[libre-riscv-dev] [Bug 334] New: POWER decode A=zero needs to be set as a flag in Execute1Type

[libre-riscv-dev] [Bug 334] New: POWER decode A=zero needs to be set as a flag in Execute1Type

[bugzilla-daemon]

https://bugs.libre-soc.org/show_bug.cgi?id=334

            Bug ID: 334
           Summary: POWER decode A=zero needs to be set as a flag in
                    Execute1Type
           Product: Libre-SOC's first SoC
           Version: unspecified
          Hardware: Other
                OS: Linux
            Status: CONFIRMED
          Severity: enhancement
          Priority: ---
         Component: Source Code
          Assignee: lkcl@lkcl.net
          Reporter: lkcl@lkcl.net
                CC: libre-riscv-dev@lists.libre-riscv.org
   NLnet milestone: ---

https://git.libre-soc.org/?p=soc.git;a=blob;f=src/soc/decoder/power_decoder2.py;h=3b9beba954a2f0f7ebefc7a731d8eddcb3705698;hb=HEAD

detection of zero RA reg needs to be passed through the CompUnits just as B
being used as an immediate.

this therefore needs to be done in the unit tests, qemu to check the
simulation, then HDL unit tests detect RA_OR_ZERO and likewise set A to zero.

a flag "a_is_zero" or such would be set in power_decode2 in the execute phase.

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[libre-riscv-dev] [Bug 334] POWER decode A=zero needs to be set as a flag in Execute1Type

[bugzilla-daemon]

https://bugs.libre-soc.org/show_bug.cgi?id=334

--- Comment #1 from Luke Kenneth Casson Leighton <lkcl@lkcl.net> ---
added the flag,
https://git.libre-soc.org/?p=soc.git;a=commitdiff;h=e0088f72dbd8b53acc587fa2ec2fb9fa4aeb17c5

commit 65aceac3fa2cdc1bc34120551c23a9dff681c02e (HEAD -> master, origin/master)
Author: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date:   Thu May 21 17:48:20 2020 +0100

    add zero_a flag to CompALUOpSubset

commit e0088f72dbd8b53acc587fa2ec2fb9fa4aeb17c5
Author: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date:   Thu May 21 17:44:21 2020 +0100

    add zero_a flag to Decode2ExecuteType

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[libre-riscv-dev] [Bug 334] POWER decode A=zero needs to be set as a flag in Execute1Type

[bugzilla-daemon]

https://bugs.libre-soc.org/show_bug.cgi?id=334

Luke Kenneth Casson Leighton <lkcl@lkcl.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.libre-soc.org/
                   |                            |show_bug.cgi?id=356

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