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From: Richard Henderson <rth@twiddle.net>
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Date: Tue, 5 Apr 2016 12:15:34 -0700
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Subject: Re: [Qemu-devel] [PATCH 02/10] compiler.h: add QEMU_CACHELINE +
 QEMU_ALIGN() + QEMU_CACHELINE_ALIGNED
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To: Peter Maydell <peter.maydell@linaro.org>, MTTCG Devel <mttcg@greensocs.com>, Peter Crosthwaite <crosthwaite.peter@gmail.com>, QEMU Developers <qemu-devel@nongnu.org>, "Emilio G. Cota" <cota@braap.org>, Paolo Bonzini <pbonzini@redhat.com>, Sergey Fedorov <serge.fdrv@gmail.com>, =?UTF-8?Q?Alex_Benn=c3=a9e?= <alex.bennee@linaro.org>

On 04/05/2016 12:02 PM, Lluís Vilanova wrote:
> Peter Maydell writes:
> 
>> On 5 April 2016 at 17:31, Richard Henderson <rth@twiddle.net> wrote:
>>> On 04/05/2016 09:23 AM, Lluís Vilanova wrote:
>>>>
>>>> Got it!
>>>>
>>>> gcc -march=native --help=params -v 2>&1 | grep "param
>>>> l1-cache-line-size" | sed -e 's/.* --param l1-cache-line-size=\([0-9]\+\)
>>>> .*/\1/'
>>>
>>>
>>> That will only work on x86, where we can be pretty sure it's 64 anyway.
> 
> Oh, you mean l1-cache-line-size is an x86-only parameter in GCC?

No, using -march=native to detect the host line size.


r~