From: Richard Henderson <richard.henderson@linaro.org>
To: "Howard Spoelstra" <hsp.cat7@gmail.com>,
"Alex Bennée" <alex.bennee@linaro.org>
Cc: qemu-devel qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH v3 00/22] re-factor softfloat and add fp16 functions
Date: Wed, 24 Jan 2018 16:09:00 -0800 [thread overview]
Message-ID: <9cc3c0d8-26f4-5626-e0f1-e449068eaac1@linaro.org> (raw)
In-Reply-To: <CABLmASFzQz+=LD_RBn_PfPzY2JdMT71DM3F5jK9J=i2CmxOShQ@mail.gmail.com>
On 01/24/2018 01:49 PM, Howard Spoelstra wrote:
> Hi,
>
> I built qemu-system-ppc for OSX and Windows from
> https://github.com/stsquad/qemu/tree/softfloat-refactor-and-fp16-v3
> and noticed a considerable drop in floating point performance on both
> hosts.
> Running Mac OS 9.2 in OSX, using MacBench 3.0, the score for the
> floating point performance dropped from ~60 to ~42.
>
> Recent tcg optimisations had improved processor and floating point
> performance considerably, but that gain seems to be more than lost for
> the floating point performance.
>
> Any idea what is causing this?
Is this a 64-bit or a 32-bit build?
We made a conscious choice to share code and use all 64-bit operations, under
the assumption that x86_64 is the most common host.
Otherwise we have not really done extensive benchmarking.
r~
next prev parent reply other threads:[~2018-01-25 0:09 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-24 21:49 [Qemu-devel] [PATCH v3 00/22] re-factor softfloat and add fp16 functions Howard Spoelstra
2018-01-25 0:09 ` Richard Henderson [this message]
2018-01-25 0:15 ` Howard Spoelstra
2018-01-25 12:59 ` Alex Bennée
2018-01-28 20:41 ` Emilio G. Cota
2018-01-29 19:14 ` Richard Henderson
-- strict thread matches above, loose matches on Subject: below --
2018-01-24 13:12 Alex Bennée
2018-01-24 13:42 ` no-reply
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