Path: utzoo!mnetor!uunet!ncc!alberta!att-ih!ihnp4!skep2!wcs
From: wcs@skep2.ATT.COM (Bill.Stewart.<ho95c>)
Newsgroups: comp.sys.att
Subject: Re: C compilers for the 3B2
Message-ID: <65@skep2.ATT.COM>
Date: 24 Apr 88 14:53:12 GMT
References: <546@vsi.UUCP> <552@vsi.UUCP> <2575@mibte.UUCP> <570@vsi.UUCP>
Reply-To: wcs@skep2.UUCP (46323-Bill.Stewart.<ho95c>,2G218,x0705,)
Organization: AT&T Bell Labs Center 4632, Holmdel, NJ
Lines: 19

:< The 4.2 C compiler  on the 3B2 can optimize code for faster performance. 
:< The code generated in many cases is noticeably faster than 4.1 generated code.
:< Possibly 50% faster (NO PROMISES).
:Does anybody know if AT&T is shipping
:C Programming Utilities 4.2 (CPLU 4.2) and what the PEC is?  

Call 1-800-828-UNIX, the UNIX Software Sales office.
Things the compiler does well included inlining function calls
and generating real code for floating point instead of subroutine calls
to routines which check for the MAU and then execute or emulate.
I think it also takes a lot more advantage of 32100 features, so it
generates code that won't run on 32000s.  Floating point code, and code
that uses lots of small subroutines, will improve drastically.
Generated code is a bit bigger as well, but it's normally worthwhile.
-- 
#				Thanks;
# Bill Stewart, AT&T Bell Labs 2G218, Holmdel NJ 1-201-949-0705 ihnp4!ho95c!wcs
# skep2 is a local machine I'm trying to turn into a server.  Please send
# mail to ho95c or ho95e instead.  Thanks.