[llvm-bugs] [Bug 34568] New: Cannot encode LSL with REX.W prefix

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34568

            Bug ID: 34568
           Summary: Cannot encode LSL with REX.W prefix
           Product: libraries
           Version: 4.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: kadircetinkaya.06.tr at gmail.com
                CC: llvm-bugs at lists.llvm.org

LSL RAX, EBX

cannot be assembled, but as mentioned in July 2017 version of the Instruction
Set Reference page 649 it is possible to encode this instruction with

REX.W + 0F 03 /r 
LSL r64, r32/m16* 
Load: r64 ← segment limit, selector r32/m16

this encoding specificaiton.

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