[LLVMbugs] [Bug 20338] New: Wrong disassembly of MOV64mr with 32 bit operand

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Jul 16 23:09:34 PDT 2014


            Bug ID: 20338
           Summary: Wrong disassembly of MOV64mr with 32 bit operand
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: jmuizelaar at mozilla.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

mov qword ptr [eax], rcx

disassembles as:

67 48 89 08 mov    dword ptr [eax], rcx


llvm-mc -x86-asm-syntax=intel -filetype=obj -o object.o wrong-disasm.s 
 && llvm-objdump -x86-asm-syntax=intel -d object.o

During disassembly, we incorrectly create a MOV32mr opcode instead of the
MOV64mr that we're supposed to create.

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