Path: utzoo!telly!ddsw1!mcdchg!rutgers!mailrus!eecae!cps3xx!usenet
From: usenet@cps3xx.UUCP (Usenet file owner)
Newsgroups: gnu.gcc
Subject: Re: GCC performance (+ sample code)
Message-ID: <727@cps3xx.UUCP>
Date: 27 Sep 88 18:07:28 GMT
References: <16219@shemp.CS.UCLA.EDU>
Organization: Engineering, Michigan State U., E. Lansing MI
Lines: 14
In-reply-to: arman@oahu.cs.ucla.edu's message of 27 Sep 88 06:15:59 GMT


  The problem is that GCC is putting an "andb #x0c, cc" into the inner
loop.  I don't have time to delve into the mysteries of the code, but
it seems to be caused by something (???) setting the CC_NO_OVERFLOW
flag, so that gcc thinks it has to mask off some bits.
  If there are any gcc gurus out there, does someone want to look into
this?  I looked through the m68k.md and tm-m68k.h files, but there's
just too much going on.
  If you take out the "andb" they're both just as fast, by the way.

+----------------------------------+------------------------+
| Anton Rang (grad student)	   | "VMS forever!"	    |
| Michigan State University	   | rang@cpswh.cps.msu.edu |
+----------------------------------+------------------------+