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Author SHA1 Message Date
Simon Pilgrim 2bb41851a1 [Utils] recognizeBSwapOrBitReverseIdiom - support matching from funnel shift roots (PR40058) 
We were missing bitreverse matches in cases where InstCombine had seen a byte-level rotation at the end of a bitreverse sequence (replacing or() with fshl()), hindering the exhaustive bitreverse matching in CodeGenPrepare later on.
 2021-05-04 13:46:45 +01:00
Simon Pilgrim e0dd708f40 [CodeGenPrepare][X86] Add bitreverse detection tests 
Initially only test for XOP which is the only thing that supports scalar bitreverse - we can add vector tests later.
 2021-05-04 13:29:19 +01:00