Fix the check for nested IT instructions in the disassembler. We need to perform the check before adding the Thumb predicate, which pops on entry off the ITBlock queue.
llvm-svn: 141339
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@ -724,15 +724,18 @@ DecodeStatus ThumbDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
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result = decodeThumb2Instruction16(MI, insn16, Address, this, STI);
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if (result != MCDisassembler::Fail) {
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Size = 2;
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// Nested IT blocks are UNPREDICTABLE. Must be checked before we add
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// the Thumb predicate.
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if (MI.getOpcode() == ARM::t2IT && !ITBlock.empty())
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result = MCDisassembler::SoftFail;
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Check(result, AddThumbPredicate(MI));
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// If we find an IT instruction, we need to parse its condition
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// code and mask operands so that we can apply them correctly
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// to the subsequent instructions.
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if (MI.getOpcode() == ARM::t2IT) {
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// Nested IT blocks are UNPREDICTABLE.
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if (!ITBlock.empty())
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return MCDisassembler::SoftFail;
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// (3 - the number of trailing zeros) is the number of then / else.
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unsigned firstcond = MI.getOperand(0).getImm();
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