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* Add more tests for log functions. A few are commented out because thedas2013-06-031-1/+114
| | | | | | long double versions don't pass yet. (They are rather nit-picky cases, so there's ongoing discussion with Bruce about whether it is worth the performance cost.)
* Factor out some common code from the libm tests. This is a bit messydas2013-06-021-14/+2
| | | | | | | | because different tests have different ideas about what it means to be "close enough" to the right answer, depending on the properties of the function being tested. In the process, I fixed some warnings and added a few more 'volatile' hacks, which are sufficient to make all the tests pass at -O2 with clang.
* Add some tests for corner cases of log() in unusual rounding modes.das2011-10-151-2/+29
| | | | I wrote these ages ago, but they've been failing until now.
* signbit() returns nonzero for negative arguments, but we shouldn't assumedas2010-12-061-1/+1
| | | | that it always returns the same nonzero value.
* Add regression tests for logarithmic functions in the math library.das2010-12-051-0/+158
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