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Re: [PING]^2 New if-combining pass

From: Mark Mitchell <mark at codesourcery dot com>
To: Richard Guenther <rguenther at suse dot de>
Cc: Richard Guenther <richard dot guenther at gmail dot com>, gcc-patches at gcc dot gnu dot org
Date: Mon, 11 Jun 2007 07:53:13 -0700
Subject: Re: [PING]^2 New if-combining pass
References: <84fc9c000706101333k6a4cddd1se3d5d4fbd38441b5@mail.gmail.com> <466C6801.2080009@codesourcery.com> <84fc9c000706101416o5d86cfc5mef860e3d73732034@mail.gmail.com> <Pine.LNX.4.64.0706111554360.27490@zhemvz.fhfr.qr>

Richard Guenther wrote:

> Results are (x86_64, -Os) 3473918 bytes with the patch and 3473968 without
> (that's a 0.0015% improvement).

That's certainly not a bad result; what it suggests most strongly is
that either (a) the optimization opportunity doesn't occur very often,
or (b) the code size doesn't change much when the optimization occurs.
In either case, there doesn't seem to be any reason to worry about -Os
in this context.

Thanks,

-- 
Mark Mitchell
CodeSourcery
mark@codesourcery.com
(650) 331-3385 x713

References:
- [PING]^2 New if-combining pass
  - From: Richard Guenther
- Re: [PING]^2 New if-combining pass
  - From: Mark Mitchell
- Re: [PING]^2 New if-combining pass
  - From: Richard Guenther
- Re: [PING]^2 New if-combining pass
  - From: Richard Guenther

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