From: Doug Goldstein <cardoe@cardoe.com>
To: "Andrew Cooper" <andrew.cooper3@citrix.com>,
"Wei Liu" <wei.liu2@citrix.com>,
"Roger Pau Monné" <roger.pau@citrix.com>
Cc: Julien Grall <julien.grall@arm.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Jan Beulich <JBeulich@suse.com>,
Xen-devel <xen-devel@lists.xen.org>
Subject: Re: [PATCH] xen/common: Drop function calls for Xen compile/version information
Date: Wed, 18 Jan 2017 14:01:46 -0500 [thread overview]
Message-ID: <277f9e5c-bb87-7980-77c6-1e4e117522fb@cardoe.com> (raw)
In-Reply-To: <ae7d5e3e-ffc7-8125-9e7c-5c084b190f8d@citrix.com>
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On 1/18/17 12:04 PM, Andrew Cooper wrote:
> Last time I tried LTO:
>
> * The GCC build did work, but the net binary was bigger rather than
> smaller, and it successfully boot
> * The Clang build worked, made a much smaller binary, but due to a clang
> bug, "optimised" code into using SSE, and blew up spectacularly when
> booting.
>
> From experiments with XTF, Clang 3.9 LTO is far more comprehensive, and
> is basically capable of optimising entire XTF tests into one single test
> function, and properly respects the "no FPU ever" options used during boot.
>
> ~Andrew
FWIW, some of the clang issues I reported against LTO and FPU bits are
marked as fixed in 3.9 and 4.0. Not sure if things got backported.
--
Doug Goldstein
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prev parent reply other threads:[~2017-01-18 19:01 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-16 13:04 [PATCH] xen/common: Drop function calls for Xen compile/version information Andrew Cooper
2017-01-16 13:18 ` Jan Beulich
2017-01-16 13:26 ` Andrew Cooper
2017-01-16 18:23 ` Stefano Stabellini
2017-01-16 19:44 ` Doug Goldstein
2017-01-17 18:05 ` Konrad Rzeszutek Wilk
2017-01-17 18:16 ` Andrew Cooper
2017-01-17 18:42 ` Konrad Rzeszutek Wilk
2017-01-17 19:00 ` Konrad Rzeszutek Wilk
2017-01-17 20:39 ` Andrew Cooper
2017-01-17 20:46 ` Konrad Rzeszutek Wilk
2017-01-18 10:13 ` Roger Pau Monné
2017-01-18 16:10 ` Konrad Rzeszutek Wilk
2017-01-18 16:21 ` Roger Pau Monné
2017-01-18 16:30 ` Wei Liu
2017-01-18 17:04 ` Andrew Cooper
2017-01-18 19:01 ` Doug Goldstein [this message]
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