I'm just reinterpreting the 64-bit integer as a double-precision floating point ... | Hacker News

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		cozzyd on Sept 10, 2015 \| parent \| context \| favorite \| on: A millisecond isn't fast (and how we made it 100x ... I'm just reinterpreting the 64-bit integer as a double-precision floating point number (there are other ways to do this in C, for example using a union).

shanemhansen on Sept 10, 2015 [–]

Java has a type called bytebuffer that might do the trick: http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer...

I don't know how that would get optimized by the jit at runtime though.

jdmichal on Sept 11, 2015 | [–]

Don't be silly. These functions are built into `Float` and `Double`.

http://docs.oracle.com/javase/7/docs/api/java/lang/Double.ht...

http://docs.oracle.com/javase/7/docs/api/java/lang/Double.ht...

Both are marked as native functions in OpenJDK 7:

http://grepcode.com/file/repository.grepcode.com/java/root/j...

http://grepcode.com/file/repository.grepcode.com/java/root/j...

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