[PATCH] D88578: [InstCombine] recognizeBSwapOrBitReverseIdiom - support for 'partial' bswap patterns (PR47191)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: llvm/test/Transforms/InstCombine/bswap.ll:382
+; CHECK-NEXT:    [[TMP6:%.*]] = or i64 [[TMP3]], [[TMP5]]
+; CHECK-NEXT:    ret i64 [[TMP6]]
 ;
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We would have reduced this to bswap+mask but InstCombinerImpl::matchBSwap is too harsh at filtering out or(A,B) patterns where A and B have different opcodes.


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  https://reviews.llvm.org/D88578/new/

https://reviews.llvm.org/D88578