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Commit c5b84a53 authored by Peter Collingbourne's avatar Peter Collingbourne
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Optimize comparisons to empty string. 

Geo-mean performance improvement of 0.2% (-0.3% - 0.9% @ 95% CI).

Differential Revision: http://reviews.llvm.org/D6569

llvm-svn: 223728
parent c8cf2b88
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