Re: PII/PPro specific code generation

Jason Merrill <jason@cygnus.com>
4 Oct 1998 01:15:49 -0400

          From comp.compilers
Related articles
PII/PPro specific code generation comments@cygnus-software.com (Bruce Dawson) (1998-09-18)
Re: PII/PPro specific code generation plakal@cs.nospam.wisc.edu (Manoj Plakal) (1998-09-22)
Re: PII/PPro specific code generation jason@cygnus.com (Jason Merrill) (1998-10-04)
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From: Jason Merrill <jason@cygnus.com>
Newsgroups: comp.compilers
Date: 4 Oct 1998 01:15:49 -0400
Organization: Cygnus Solutions, Sunnyvale, CA
References: 98-09-075 98-09-113
Keywords: C, architecture, optimize

>>>>> Manoj Plakal <plakal@cs.nospam.wisc.edu> writes:


  > You could take a look at PGCC from the Pentium Compiler Group
  > at www.gcc.ml.org. This is being used by the EGCS people
  > (GCC2 offshoot, www.cygnus.com/egcs).


To clarify, PGCC is based some work Intel did a while back to implement
Pentium optimizations in GCC. Unfortunately, that work was not suitable
for inclusion in the mainline compiler, for two reasons:


1) It was buggy; it was done mainly as a proof of concept, and some
      optimizations produced bad code. I believe these problems have been
      fixed by the PGCC folks.
2) It was insufficiently general, and broke optimizations for other
      targets.


The PGCC optimizations are slowly being cleaned up and added to EGCS.


Jason

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