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Author SHA1 Message Date
Simon Pilgrim d0448ee59f [X86][SSE] Vectorize CTTZ + CTTZ_ZERO_UNDEF 
Now that we have fast vector CTPOP implementations we can use this to speed up vector CTTZ using the pattern (cttz(x) = ctpop((x & -x) - 1))

Additionally, for AVX512CD that provides lzcnt instructions we can use the pattern (cttz_undef(x) = (width - 1) - ctlz(x & -x))

Differential Revision: http://reviews.llvm.org/D12663

llvm-svn: 248091
 2015-09-19 13:22:57 +00:00
Simon Pilgrim 5cce4381ab [X86] Updated vector tzcnt tests. Added vec512 tests. 
llvm-svn: 246922
 2015-09-05 10:19:07 +00:00