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Bitfield mask instructions are unpredictable if the encoded LSB is higher than the encoded MSB. 

llvm-svn: 139972
This commit is contained in:
Owen Anderson 2011-09-16 23:30:01 +00:00
parent 2f55019bf0
commit 502cd9d87a
1 changed files with 4 additions and 1 deletions
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5
llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
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@ -1004,12 +1004,15 @@ static DecodeStatus DecodeBitfieldMaskOperand(llvm::MCInst &Inst, unsigned Val,
unsigned msb = fieldFromInstruction32(Val, 5, 5);
unsigned lsb = fieldFromInstruction32(Val, 0, 5);
DecodeStatus S = MCDisassembler::Success;
if (lsb > msb) Check(S, MCDisassembler::SoftFail);
uint32_t msb_mask = 0xFFFFFFFF;
if (msb != 31) msb_mask = (1U << (msb+1)) - 1;
uint32_t lsb_mask = (1U << lsb) - 1;
Inst.addOperand(MCOperand::CreateImm(~(msb_mask ^ lsb_mask)));
return MCDisassembler::Success;
return S;
}
static DecodeStatus DecodeCopMemInstruction(llvm::MCInst &Inst, unsigned Insn,