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At the moment we expect rotates to have the form: (or (shl X, Y), (shr X, Z)) where Y == bitsize(X) - Z or Z == bitsize(X) - Y. This form means that the (or ...) is undefined for Y == 0 or Z == 0. This undefinedness can be avoided by using Y == (C * bitsize(X) - Z) & (bitsize(X) - 1) or Z == (C * bitsize(X) - Y) & (bitsize(X) - 1) for any integer C (including 0, the most natural choice). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198861 91177308-0d34-0410-b5e6-96231b3b80d8
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