Message193412
I can't reproduce this here on OS 10.6 (I don't have access to anything later), but I think I can guess what's happening: I suspect that gcc 4.8 is optimizing the pair of 'cos' and 'sin' calls into a single call to 'cexp'. And then the OS X library implementation of _cexp has buggy behaviour with respect to signs of zeros (this last part is something I've witnessed before, but I forget which version of OS X it was on).
It's easy to work around, by adding a special case for zeros in cmath_rect. It's a bit annoying to have to do so, though. |
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Date |
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2013-07-20 16:45:33 | mark.dickinson | set | recipients:
+ mark.dickinson, rhettinger |
2013-07-20 16:45:33 | mark.dickinson | set | messageid: <1374338733.94.0.588648920846.issue18513@psf.upfronthosting.co.za> |
2013-07-20 16:45:33 | mark.dickinson | link | issue18513 messages |
2013-07-20 16:45:33 | mark.dickinson | create | |
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