maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
216,033 Commits 23 Branches 0 Tags 2.2 GiB
Commit Graph

5 Commits

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
Simon Pilgrim 23a29dafda [X86][SSE] Tidied up vector CTLZ/CTTZ. NFCI. 
llvm-svn: 242645
 2015-07-19 17:09:43 +00:00
Simon Pilgrim c789e1d57b [DAGCombiner] Added CTTZ vector constant folding support. 
llvm-svn: 239293
 2015-06-08 09:57:09 +00:00
Simon Pilgrim 856fc94a2f [X86] Added tzcnt vector tests. 
llvm-svn: 239264
 2015-06-07 21:01:34 +00:00