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Re: egcs 971122 bug compiling bzip2 with -O2 -funroll-loops
- To: Daniel Eisenbud <eisenbud at cs dot swarthmore dot edu>
- Subject: Re: egcs 971122 bug compiling bzip2 with -O2 -funroll-loops
- From: Jeffrey A Law <law at cygnus dot com>
- Date: Thu, 27 Nov 1997 11:30:30 -0800
- cc: egcs at cygnus dot com
- Reply-To: law at cygnus dot com
In message <19971125213126.13607@cs.swarthmore.edu>you write:
> compiled with a simple ./configure; make bootstrap. BTW, does that turn
> on the Haifa scheduler? Should it be on for best performance? And what
> flags should I use to generate optimal code for an UltraSparc?
Haifa is only enabled by default on the HPPA right now; we'll be enabling
it by default for more targets after the first release.
To enable haifa on other targets you need to configure with --enable-haifa.
The Haifa scheduler will probably help the PA, Alpha & rs6000/ppc; other
ports will likely need to be re-tuned for Haifa.
Sorry, I don't know what flags you should use for optimal UltraSparc
performance.
Jeff