTIREG_RET check
kunalspathak Feb 21, 2023
ab7ffa3
Remove comments
kunalspathak Feb 21, 2023
d032b8e
updated comment
kunalspathak Feb 22, 2023
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7 changes: 4 additions & 3 deletions src/coreclr/jit/gentree.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -975,12 +975,12 @@ bool GenTree::IsMultiRegNode() const
return AsMultiRegOp()->GetRegCount() > 1;
}
#endif
#endif // FEATURE_MULTIREG_RET

if (OperIs(GT_COPY, GT_RELOAD))
{
return true;
}
#endif // FEATURE_MULTIREG_RET

#ifdef FEATURE_HW_INTRINSICS
if (OperIsHWIntrinsic())
Expand Down Expand Up @@ -1026,12 +1026,12 @@ unsigned GenTree::GetMultiRegCount(Compiler* comp) const
return AsMultiRegOp()->GetRegCount();
}
#endif
#endif // FEATURE_MULTIREG_RET

if (OperIs(GT_COPY, GT_RELOAD))
{
return AsCopyOrReload()->GetRegCount();
}
#endif // FEATURE_MULTIREG_RET

#ifdef FEATURE_HW_INTRINSICS
if (OperIsHWIntrinsic())
Expand Down Expand Up @@ -11696,7 +11696,8 @@ void Compiler::gtDispLeaf(GenTree* tree, IndentStack* indentStack)
fieldVarDsc->PrintVarReg();
}

if (fieldVarDsc->lvTracked && fgLocalVarLivenessDone && tree->AsLclVar()->IsLastUse(index))
if (fieldVarDsc->lvTracked && fgLocalVarLivenessDone &&
tree->AsLclVarCommon()->IsLastUse(index))
{
printf(" (last use)");
}
Expand Down
23 changes: 3 additions & 20 deletions src/coreclr/jit/gentree.h
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Expand Up @@ -8039,17 +8039,14 @@ struct GenTreePutArgSplit : public GenTreePutArgStk
// Represents GT_COPY or GT_RELOAD node
//
// As it turns out, these are only needed on targets that happen to have multi-reg returns.
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Suggested change
// As it turns out, these are only needed on targets that happen to have multi-reg returns.
// Needed to support multi-reg ops.

// However, they are actually needed on any target that has any multi-reg ops. It is just
// coincidence that those are the same (and there isn't a FEATURE_MULTIREG_OPS).
// However, they are actually needed on any target that has any multi-reg ops.
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Suggested change
// However, they are actually needed on any target that has any multi-reg ops.

Otherwise the comments contradict themselves:

... are only needed on targets that happen to have multi-reg returns ...
... are actually needed on any target that has any multi-reg ops ...

//
struct GenTreeCopyOrReload : public GenTreeUnOp
{
#if FEATURE_MULTIREG_RET
// State required to support copy/reload of a multi-reg call node.
// The first register is always given by GetRegNum().
//
regNumberSmall gtOtherRegs[MAX_MULTIREG_COUNT - 1];
#endif

//----------------------------------------------------------
// ClearOtherRegs: set gtOtherRegs to REG_NA.
Expand All @@ -8062,12 +8059,10 @@ struct GenTreeCopyOrReload : public GenTreeUnOp
//
void ClearOtherRegs()
{
#if FEATURE_MULTIREG_RET
for (unsigned i = 0; i < MAX_MULTIREG_COUNT - 1; ++i)
{
gtOtherRegs[i] = REG_NA;
}
#endif
}

//-----------------------------------------------------------
Expand All @@ -8088,11 +8083,7 @@ struct GenTreeCopyOrReload : public GenTreeUnOp
return GetRegNum();
}

#if FEATURE_MULTIREG_RET
return (regNumber)gtOtherRegs[idx - 1];
#else
return REG_NA;
#endif
}

//-----------------------------------------------------------
Expand All @@ -8113,18 +8104,11 @@ struct GenTreeCopyOrReload : public GenTreeUnOp
{
SetRegNum(reg);
}
#if FEATURE_MULTIREG_RET
else
{
gtOtherRegs[idx - 1] = (regNumberSmall)reg;
assert(gtOtherRegs[idx - 1] == reg);
}
#else
else
{
unreached();
}
#endif
}

//----------------------------------------------------------------------------
Expand Down Expand Up @@ -8153,7 +8137,6 @@ struct GenTreeCopyOrReload : public GenTreeUnOp

unsigned GetRegCount() const
{
#if FEATURE_MULTIREG_RET
// We need to return the highest index for which we have a valid register.
// Note that the gtOtherRegs array is off by one (the 0th register is GetRegNum()).
// If there's no valid register in gtOtherRegs, GetRegNum() must be valid.
Expand All @@ -8168,7 +8151,7 @@ struct GenTreeCopyOrReload : public GenTreeUnOp
return i;
}
}
#endif

// We should never have a COPY or RELOAD with no valid registers.
assert(GetRegNum() != REG_NA);
return 1;
Expand Down Expand Up @@ -9097,12 +9080,12 @@ inline regNumber GenTree::GetRegByIndex(int regIndex) const
return AsMultiRegOp()->GetRegNumByIdx(regIndex);
}
#endif
#endif // FEATURE_MULTIREG_RET

if (OperIs(GT_COPY, GT_RELOAD))
{
return AsCopyOrReload()->GetRegNumByIdx(regIndex);
}
#endif // FEATURE_MULTIREG_RET

#ifdef FEATURE_HW_INTRINSICS
if (OperIs(GT_HWINTRINSIC))
Expand Down