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Re: ColdFire soft-float optimizations

From: Jim Wilson <wilson at specifixinc dot com>
To: Peter Barada <peter at the-baradas dot com>
Cc: gcc at gcc dot gnu dot org
Date: Sun, 06 Jun 2004 22:30:25 -0700
Subject: Re: ColdFire soft-float optimizations
References: <20040603164211.7803798C8A@baradas.org>

Peter Barada wrote:

As an example, for the absolute value of a SPFP value, the sign bit can
be cleared via an integer instruction instead of having to call out to
the FP library.  This would be valid for all normal SPFP values and
infinity.

This is valid for all numbers, and many targets, including the m68k port, already do this by default. The IEEE FP standard explicitly says that abs can be implemented as a non-arithmetic operation, and hence there is no need to worry about NaNs here. This is in the appendix. -- Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com

References:
- ColdFire soft-float optimizations
  - From: Peter Barada

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