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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