Comment #12 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
Your implementation seems to have minor flaws. Open the test page and try
this in the devtools console:
Math.log2(8) // Check that we are indeed using your implementation
2.9999999999999996
log2(8)
3
log2(_ConstructDouble(0, 512)) // Should return -1065
-1064.9999999999998
I haven't looked closer into this. Maybe this is working as intended? For
some reason, the test framework does not catch this.
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