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Re: What is acceptable for -ffast-math? (Was: associative law incombine)
- To: Gabriel Dos Reis <gdr at codesourcery dot com>
- Subject: Re: What is acceptable for -ffast-math? (Was: associative law incombine)
- From: Linus Torvalds <torvalds at transmeta dot com>
- Date: Wed, 1 Aug 2001 11:55:21 -0700 (PDT)
- cc: Theodore Papadopoulo <Theodore dot Papadopoulo at sophia dot inria dot fr>, <dewar at gnat dot com>, <amylaar at redhat dot com>, <aoliva at redhat dot com>, <gcc at gcc dot gnu dot org>, <moshier at moshier dot ne dot mediaone dot net>, <tprince at computer dot org>
On 1 Aug 2001, Gabriel Dos Reis wrote:
> |
> | That's not a definition.
>
> Do you have one?
>
> Changing 0.125 to 0.0 is a dramatic change.
Not actually necessarily.
Remember: in order to get that difference you had to be operating with
values in the 2**1024 range.
Compared to those values, the difference between 0.0 and 0.125 can often
be considered truly insignificant.
What "often" means depends on what you're doing with the values, of
course.
Linus