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Author SHA1 Message Date
Rui Ueyama 0fcbb2893e Revert r301487: Replace HashString algorithm with xxHash64 
This reverts commit r301487 to make buildbots green.

llvm-svn: 301491
 2017-04-26 23:15:10 +00:00
Rui Ueyama 87b30ac9d3 Replace HashString algorithm with xxHash64 
The previous algorithm processed one character at a time, which is very
painful on a modern CPU. Replace it with xxHash64, which both already
exists in the codebase and is fairly fast.

Patch from Scott Smith!

Differential Revision: https://reviews.llvm.org/D32509

llvm-svn: 301487
 2017-04-26 22:45:04 +00:00
Rafael Espindola eaeb6d91a1 Add xxhash to llvm. 
It will be used for fast fingerprinting in lld at least.

llvm-svn: 282493
 2016-09-27 15:45:57 +00:00