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# 2bb41851 04-May-2021 Simon Pilgrim <[email protected]>

[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 o

[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.

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# e0dd708f 04-May-2021 Simon Pilgrim <[email protected]>

[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.