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Sergey Sharybin cd6129d1ff Cycles: Workaround dead-slow expf() on 64bit linux ...

Single precision exponent on 64bit linux tends to be order of magnitude slower
than double precision version even with single<->double precision conversion.

Some feedback in the mailing lists also suggests that logf() is also slow, but
this i didn't confirm here in the studio yet.

Depending on the shader setup it gives ~3% with the secret agent shot and up to
around 15% with the bmw scene here.

2014-10-06 12:36:46 +02:00

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