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c9d22d057f
This is really a known bits style transformation, but known bits isn't context sensitive. The particular case which comes up happens to involve a range which allows range based reasoning to eliminate the mask pattern, so handle that case specifically in CVP. InstCombine likes to generate the mask-by-low-bits pattern when widening an arithmetic expression which includes a zext in the middle. Differential Revision: https://reviews.llvm.org/D68811 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@374506 91177308-0d34-0410-b5e6-96231b3b80d8