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Re: PPC optimisations
- To: laire at popmail dot owl dot de
- Subject: Re: PPC optimisations
- From: David Edelsohn <dje at watson dot ibm dot com>
- Date: Thu, 27 Apr 2000 16:51:06 -0400
- cc: Clinton Popetz <cpopetz at cygnus dot com>, gcc at gcc dot gnu dot org
It still is not clear to me whether you are referring to the
gcc-2.95 releases on which Franz Sirl's PowerPC Linux RPMs are based or to
the gcc development sources. When you refer to snapshots, do you mean the
GCC snapshots or Franz Sirl's snapshots? It was my understanding that
Franz Sirl's snapshots were tracking the gcc-2.95 release branch.
To where have you sent "bug reports" about missed optimization
opportunities? To the Franz Sirl and the PowerPC Linux mailinglists or to
the GCC mailinglists or both?
When you discuss missed PowerPC optimizations when compared to
x86, are you referring to architecture-specific optimizations or generic
compiler transformations which have more impact on RISC architectures than
CISC architectures?
Cygnus currently is implementing a number of optimizations in the
PowerPC target of GCC under contract from IBM, such as scheduled prologue
and epilogue, better use of condition registers, and others which will
continue to be implemented over the coming year.
As Clint said, it is very difficult to respond to your statements
or try to improve GCC when everything is described in the abstract.
Regards, David