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From: Alex =?utf-8?Q?Benn=C3=A9e?= <alex.bennee@linaro.org>
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Date: Mon, 13 Jul 2015 17:36:42 +0100
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Subject: Re: [Qemu-devel] [RFC PATCH V2 2/3] cpus: add a tcg_executing flag.
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: mttcg@greensocs.com, Peter Maydell <peter.maydell@linaro.org>, Mark Burton <mark.burton@greensocs.com>, Alvise Rigo <a.rigo@virtualopensystems.com>, QEMU Developers <qemu-devel@nongnu.org>, Guillaume Delbergue <guillaume.delbergue@greensocs.com>, KONRAD =?utf-8?B?RnLDqWQ=?= =?utf-8?B?w6lyaWM=?= <fred.konrad@greensocs.com>


Paolo Bonzini <pbonzini@redhat.com> writes:

> On 13/07/2015 18:10, Peter Maydell wrote:
>>  (4) a few other things which are suspicious at best:
>>   hw/intc/apic_common.c:    volatile int a_i_d = apic_irq_delivered;
>
> This one has a comment above:
>
>     /* Copy this into a local variable to encourage gcc to emit a plain
>      * register for a sys/sdt.h marker.  For details on this workaround, see:
>      * https://sourceware.org/bugzilla/show_bug.cgi?id=13296
>      */
>
>>   hw/xen/xen_pt_msi.c:        const volatile uint32_t *vec_ctrl;
>
> Seems to be MMIO (yes, really), so okay.

For some reason I don't find the use of the word "encourage" w.r.t
compiler behaviour particularly encouraging ;-)

-- 
Alex Bennée