Find logarithm in cuda

How do I开发者_运维百科 find logarithm in cuda? I'm looking for a device function.

Thanks

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You can use:

logf(x)
__logf(x)
log2f(x)
__log2f(x)
log10f(x)
__log10f(x)

Taken from the CUDA Programming Guide (Appendix D).

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As Ade says log* functions. Keep in mind that __log* might be fast but not accurate.