This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: more tidying of x86 feature tests

From: Richard Henderson <rth at redhat dot com>
To: Jan Hubicka <hubicka at ucw dot cz>
Cc: gcc-patches at gcc dot gnu dot org
Date: Tue, 6 Mar 2007 08:45:45 -0800
Subject: Re: more tidying of x86 feature tests
References: <20070306160654.GA23909@redhat.com> <20070306161844.GG12761@atrey.karlin.mff.cuni.cz>

On Tue, Mar 06, 2007 at 05:18:44PM +0100, Jan Hubicka wrote:
> does it really make CC1 smaller/faster?

Dunno; I forgot to save the old cc1.

> I would expect that in many
> places we test things like TARGET_something || TARGET_something_else
> that can be simplified into single & operation in the former scheme.

Yes, but here we have no and operations.  That can't help but be
a bit faster.

> THe individual flags could probably use some more comments, I will try
> to put together something.

Yes.  I think there are also some that are redundant.  Particularly
wrt to QImode promotion, and partial register stall/dependencies.

r~

References:
- more tidying of x86 feature tests
  - From: Richard Henderson
- Re: more tidying of x86 feature tests
  - From: Jan Hubicka

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]