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Re: What is acceptable for -ffast-math? (Was: associative law incombine)
- To: Wolfgang Bangerth <wolfgang dot bangerth at iwr dot uni-heidelberg dot de>
- 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 18:58:40 +0200 (MEST)
- Cc: gcc at gcc dot gnu dot org, tim at hollebeek dot com
- References: <Pine.SOL.4.10.10108011841370.29695-100000@eros>
The transformations in question aren't documented. So, those having
"valid reasons to request them" don't even know what there are
requesting with -fdubious-math.
Right now, we're discussing the ability of the compiler to transform
something like a/b/c into a/(b*c). Some argue on the ground of speed
considerations, that the programmer would expect the compiler to do
that. But then, if they would have written that form in the first
The issue isn't about "freedom vs. no-freedom".