Michael Gottesman 1bfdd9e3bf [g-arc-opts] Teach the arc optimizer how to recognize more trap BBs in the stdlib. ...

This reduces the number of retain, release operations in the dylib from 38512 to
16041. That is a reduction of 60%. Most of the code paths affected by this were
in the cocoa part of the stdlib so when I measured the perf test suite I did not
see a huge boost in perf.

rdar://18327670

Swift SVN r21934

2014-09-13 01:42:24 +00:00

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