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*From*: Gabriel Dos Reis <gdr at integrable-solutions dot net>*To*: "Kaveh R. Ghazi" <ghazi at caip dot rutgers dot edu>*Cc*: gcc-patches at gcc dot gnu dot org, roger at eyesopen dot com*Date*: 27 Aug 2002 06:05:41 +0200*Subject*: Re: [PATCH] Perform constant folding of math builtins*Organization*: CodeSourcery, LLC*References*: <200208261945.PAA09170@caip.rutgers.edu> <m37kid9xfy.fsf@soliton.integrable-solutions.net> <200208262102.RAA07405@caip.rutgers.edu>

"Kaveh R. Ghazi" <ghazi@caip.rutgers.edu> writes: | > From: Gabriel Dos Reis <gdr@integrable-solutions.net> | > | > "Kaveh R. Ghazi" <ghazi@caip.rutgers.edu> writes: | > | > | Assuming I remembered everything correctly, these are mathematical | > | identities. But I'm not sure which if any are valid/invalid in the | > | presence of NaNs, etc. | > | > Well, I'm not sure we want to restart the discussion about what | > -funsafe-transformations should mean, but if we were to consider all | > those mentioned transformations (which are valid under appropriate | > conditions) I think we ought to clearly state what we want | > -funsae-transformation to do. | > -- Gaby | | The descriptions of the various fast math flags in invoke.texi | (including -funsafe-math-optimizations if that's what you meant) are | all pretty explicit and clear IMHO. I don't think I agree with you that the documentation is explicit and clear. For example, it doesn't appear to me as explicit and clear that the description of "-ffast-mast" does consider the divergences in IEEE-754 and ISO rules, notably between IEEE-754 and LIA-1, or divergences between IEEE-754 specifications and ISO C specifications. Ditto for "-funsafe-math-optimizations". | If an FP expert would comment on that, I'd be grateful. I can't find why the above strikes me as excluding me from the set of "FP expert". Oh, well. -- Gaby

**Follow-Ups**:**Re: [PATCH] Perform constant folding of math builtins***From:*Kaveh R. Ghazi

**References**:**Re: [PATCH] Perform constant folding of math builtins***From:*Kaveh R. Ghazi

**Re: [PATCH] Perform constant folding of math builtins***From:*Gabriel Dos Reis

**Re: [PATCH] Perform constant folding of math builtins***From:*Kaveh R. Ghazi

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