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Re: What is acceptable for -ffast-math? (Was: associative law incombine)
- To: Linus Torvalds <torvalds at transmeta dot com>
- Subject: Re: What is acceptable for -ffast-math? (Was: associative law incombine)
- From: Gabriel Dos_Reis <gdosreis at sophia dot inria dot fr>
- Date: Wed, 1 Aug 2001 19:57:56 +0200 (MEST)
- Cc: <dewar at gnat dot com>, <Theodore dot Papadopoulo at sophia dot inria dot fr>, <amylaar at redhat dot com>, <aoliva at redhat dot com>, <gcc at gcc dot gnu dot org>, <gdr at codesourcery dot com>, <moshier at moshier dot ne dot mediaone dot net>, <tim at hollebeek dot com>, <tprince at computer dot org>
- References: <20010801173821.74323F2B65@nile.gnat.com><Pine.LNX.4.33.0108011039220.20912-100000@penguin.transmeta.com>
| On Wed, 1 Aug 2001 dewar@gnat.com wrote:
| >
| > <<The above rules, btw, only apply for exact IEEE math, and on a number of
| > machines you _will_ see zero for the first one.
| > >>
| >
| > Hello! it was you who restricted the discussion to the x86. If we are allowed
| > to go to other machines, we have lots more examples up our sleeves :-)
|
| Fair enough. But note how I didn't claim that you cannot get a difference
| in the ULP.
0.125 vs. 0.0 isn't a difference in the ULP.
-- Gaby