http://llvm.org/bugs/show_bug.cgi?id=14780
Bug #: 14780
Summary: Thumb2: CBZ and CBNZ have to use zero-extend
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: ARM
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
~$ echo '0x013 0xbb' | ~/llvm/llvm-svn/llvm/Debug+Asserts/bin/llvm-mc
-disassemble -arch=thumb -mattr=+v7
.section __TEXT,__text,regular,pure_instructions
cbnz r3, #-60
(the immediate value must be 68)
according to ARM's reference manual, imm32 = ZeroExtend(i:imm5:'0', 32);
the immediate value can't be negative
I think the integer-extending stratgy in DecodeThumbCmpBROperand in
lib/Target/ARM/Disassembler/ARMDisassembler.cpp must be zero-extend, not
sign-extend.
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