netdev - Re: [PATCH net-next 0/5] bonding: simple macro cleanup

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Date:	Wed, 14 May 2014 15:03:53 -0700
From:	Joe Perches <joe@...ches.com>
To:	Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:	Veaceslav Falico <vfalico@...il.com>,
	David Laight <David.Laight@...lab.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Jay Vosburgh <j.vosburgh@...il.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	Veaceslav Falico <vfalico@...hat.com>
Subject: Re: [PATCH net-next 0/5] bonding: simple macro cleanup

On Wed, 2014-05-14 at 14:52 -0700, Alexei Starovoitov wrote:
> I cannot imagine the case where macro would be faster than static inline
> unless it wasn't inlined.

For an example, look at commit 4153577a8d
("tg3: Use different macros for pci_chip_rev_id accesses")

Converting these macros to static inline produces
larger/slower code.  (at least with gcc 4.7.3)

+#define tg3_chip_rev_id(tp)                                    \
+       ((tp)->pci_chip_rev_id)
+#define tg3_asic_rev(tp)                                       \
+       ((tp)->pci_chip_rev_id >> 12)
+#define tg3_chip_rev(tp)                                       \
+       ((tp)->pci_chip_rev_id >> 8)


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