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Min/max canonicalization (r287585) exposes the fact that we're missing combines for min/max patterns. This patch won't solve the example that was attached to that thread, so something else still needs fixing. The line between InstCombine and InstSimplify gets blurry here because sometimes the icmp instruction that we want to fold to already exists, but sometimes it's the swapped form of what we want. Corresponding changes for smax/umin/umax to follow. Differential Revision: https://reviews.llvm.org/D27531 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289855 91177308-0d34-0410-b5e6-96231b3b80d8
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