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Re: Effects of newly introduced -mpcX 80387 precision flag

From: Richard Henderson <rth at redhat dot com>
To: Uros Bizjak <ubizjak at gmail dot com>
Cc: Richard Guenther <richard dot guenther at gmail dot com>, GCC Development <gcc at gcc dot gnu dot org>
Date: Tue, 3 Apr 2007 11:04:53 -0700
Subject: Re: Effects of newly introduced -mpcX 80387 precision flag
References: <5787cf470704030146j75005922qa46e745d024766e7@mail.gmail.com> <84fc9c000704030153y6e6f08fak9c947d62a981fcc5@mail.gmail.com> <5787cf470704030156i58632733l832c71d3345b38bb@mail.gmail.com>

On Tue, Apr 03, 2007 at 10:56:42AM +0200, Uros Bizjak wrote:
> ...  Note that a change of default precision control may
> affect the results returned by some of the mathematical functions.
> 
> to the documentation to warn users about this fact.

Eh.  It can seriously break some libm implementations that
require longer precision.  It's one of the reasons I'm not
really in favour of global switches like this.

r~

References:
- Effects of newly introduced -mpcX 80387 precision flag
  - From: Uros Bizjak
- Re: Effects of newly introduced -mpcX 80387 precision flag
  - From: Richard Guenther
- Re: Effects of newly introduced -mpcX 80387 precision flag
  - From: Uros Bizjak

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