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authorRaymond Hettinger <python@rcn.com>2013-07-28 09:39:49 (GMT)
committerRaymond Hettinger <python@rcn.com>2013-07-28 09:39:49 (GMT)
commit77578204d6aeb89a9ee8365f8fb28ce18aa2eb7c (patch)
tree303daae3dfcb80a883facdae7d593e3e099779c3 /Lib/inspect.py
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Restore the data block size to 62.
The former block size traded away good fit within cache lines in order to gain faster division in deque_item(). However, compilers are getting smarter and can now replace the slow division operation with a fast integer multiply and right shift. Accordingly, it makes sense to go back to a size that lets blocks neatly fill entire cache-lines. GCC-4.8 and CLANG 4.0 both compute "x // 62" with something roughly equivalent to "x * 9520900167075897609 >> 69".
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