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Author SHA1 Message Date
Brian Gesiak 1640e68728 [Analysis] bitreverse(undef) returns undef 
Summary:
The reverse of an artbitrary bitpattern is also an arbitrary
bitpattern.

Reviewers: trentxintong, arsenm, majnemer

Reviewed By: majnemer

Subscribers: majnemer, wdng, llvm-commits

Differential Revision: https://reviews.llvm.org/D31118

llvm-svn: 298201
 2017-03-19 04:40:42 +00:00
Matt Arsenault 155dda9134 Implement constant folding for bitreverse 
llvm-svn: 263945
 2016-03-21 15:00:35 +00:00
James Molloy 2d09c00b91 [InstCombine] Add trivial folding (bitreverse (bitreverse x)) -> x 
There are plenty more instcombines we could probably do with bitreverse, but this seems like a very obvious and trivial starting point and was brought up by Hal in his review.

llvm-svn: 252879
 2015-11-12 12:39:41 +00:00