From: "Emilio G. Cota" <cota@braap.org>
To: Michael Clark <mjc@sifive.com>
Cc: Stef O'Rear <sorear2@gmail.com>,
RISC-V Patches <patches@groups.riscv.org>,
Palmer Dabbelt <palmer@sifive.com>,
QEMU Developers <qemu-devel@nongnu.org>,
Sagar Karandikar <sagark@eecs.berkeley.edu>,
Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Subject: Re: [Qemu-devel] [patches] Re: [PULL] RISC-V QEMU Port Submission
Date: Wed, 28 Feb 2018 17:26:27 -0500 [thread overview]
Message-ID: <20180228222627.GA3575@flamenco> (raw)
In-Reply-To: <CAHNT7Nv04hScm7QDtJMhFZeB=WOyOQ6HW1J-xOEO11GM1xFqyA@mail.gmail.com>
On Wed, Feb 28, 2018 at 13:09:11 +1300, Michael Clark wrote:
> BTW somewhat coincidentally, the binary translator I wrote; RV8, which is
> practicaly twice as fast as QEMU only supports privileged ISA v1.9.1 and I
> personally want to keep binary compatiblity with it.
(snip)
> - https://rv8.io/
> - https://rv8.io/bench
> - https://anarch128.org/~mclark/rv8-carrv.pdf
> - https://anarch128.org/~mclark/rv8-slides.pdf
What QEMU versions did you use for those comparisons? I wonder if
the recent indirect branch handling improvements were included in those
(this work was merged in 2.10 for aarch64). Also, 2.7 is quite a bit
faster than previous versions for user-mode due to the use of QHT,
although you probably used a later version.
BTW after the merge you might want to look into optimizing indirect
branches (and cross-page direct jumps in softmmu) for riscv in qemu.
See examples with
$ git log -Stcg_gen_lookup_and_goto_ptr
Cheers,
Emilio
next prev parent reply other threads:[~2018-02-28 22:26 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-27 0:15 [Qemu-devel] [PULL] RISC-V QEMU Port Submission Michael Clark
2018-02-27 14:01 ` Peter Maydell
2018-02-27 15:50 ` [Qemu-devel] [patches] " Stef O'Rear
2018-02-27 17:50 ` Peter Maydell
2018-02-28 0:21 ` Michael Clark
2018-02-28 0:09 ` Michael Clark
2018-02-28 11:53 ` Peter Maydell
2018-02-28 12:09 ` Peter Maydell
2018-02-28 20:40 ` Michael Clark
2018-03-03 2:09 ` Michael Clark
2018-02-28 22:26 ` Emilio G. Cota [this message]
2018-03-02 13:26 ` Michael Clark
2018-03-05 19:00 ` Emilio G. Cota
2018-03-05 23:31 ` Michael Clark
2018-02-27 16:00 ` [Qemu-devel] " Igor Mammedov
2018-02-28 0:41 ` [Qemu-devel] [patches] " Michael Clark
2018-02-28 10:41 ` Igor Mammedov
2018-02-28 0:34 ` [Qemu-devel] " Michael Clark
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