Xref: utzoo comp.lang.c:10325 comp.lang.fortran:685
Path: utzoo!attcan!uunet!husc6!bloom-beacon!gatech!amdcad!tim
From: tim@amdcad.AMD.COM (Tim Olson)
Newsgroups: comp.lang.c,comp.lang.fortran
Subject: Re: no noalias not negligible - a difference between C and Fortran - long
Message-ID: <21727@amdcad.AMD.COM>
Date: 23 May 88 16:34:21 GMT
References: <54080@sun.uucp> <7879@alice.UUCP>
Reply-To: tim@amdcad.UUCP (Tim Olson)
Organization: Advanced Micro Devices
Lines: 13

In article <7879@alice.UUCP> ark@alice.UUCP writes:
| I don't really think there's much here that noalias would help:
| the object code has to fetch dy[i], add da, multiply by
| dx[i], and store it in dy[i] and aliasing is irrelevant to
| each of these operations.

But that forces each iteration of the loop to be performed sequentially.
I believe the original intent was to guarantee non-overlapping arrays to
allow vector machines to compute the loop iterations in parallel.

	-- Tim Olson
	Advanced Micro Devices
	(tim@amdcad.amd.com)