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Fix bitfield unallocated #34

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Fix bitfield unallocated #34

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3 changes: 2 additions & 1 deletion src/aarch64/simulator-aarch64.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -5474,17 +5474,18 @@ void Simulator::VisitBitfield(const Instruction* instr) {

if (instr->GetSixtyFourBits() != instr->GetBitN()) {
VisitUnallocated(instr);
return;
}

if ((instr->GetSixtyFourBits() == 0) && ((S > 31) || (R > 31))) {
VisitUnallocated(instr);
return;
}

int diff = S - R;
uint64_t mask;
if (diff >= 0) {
mask = ~UINT64_C(0) >> (64 - (diff + 1));
mask = (static_cast<unsigned>(diff) < (reg_size - 1)) ? mask : reg_mask;
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diff=31 reg_size=32 mask=reg_mask=0xFFFFFFFF
diff=63 reg_size=64 mask=reg_mask

} else {
mask = ~UINT64_C(0) >> (64 - (S + 1));
mask = RotateRight(mask, R, reg_size);
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