Zhiming Wang <zmwa...@gmail.com> added the comment:
Turns out python 2.7.10 doesn't suffer from the performance issue even when
compiled with stock clang 4.x, and upon further investigation, I tracked down
the commit that introduced the regression:
commit 2c992a0788536087bfd78da8f2c62b30a461d7e2
Author: Benjamin Peterson <benja...@python.org>
Date: Thu May 28 12:45:31 2015 -0500
backport computed gotos (#4753)
So Naoki was right that computed gotos is (solely) to blame here.
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<https://bugs.python.org/issue32616>
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