From: Dave Love <d.love@dl.ac.uk>
To: egcs@cygnus.com
Subject: Re: Optimizations
Date: Mon, 15 Dec 1997 11:29:00 -0000 [thread overview]
Message-ID: <rzqzpm2iez6.fsf@djlvig.dl.ac.uk> (raw)
In-Reply-To: <19971215135439.50575@cerebro.laendle>
>>>>> "Marc" == Marc Lehmann <pcg@goof.com> writes:
Marc> on x86, while -funroll-all-loops is generally a win! (even more
Marc> so that -funroll-loops)
Could someone explain exactly what is the difference between the sort
of loops unrolled by -funroll-all-loops and -funroll-loops? The doc
sentence isn't clear to me and ISTR that grovelling unroll.c wasn't
immediately enlightening. Is it something like for(;;) versus
for(i=1;i<=n;i++)?
BTW, in case the original question fortran-related, at least for
fortran with the default (non-)aliasing model, -fforce-addr can be a
win on x86 as Toon has pointed out. BTW2, the suggestions for [56]86
options with -malign-...=2 are propagated -- bother -- in the g77
manual, AFAIR after the Linux GCC-HOWTO.
next prev parent reply other threads:[~1997-12-15 11:29 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-12-14 14:30 [EGCS] Optimizations meissner
1997-12-15 5:38 ` Optimizations Marc Lehmann
1997-12-15 11:29 ` Dave Love [this message]
1997-12-15 15:43 ` Optimizations Marc Lehmann
[not found] ` <19971216000653.24186.cygnus.egcs@cerebro.laendle>
1997-12-23 7:51 ` Optimizations Stan Cox
-- strict thread matches above, loose matches on Subject: below --
2003-01-15 23:20 optimizations Bonzini
2003-01-16 10:53 ` optimizations Reza Roboubi
2003-01-16 11:03 ` optimizations tm_gccmail
2003-01-16 12:34 ` optimizations Reza Roboubi
2003-02-18 18:13 ` optimizations Håkan Hjort
2003-02-18 18:16 ` optimizations Andrew Pinski
2003-02-18 18:17 ` optimizations Zack Weinberg
2003-02-18 18:40 ` optimizations Håkan Hjort
2003-02-19 5:02 ` optimizations David Edelsohn
2003-01-16 11:53 ` optimizations Paolo Bonzini
2003-01-14 22:58 optimizations Reza Roboubi
2003-01-15 0:15 ` optimizations Andrew Pinski
2003-01-15 5:10 ` optimizations Reza Roboubi
2003-01-15 6:31 ` optimizations Reza Roboubi
2003-01-15 17:37 ` optimizations Andrew Pinski
2003-01-15 17:46 ` optimizations Reza Roboubi
2000-03-10 1:46 Optimizations Virgil Palanciuc
1997-12-09 9:52 Optimizations David M. Ronis
1997-12-09 11:19 ` Optimizations Jeffrey A Law
1997-12-10 10:46 ` [EGCS] Optimizations Marc Lehmann
1997-12-14 5:39 ` Philipp Thomas
1997-12-14 15:14 ` Optimizations Marc Lehmann
1997-12-14 20:14 ` Optimizations Jeffrey A Law
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