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Fix bitfield decoding based on Eli's feedback. 

llvm-svn: 139969
This commit is contained in:
Owen Anderson 2011-09-16 23:04:48 +00:00
parent 459597a6eb
commit b925e935d7
1 changed files with 3 additions and 4 deletions
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7
llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
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@ -1004,10 +1004,9 @@ static DecodeStatus DecodeBitfieldMaskOperand(llvm::MCInst &Inst, unsigned Val,
unsigned msb = fieldFromInstruction32(Val, 5, 5);
unsigned lsb = fieldFromInstruction32(Val, 0, 5);
uint32_t msb_mask = (1 << (msb+1)) - 1;
if (msb == 31) msb_mask = 0xFFFFFFFF;
uint32_t lsb_mask = (1 << lsb) - 1;
if (lsb == 31) lsb_mask = 0xFFFFFFFF;
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;