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Do not assume about another half regrec #53412

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May 28, 2021
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Do not assume about another half regrec #53412

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8 changes: 2 additions & 6 deletions src/coreclr/jit/lsra.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5615,10 +5615,6 @@ void LinearScan::allocateRegisters()
// Return Value:
// None
//
// Assumptions:
// For ARM32, when "regType" is TYP_DOUBLE, "reg" should be a even-numbered
// float register, i.e. lower half of double register.
//
// Note:
// For ARM32, two float registers consisting a double register are updated
// together when "regType" is TYP_DOUBLE.
Expand All @@ -5631,8 +5627,8 @@ void LinearScan::updateAssignedInterval(RegRecord* reg, Interval* interval, Regi
regNumber doubleReg = REG_NA;
if (regType == TYP_DOUBLE)
{
doubleReg = reg->regNum;
RegRecord* anotherHalfReg = getSecondHalfRegRec(reg);
RegRecord* anotherHalfReg = findAnotherHalfRegRec(reg);
doubleReg = genIsValidDoubleReg(reg->regNum) ? reg->regNum : anotherHalfReg->regNum;
anotherHalfReg->assignedInterval = interval;
}
else if ((oldAssignedInterval != nullptr) && (oldAssignedInterval->registerType == TYP_DOUBLE))
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