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Author SHA1 Message Date
Philip Reames 675418ebc0 Extend known bits to understand @llvm.bswap
This is a cleaned up patch from the one written by John Regehr based on the findings of the Souper superoptimizer.

When writing tests, I was surprised to find that instsimplify apparently doesn't know how to collapse bit test sequences based purely on known bits. This required me to split my tests across both instsimplify and instcombine.

Differential Revision: http://reviews.llvm.org/D13250

llvm-svn: 249453
2015-10-06 20:20:45 +00:00