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Ira Rosen <IRAR@il.ibm.com> writes: > Andi Kleen <andi@firstfloor.org> wrote on 11/03/2008 13:21:22: > >> On Tue, Mar 11, 2008 at 06:50:51AM -0400, Jakub Jelinek wrote: >> > On Tue, Mar 11, 2008 at 11:41:32AM +0100, Andi Kleen wrote: >> > You don't need sse2 nor altivec enabled (though of course vectorization > is >> > better if you do). Consider say: >> >> I was actually aware of the integer vectorizations, but I expect you'll >> only get significant benefits from the vectorizer with SSE2 (on x86 at > least). >> Ira mentioned this for PPC/Altivec too. So while you're technically > correct >> I expect for high level documentation purposes recommending SSE2/Altivec >> would be still the right thing and most helpful to the users. > > Is this better? > > Ira > > Index: changes.html > =================================================================== > RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-4.3/changes.html,v > retrieving revision 1.102 > diff -c -p -r1.102 changes.html > *** changes.html 28 Feb 2008 00:53:41 -0000 1.102 > --- changes.html 12 Mar 2008 07:15:55 -0000 > *************** > *** 154,159 **** > --- 154,164 ---- > <code>-fno-signed-zeros</code>, as it enables reassociation and thus > may introduce or remove traps.</li> > > + <li>The <code>-ftree-vectorize</code> option is now on by default > under > + <code>-O3</code>. In order to generate code for a SIMD extension, it > + has to be specified as well: use <code>-maltivec</code> for PowerPC > + platforms and <code>-msse/-msse2</code> for i?86 and x86_64. You should not need -msse/-msse2 for x86-64 at all since that is the default. If you do not this, I would consider it a bug. Andreas -- Andreas Jaeger, Director Platform / openSUSE, aj@suse.de SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg) Maxfeldstr. 5, 90409 Nürnberg, Germany GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126
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