Björn Steinbrink aa670fe91e Use a lookup table to speed up float parsing ...

The pow() function is pretty expensive, so creating a small lookup
table for the first few negative powers of ten provides a big speedup.

Parse times for some large .obj files (without asan):

        File A  File B  File C
Before  2500ms   573ms   545ms
After   1239ms   294ms   271ms

2016-10-24 12:15:42 +02:00

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