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From: "research_trasio at irq dot a4lg.com"
 <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug sim/29595] New: RISC-V simulator cannot run multiply
 instructions
Date: Thu, 22 Sep 2022 04:13:35 +0000
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X-Bugzilla-Version: HEAD
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29595

            Bug ID: 29595
           Summary: RISC-V simulator cannot run multiply instructions
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: sim
          Assignee: unassigned at sourceware dot org
          Reporter: research_trasio at irq dot a4lg.com
                CC: vapier at gentoo dot org
  Target Milestone: ---

Created attachment 14343
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D14343&action=3Ded=
it
Reproduction source code + generated object files + simulator logs

[POSSIBLE RELEASE BLOCKER FOR GDB 13.1]

On the latest master, RISC-V simulator cannot run multiply instructions (but
CAN run division instructions).

I completely know the cause:
On the Binutils side, new multiply-only instruction subset extension 'Zmmul=
' is
being added.  I sent a patchset which spans *both Binutils and GDB* but *on=
ly
Binutils part is committed.*

This is the one (same but both to binutils and gdb-patches ML):
<https://sourceware.org/pipermail/binutils/2022-August/122653.html>
<https://sourceware.org/pipermail/gdb-patches/2022-August/191295.html>

I'm proposing remaining part (GDB / simulator part) as a separate patchset =
but
there's no response from the GDB side...
<https://sourceware.org/pipermail/gdb-patches/2022-August/191609.html>
<https://sourceware.org/pipermail/gdb-patches/2022-September/191841.html> (=
ping
1)
<https://sourceware.org/pipermail/gdb-patches/2022-September/191995.html> (=
ping
2)

Not being able to run the multiply instructions on the simulator is clearly=
 a
release blocker for GDB 13.1.  So I'm reporting this to track this issue.

My copyright assignment to both Binutils and GDB is complete and I'm now ev=
en a
"write after approval" committer.  If a maintainer gives me an approval, I =
can
commit it in a day.


GitHub tracker of me:
<https://github.com/a4lg/binutils-gdb/wiki/sim_riscv_zmmul>
<https://github.com/a4lg/binutils-gdb/wiki/riscv_zmmul>

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