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Re: 3.3 vs 3.1 on powerpc
- From: Devang Patel <dpatel at apple dot com>
- To: Brad Lucier <lucier at math dot purdue dot edu>
- Cc: gcc at gcc dot gnu dot org, feeley at iro dot umontreal dot ca
- Date: Fri, 22 Nov 2002 11:17:28 -0800
- Subject: Re: 3.3 vs 3.1 on powerpc
On Thursday, November 21, 2002, at 06:18 PM, Brad Lucier wrote:
I've been doing some tests of 3.3 versus (Apple's) 3.1 on PowerPC
Darwin.
With -fnew-ra and the new scheduler, I'm expecting 3.3 to kick serious
butt
compared to 3.1 on some of my floating-point codes---studying the
scheduler
output indicates a 50%+ improvement when scheduled for -mcpu=7400.
(For
some reason, the scheduler has a more difficult time with -mcpu=7450.)
Some of this speedup results from fewer spills.
Unfortunately, I can't figure out how to get mainline 3.3 to accept
some
of Apple's headers, so I can't actually run anything yet ... ;-).
Framework header's support is not available in FSF gcc.
However, you can checkout gcc3 from Darwin CVS. Geoff just finished
merge
with FSF mainline. (We have not yet fully qualified it for release, yet)
-Devang