netdev - RE: [RFC] net: bpf_jit: Two pass JIT and other changes

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Date:	Mon, 2 Apr 2012 10:28:07 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Indan Zupancic" <indan@....nu>,
	"Eric Dumazet" <eric.dumazet@...il.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: RE: [RFC] net: bpf_jit: Two pass JIT and other changes

 
> 1) Sadly, gcc isn't always smart enough to inline emit_code().
>    So turn it into a macro to force gcc to inline it. This saves
>    about 500 bytes. Tested with gcc 4.6.0. An alternative to the
>    macro would be to create inline emit_code1(), emit_code2() etc.

Does giving it the __attribute__((always_inline)) help?
I had to mark a load of small static functions that way
after a minor change (possibly to the overall size)
stopped gcc inlining everything.

I have also noticed in the past that gcc tends to generate
better code for #define than when inlining functions.

	David


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