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