[Bug gas/31323] New: [x86] GAS does not error out instruction that exceed 16 bytes

[wwwhhhyyy333 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31323

            Bug ID: 31323
           Summary: [x86] GAS does not error out instruction that exceed
                    16 bytes
           Product: binutils
           Version: 2.43 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: wwwhhhyyy333 at gmail dot com
  Target Milestone: ---

With APX NDD add, the instruction length would exceed 16byte when segment
prefix was used, e.g.

addq $0xe0, %fs:0, %rdx

Assembler only throws warning for such instruction unless manually turned on
--fatal-warnings. For general use it is better to error out such illegal
instruction by default, otherwise we only know it until runtime.

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