linux-kernel - Re: [PATCH 6/9] perf: Generic pci uncore device support

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Message-ID: <1336081048.6509.26.camel@twins>
Date:	Thu, 03 May 2012 23:37:28 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	mingo@...e.hu, andi@...stfloor.org, eranian@...gle.com,
	jolsa@...hat.com, ming.m.lin@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/9] perf: Generic pci uncore device support

On Wed, 2012-05-02 at 10:07 +0800, Yan, Zheng wrote:
> +       if (box->pci_dev) {
> +               hwc->config_base = uncore_pci_event_ctl(box,
> hwc->idx);
> +               hwc->event_base =  uncore_pci_perf_ctr(box, hwc->idx);
> +       } else {
> +               hwc->config_base = uncore_msr_event_ctl(box,
> hwc->idx);
> +               hwc->event_base =  uncore_msr_perf_ctr(box, hwc->idx);
> +       } 

Since box is already an argument to uncore_*_event_ct[lr]() it could
include this conditional. Is GCC smart enough to pull it out and not
evaluate the condition twice in that case?


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