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- From: tege@sics.se (Torbjorn Granlund)
- Newsgroups: comp.archives
- Subject: [gnu.gcc.announce] GNU superoptimizer version 2.1 released
- Followup-To: gnu.gcc.announce
- Date: 20 Dec 1992 20:57:28 GMT
- Organization: GNUs Not Usenet
- Lines: 67
- Sender: adam@soda
- Approved: adam@soda
- Distribution: world
- Message-ID: <1h2mnoINN71o@agate.berkeley.edu>
- References: <9212171304.AA24437@zevs.sics.se>
- NNTP-Posting-Host: soda.berkeley.edu
- X-Original-Newsgroups: gnu.gcc.announce
- X-Original-Date: Thu, 17 Dec 1992 15:04:40 GMT
-
- Archive-name: auto/gnu.gcc.announce/GNU-superoptimizer-version-2-1-released
-
- Version 2.1 of the GNU superoptimizer (GSO) is now available for
- anonymous ftp from prep.ai.mit.edu in /pub/gnu/superopt-2.1.tar.Z.
- This version fixes several bugs that were present in the previous
- version. In particular if you use GSO to generate Intel x86 or
- Motorola 68k code, you should upgrade to this version.
-
-
- GSO is a function sequence generator that uses an exhaustive
- generate-and-test approach to find the shortest instruction sequence
- for a given function. You have to tell the superoptimizer which
- function and which CPU you want to get code for.
-
- Sample GSO results:
-
- SPARC code for i5 = ((signed) i0 > (signed) i1):
- subcc %i1,%i0,%i2
- srl %i1,31,%i3
- sra %i0,31,%i4
- addx %i4,%i3,%i5
-
- Faster 80x86 code than the standard cmpl/seta/and for
- ecx = ((unsigned) eax > (unsigned) edx):
- cmpl %eax,%edx
- sbbl %ecx,%ecx
- negl %ecx
-
- MC88000 code for 'find first set bit', i.e., r6 = ffs(r2):
- subu.co r3,r0,r2
- and r4,r3,r2
- addu.ci r5,r4,r4
- ff1 r6,r5
-
- POWER (RS/6000) code for r6 = ((unsigned) r3 < (unsigned) r4) + r5
- sf r6,r4,r3
- sfe r7,r5,r6
- sf r8,r7,r6
-
- Aside from the CPUs in the examples above, GSO generates code for
- MC680x0, Amd290xx, and Pyramid(SP,AP,XP).
-
- Please send comments, improvements and new ports to tege@gnu.ai.mit.edu.
-
-
- Torbjorn Granlund
- Swedish Institute of Computer Science
-
- [ Soon to be at these ftp sites as well. Please try them
- before prep.ai.mit.edu! thanx -gnu@prep.ai.mit.edu
-
- Japan: ftp.cs.titech.ac.jp, utsun.s.u-tokyo.ac.jp:ftpsync/prep
- Australia: archie.oz.au:gnu
- Europe: src.doc.ic.ac.uk:gnu, ftp.informatik.tu-muenchen.de,
- ftp.informatik.rwth-aachen.de:pub/gnu, nic.funet.fi:pub/gnu,
- ugle.unit.no, isy.liu.se, ftp.stacken.kth.se, ftp.win.tue.nl,
- ftp.diku.dk, ftp.eunet.ch, archive.eu.net
- United States: wuarchive.wustl.edu, ftp.cs.widener.edu,
- uxc.cso.uiuc.edu, col.hp.com, gatekeeper.dec.com:pub/GNU,
- ftp.uu.net:systems/gnu
-
- For information on how to order GNU software on tape, check
- the file etc/DISTRIB in the GNU Emacs distribution, or e-mail
- a request to: gnu@prep.ai.mit.edu
- ]
-
-
-