[Libre-soc-bugs] [Bug 1093] New: Fix "GPR-or-zero" in binutils and openpower-isa

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1093

            Bug ID: 1093
           Summary: Fix "GPR-or-zero" in binutils and openpower-isa
           Product: Libre-SOC's first SoC
           Version: unspecified
          Hardware: PC
                OS: Windows
            Status: CONFIRMED
          Severity: enhancement
          Priority: ---
         Component: Source Code
          Assignee: lkcl at lkcl.net
          Reporter: ghostmansd at gmail.com
                CC: libre-soc-bugs at lists.libre-soc.org
   NLnet milestone: ---

Currently our support for RA_OR_ZERO and RT_OR_ZERO leaves much to be desired.
These, when 0 is supplied as an operand, should yield 0, not r0, as usual RA
and RT operands do.
1. openpower-isa disassembly doesn't diagnose these correctly at all, and
treats them as usual GPRs.
2. binutils lack RT0 operand, the only instruction using RT0 is setvl, and
support for this operand has been missing.

More details in IRC:
https://libre-soc.org/irclog/%23libre-soc.2023-05-29.log.html#t2023-05-29T16:37:17.

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