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Re: What is acceptable for -ffast-math? (Was: associative law in combine)
- To: Theodore dot Papadopoulo at sophia dot inria dot fr, tim at hollebeek dot com
- Subject: Re: What is acceptable for -ffast-math? (Was: associative law in combine)
- From: dewar at gnat dot com
- Date: Wed, 1 Aug 2001 13:05:13 -0400 (EDT)
- Cc: amylaar at redhat dot com, aoliva at redhat dot com, dewar at gnat dot com,gcc at gcc dot gnu dot org, gdr at codesourcery dot com,moshier at moshier dot ne dot mediaone dot net, torvalds at transmeta dot com,tprince at computer dot org
<<Exactly ... and it isn't at all rare that the programmer knows exactly
how much noise is in the input data (little or none) and the how much
accuracy he expects in the result (as much as possible!).
No, no, "as much as possible" is often quite wrong. There are stable algorithms
that become unstable with unexpected extra precision.