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

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Sep 12 02:09:48 PDT 2017


            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


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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