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Re: ColdFire soft-float optimizations

From: Mike Stump <mrs at apple dot com>
To: Peter Barada <peter at the-baradas dot com>
Cc: gcc at gcc dot gnu dot org
Date: Thu, 3 Jun 2004 16:48:29 -0700
Subject: Re: ColdFire soft-float optimizations

On Thursday, June 3, 2004, at 09:42 AM, Peter Barada wrote:

I'm thinking about a set of optimizations for single precision
floating point(SPFP) on ColdFire cores that don't have an FPU.  These
optimizations make the assumption that the domain of the FP numbers do
not include NaN in any of its forms,

-ffinite-math-only as documented in the manual?

and don't have to set errno.

-fno-math-errno as documented in the manual?

I'm wondering what combination of -ffast-math

This flag turns the above two on, as documented in the manual?

and -funsafe-math-optimizations should to be turned on to enable these
optimizations.

I am not sure that you need this flag, as I am unsure what optimizations you want to do exactly. Maybe someone else can guess, failing that, you'll have to describe each one and then we can chime in. For the optimizations you listed, it didn't sound like you needed to check this flag, but I am not an FP person.

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

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