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Author SHA1 Message Date
Simon Pilgrim ac78daf517 {DAGCombiner] Fold (rot x, 0) -> x 
llvm-svn: 307184
 2017-07-05 18:27:11 +00:00
Andrew Zhogin 45d192823e [DAGCombiner] visitRotate patch to optimize pair of ROTR/ROTL instructions into one with combined shift operand. 
For two ROTR operations with shifts C1, C2; combined shift operand will be (C1 + C2) % bitsize.

Differential revision: https://reviews.llvm.org/D12833

llvm-svn: 307179
 2017-07-05 17:55:42 +00:00
Simon Pilgrim d128222f0c [X86] Add combine tests for vector rotates 
Reference tests for D12833

llvm-svn: 307073
 2017-07-04 12:33:53 +00:00