[Bug gas/27647] New: [PowerPC] Extended conditional branch mnemonics should accept an optional branch hint operand

[pc at us dot ibm.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27647

            Bug ID: 27647
           Summary: [PowerPC] Extended conditional branch mnemonics should
                    accept an optional branch hint operand
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: pc at us dot ibm.com
  Target Milestone: ---

Per Power ISA Book I Appendix C.2, "for all the extended mnemonics [...] that
devolve to any of these four basic mnemonics the BH operand can either be coded
or omitted." (The "four basic mnemonics" are bclr, bclrl, bcctr, or bcctrl, so
this issue probably impacts all of them.)

That says to me that something like:
  btlr 0,1
should compile, with "0" representing BI (the CR bit), and "1" representing BH
(the branch hint).

"btlr 0,1" devolves to "bclr 12,0,1".

This construct produces an error:
--
$ as --version
GNU assembler (GNU Binutils) 2.35.1.20201003
[...]
$ cat a.s
 btlr 0,1
$ as a.s
a.s: Assembler messages:
a.s:1: Error: junk at end of line: `1'
--

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