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Fix issue with disassembler decoding CBZ/CBNZ immediates as negatives when the upper bit is set.

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They should always be zero-extended, not sign extended.  Added test case.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178275 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gordon Keiser 2013-03-28 19:22:28 +00:00
parent 93b10789c6
commit ce88835110
2 changed files with 5 additions and 2 deletions
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4
lib/Target/ARM/Disassembler/ARMDisassembler.cpp
View File

@ -3049,9 +3049,9 @@ static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<7>(Val<<1) + 4,
if (!tryAddingSymbolicOperand(Address, Address + (Val<<1) + 4,
true, 2, Inst, Decoder))
Inst.addOperand(MCOperand::CreateImm(SignExtend32<7>(Val << 1)));
Inst.addOperand(MCOperand::CreateImm(Val << 1));
return MCDisassembler::Success;
}

3
test/MC/Disassembler/ARM/thumb2.txt
View File

@ -254,9 +254,12 @@
#------------------------------------------------------------------------------
# CHECK: cbnz r7, #6
# CHECK: cbnz r7, #12
# CHECK: cbz r4, #64
0x1f 0xb9
0x37 0xb9
0x04 0xb3
#------------------------------------------------------------------------------
# CDP/CDP2