Add perf tests for 32 and 64-bit integer divide operations. Looks like 64-bit ops can take around 25-35ns on our 2.4GHz Westmere chips. 32-bit ops are much faster (~5ns).
Add perf tests for 32 and 64-bit integer divide operations. Looks like
64-bit ops can take around 25-35ns on our 2.4GHz Westmere chips. 32-bit
ops are much faster (~5ns).

The takeaway: avoid 64-bit divides in really hot code paths.

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