[llvm-bugs] [Bug 34475] New: LOCK/REP/REPNE prefixes emitted as instruction on their own

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34475

            Bug ID: 34475
           Summary: LOCK/REP/REPNE prefixes emitted as instruction on
                    their own
           Product: libraries
           Version: 4.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: kadircetinkaya.06.tr at gmail.com
                CC: llvm-bugs at lists.llvm.org

readPrefixes in lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp treats
0xf0, 0xf2 and 0xf3 as instructions instead of prefixes, so

echo '0xf2 0xa4' | llvm-mc -disassemble

this one outputs

repne
movsb

as two separate instructions, while repne doesn't have a meaning without movsb.

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