Comment #13 on issue 3579 by [email protected]: Math.log2 and Math.log10
should be exact for exact powers
https://code.google.com/p/v8/issues/detail?id=3579
Found the bug and fixed it. However, for some reason test-log2.html still
doesn't have the fixed version. Just look at
https://github.com/rtoy/fdlibm-js/commit/f3b4affd43754eb0ef71264bac0665bd952f7950
for the fix. (Be sure to use the gh-pages branch.)
With this fix I do get -1065. Pretty sure this will fix any of the other
subnormal cases. It is troubling that the test framework doesn't catch
this.
We will probably want to add some more tests.
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