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Re: [wwwdocs] Vectorizer's updates to 4.3.0 changes

From: Andrew Pinski <pinskia at gmail dot com>
To: Andi Kleen <andi at firstfloor dot org>
Cc: Ira Rosen <IRAR at il dot ibm dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>, "andi at firstfloor dot org" <andi at firstfloor dot org>
Date: Tue, 11 Mar 2008 03:47:30 -0700
Subject: Re: [wwwdocs] Vectorizer's updates to 4.3.0 changes
References: <OF83EA34E3.D20A6277-ONC2257409.00305F67-C2257409.003124D3@il.ibm.com> <20080311104132.GA18917@one.firstfloor.org>

Sent from my iPhone

On Mar 11, 2008, at 3:41, Andi Kleen <andi@firstfloor.org> wrote:

+ <li>The <code>-ftree-vectorize</code> option is now on by default under + <code>-O3</code>.
That seems awfully brief. I would recommend you mention at least
e.g. that it needs sse2 or altivec enabled and roughly what the
vectorizer does (in very high level terms for users) and that it may
increase code size.

On some targets (SPU), you don't need an extra option to enable the ability for vectorizer. And it is already documented that -O3 can cause inrease of code size.

Thanks,
Andrew Pinski

References:
- [wwwdocs] Vectorizer's updates to 4.3.0 changes
  - From: Ira Rosen
- Re: [wwwdocs] Vectorizer's updates to 4.3.0 changes
  - From: Andi Kleen

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