[Bug gas/27411] New: [ARM] Wrong error message when assembler cannot honor width suffix ("lo register required")

[kordalski.wojciech at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27411

            Bug ID: 27411
           Summary: [ARM] Wrong error message when assembler cannot honor
                    width suffix ("lo register required")
           Product: binutils
           Version: 2.35.1
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: kordalski.wojciech at gmail dot com
  Target Milestone: ---

Created attachment 13223
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13223&action=edit
Code that generates wrong assembler error message

For some instructions GAS returns wrong error message.

Code:

  ```
  .syntax unified
  .thumb

  .align 2
  .type f1, %function
  .thumb_func
  f1:
      add.n r4, #8
  ```

gives error message: 
  test.s:8: Error: lo register required -- `add.n r4,#8'

Same for `sub.n` instruction.

The right error message would be the one returned for `lsl.n` instruction:
  test.s:8: Error: cannot honor width suffix -- `lsl.n r4,#8'

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