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fixed the split error for LoongArch64. #101656

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merged 4 commits into from Apr 29, 2024
Merged

fixed the split error for LoongArch64. #101656

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896aa2b
fixed the split error for LoongArch64.
shushanhf Apr 28, 2024
3bf26c9
amend code for CRs.
shushanhf Apr 28, 2024
6bf9d17
amend the splitting's judge independent of the `var->lvIsSplit` which
shushanhf Apr 28, 2024
6b223d3
revert `IsSplitAcrossRegistersAndStack()`.
shushanhf Apr 29, 2024
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12 changes: 4 additions & 8 deletions src/coreclr/jit/abi.cpp
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Expand Up @@ -258,16 +258,12 @@ bool ABIPassingInformation::HasExactlyOneStackSegment() const
//
bool ABIPassingInformation::IsSplitAcrossRegistersAndStack() const
{
if (NumSegments < 2)
return false;

bool isFirstInReg = Segments[0].IsPassedInRegister();
for (unsigned i = 1; i < NumSegments; i++)
if (NumSegments != 2)
{
if (isFirstInReg != Segments[i].IsPassedInRegister())
return true;
return false;
}
return false;

return Segments[0].IsPassedInRegister() && Segments[1].IsPassedOnStack();
}
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//-----------------------------------------------------------------------------
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35 changes: 22 additions & 13 deletions src/coreclr/jit/codegencommon.cpp
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Expand Up @@ -4261,25 +4261,34 @@ void CodeGen::genHomeStackPartOfSplitParameter(regNumber initReg, bool* initRegS
for (; lclNum < compiler->info.compArgsCount; lclNum++)
{
LclVarDsc* var = compiler->lvaGetDesc(lclNum);
if (!var->lvIsSplit || !var->lvOnFrame)
if (!var->lvOnFrame || !varTypeIsStruct(var))
{
continue;
}

JITDUMP("Homing stack part of split parameter V%02u\n", lclNum);

assert(varTypeIsStruct(var));
assert(!compiler->lvaIsImplicitByRefLocal(lclNum));
const ABIPassingInformation& abiInfo = compiler->lvaGetParameterABIInfo(lclNum);
assert(abiInfo.NumSegments == 2);
assert(abiInfo.Segments[0].GetRegister() == REG_ARG_LAST);
const ABIPassingSegment& seg = abiInfo.Segments[1];
if (abiInfo.IsSplitAcrossRegistersAndStack())
{
assert(var->lvIsSplit);
JITDUMP("Homing stack part of split parameter V%02u\n", lclNum);

genHomeStackSegment(lclNum, seg, initReg, initRegStillZeroed);
assert(abiInfo.NumSegments == 2);
assert(abiInfo.Segments[0].GetRegister() == REG_ARG_LAST);
assert(abiInfo.Segments[1].GetStackOffset() == 0);
const ABIPassingSegment& seg = abiInfo.Segments[1];

for (lclNum += 1; lclNum < compiler->info.compArgsCount; lclNum++)
{
assert(!compiler->lvaGetDesc(lclNum)->lvIsSplit); // There should be only one split parameter
genHomeStackSegment(lclNum, seg, initReg, initRegStillZeroed);

#ifdef DEBUG
for (lclNum += 1; lclNum < compiler->info.compArgsCount; lclNum++)
{
abiInfo = compiler->lvaGetParameterABIInfo(lclNum);
// There should be only one split parameter
assert(!abiInfo.IsSplitAcrossRegistersAndStack());
}
#endif
break;
}
break;
}
#endif // TARGET_RISCV64 || TARGET_LOONGARCH64
}
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