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Re: SMS scheduling

From: Richard Henderson <rth at redhat dot com>
To: Mostafa Hagog <MUSTAFA at il dot ibm dot com>
Cc: Canqun Yang <canqun at nudt dot edu dot cn>, gcc at gcc dot gnu dot org, Ayal Zaks <ZAKS at il dot ibm dot com>
Date: Thu, 30 Sep 2004 10:03:35 -0700
Subject: Re: SMS scheduling
References: <20040930084214.GA6698@redhat.com> <OFB76CBD7D.A253EAEA-ONC2256F1F.002FED7D-C2256F1F.0030A978@il.ibm.com>

On Thu, Sep 30, 2004 at 10:51:31AM +0200, Mostafa Hagog wrote:
> > On Thu, Sep 30, 2004 at 10:03:37AM +0200, Mostafa Hagog wrote:
> > > For 4.0 SMS intra-loop memory dependencies are detected using
> > > the alias.c (as in haifa-sched) for inter-loop memory dependencies
> > > we are very conservative and assume that all memory accesses are
> > > aliased.
> >
> > alias.c is flow insensative, and thus as conservative as you
> > could want.  Why aren't you using it all the time?
> 
> The answer is within your question; flow insensitive.
> In SMS we are interested in loop-carried dependancies
> and this is not provided by alias.c.

Certainly, but surely flow insensitive data is better than
assuming all memory accesses are aliased.


r~

References:
- Re: SMS scheduling
  - From: Richard Henderson
- Re: SMS scheduling
  - From: Mostafa Hagog

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