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"%z = %x and %y". If GVN can prove that %y equals %x, then it turns this into "%z = %x and %x". With the new code, %z will be replaced with %x everywhere (and then deleted). Previously %z would be value numbered too, which is a waste of time. Also, while a clever value numbering algorithm would give %z the same value number as %x, our current one doesn't do so (at least I don't think it does). The new logic has an essentially equivalent effect to what you would get if %z was given the same value number as %x, i.e. it should make value numbering smarter. While there, get hold of target data once at the start rather than a gazillion times all over the place. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118923 91177308-0d34-0410-b5e6-96231b3b80d8
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