Date: Sat, 7 Jun 1997 07:48:47 +1000 From: Bruce Evans <bde@zeta.org.au> To: craig@gnofn.org, hackers@FreeBSD.ORG Subject: Re: gcc -m486, gcc -O2 Message-ID: <199706062148.HAA16814@godzilla.zeta.org.au>
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>Is -m486 desireable/useful on various flavors of 586-class >chips? Specifically curious about AMD K5. It is sometimes a pessimization on 486's and often a pessimization on 586's. `-m486 -malign-functions=2 -mailign-jumps=2 -malign-loops=2' may be best on 586's. >Is there any reason -O2 would not be a good idea for kernel/make >world in make.conf? I notice that the suggested use is -O2 for >everything else and -O for the kernel. -O2 is sometimes a pessimization. `-O2 -m486' was suggested in 1994. It is wronger now. Bruce
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