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Re: GCC floating point usage
- From: Geoff Keating <geoffk at geoffk dot org>
- To: dje at watson dot ibm dot com
- Cc: zack at codesourcery dot com, mark at codesourcery dot com, gcc-patches at gcc dot gnu dot org
- Date: Tue, 25 Feb 2003 17:01:39 -0800
- Subject: Re: GCC floating point usage
- References: <20021016223645.GE15067@codesourcery.com> <200302252303.SAA32150@makai.watson.ibm.com>
> Cc: Mark Mitchell <mark at codesourcery dot com>, Geoff Keating <geoffk at geoffk dot org>,
> gcc-patches at gcc dot gnu dot org
> Date: Tue, 25 Feb 2003 18:03:47 -0500
> From: David Edelsohn <dje at watson dot ibm dot com>
> The PowerPC *BSD developers started discussing how to avoid using
> FPRs for integer moves. Richard Earnshaw suggested bumping up
> MEMORY_MOVE_COST for FLOAT class and integer mode. I needed to increase
> the cost quite high, but it does work.
Just out of interest, do you have any numbers indicating the effect of
this on performance? It'd be nice to know if it really helps (or
really hurts).
--
- Geoffrey Keating <geoffk at geoffk dot org>