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From: "Rahul Kharche" <rahul@IceraSemi.com>
To: "Steven Bosscher" <stevenb.gcc@gmail.com>
Cc: "Jan Hubicka" <hubicka@ucw.cz>, 	<gcc@gcc.gnu.org>,
		"sdkteam-gnu" <sdkteam-gnu@IceraSemi.com>
Subject: RE: branch probabilities on multiway branches
Date: Tue, 20 Apr 2010 18:20:00 -0000	[thread overview]
Message-ID: <4D60B0700D1DB54A8C0C6E9BE69163700E780BF5@EXCHANGEVS.IceraSemi.local> (raw)
In-Reply-To: <z2i571f6b511004150456h5c4ce5f9g13704b78b64182ad@mail.gmail.com>

Hi Steven,

> There is a transformation implemented in GCC's
> value profiling to put the most-frequently taken case-label of a
> switch-expr at the top of the switch

Could you point me to the bit of code that does this?

I'm exploring the idea of implementing source hints much like
__builtin_expect which would assign a probability to a case range
in a switch construct. I will have to tweak the case expansion
phase to implement a similar transformation to the one you mentioned
earlier.

Cheers,
Rahul

  parent reply	other threads:[~2010-04-20 18:03 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-04-13 16:51 Rahul Kharche
2010-04-14  0:08 ` Jan Hubicka
2010-04-15 11:56   ` Rahul Kharche
2010-04-15 11:57     ` Steven Bosscher
2010-04-15 14:54       ` Rahul Kharche
2010-04-15 16:59       ` Rahul Kharche
2010-04-15 22:54       ` Jan Hubicka
2010-04-20 18:20       ` Rahul Kharche [this message]
     [not found]         ` <l2ld17039311004211227l9c7de73ex9cb83c186a945a51@mail.gmail.com>
2010-04-22 11:29           ` Rahul Kharche
2010-05-04 12:01             ` Rahul Kharche

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