Re: alias analysis (was Loop Optimizations and Gotos)

jfc@mit.edu (John Carr)
12 Dec 1995 14:33:58 -0500

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From: jfc@mit.edu (John Carr)
Newsgroups: comp.compilers
Date: 12 Dec 1995 14:33:58 -0500
Organization: Massachusetts Institute Of Technology
References: 95-11-198 95-11-228 95-12-044
Keywords: C, Fortran, optimize, comment

Dave Lloyd <dave@occl-cam.demon.co.uk> wrote:


>Well it seems to me that C could easily acquire a new "storage-class",
>say "independent" (after the HPF equivalent) which when applied to a
>pointer means "the storage at the end of this pointer is only
>accessible via this pointer within this scope".


The draft ANSI C standard had this feature (called "noalias" instead
of "independent"). It was withdrawn after strong objection (I don't
remember all the reasons, but lack of existing implementations was one).


--
        John Carr (jfc@mit.edu)
[Inability to define the semantics was the other. -John]
--


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