Hi all, In addition to vorlon's comments on this debian bug:
http://bugs.debian.org/367048 I got these comments on IRC: <pabs> vorlon: are there any other platforms than alpha where -ffast-math is known to break code? <Sesse> pabs: -ffast-math can break code easily <ifvoid> pabs: many code is broken by -ffast-math <Sesse> that's why it's not part of any -O option <ifvoid> it used to break mozilla, for exmaple <ifvoid> (not sure if it still does) <pabs> so, to be avoided everywhere? <ifvoid> pabs: except for very specialized apps, yes <ifvoid> I tend to use it for my numerical progs <ifvoid> it's really only useful if you have to do many cos() or pow() or so <pabs> hmm, I wonder if a complex 2D animation renderer counts (http://www.synfig.com) <ifvoid> and if you don't care about range checking <pabs> I shall talk to upstream, thanks all <ifvoid> I usually disable it in any package builds <mrvn> doesn't -ffast-math only circumvent the extra redirection for libm calls? <Sesse> mrvn: no <ifvoid> mrvn: it disables range checking <ifvoid> for negative input of log(), for example <ifvoid> and disables checking for inf and nan and such things <mrvn> on cpus that don't have that in hardware <Sesse> ifvoid: it also replaces functions with odd macros <Sesse> ifvoid: some of which have reduced argument range and precision <pabs> Sesse/ifvoid/mrvn: mind if I paste this stuff to my upstream? <ifvoid> pabs: go ahead <ifvoid> pabs: the gcc info page is pretty informative, too <ifvoid> sec 3.10 <Sesse> pabs: np darco: * is there a reason -ffast-math is used by default in synfig? * if it is, any ideas about how to disable it on some platforms? linux-alpha being one of them. -- bye, pabs http://wiki.debian.org/PaulWise
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