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This patch refactors the logic in collectLoopUniforms and collectValuesToIgnore, untangling the concepts of "uniform" and "scalar". It adds isScalarAfterVectorization along side isUniformAfterVectorization to distinguish the two. Known scalar values include those that are uniform, getelementptr instructions that won't be vectorized, and induction variables and induction variable update instructions whose users are all known to be scalar. This patch includes the following functional changes: - In collectLoopUniforms, we mark uniform the pointer operands of interleaved accesses. Although non-consecutive, these pointers are treated like consecutive pointers during vectorization. - In collectValuesToIgnore, we insert a value into VecValuesToIgnore if it isScalarAfterVectorization rather than isUniformAfterVectorization. This differs from the previous functionaly in that we now add getelementptr instructions that will not be vectorized into VecValuesToIgnore. This patch also removes the ValuesNotWidened set used for induction variable scalarization since, after the above changes, it is now equivalent to isScalarAfterVectorization. Differential Revision: https://reviews.llvm.org/D22867 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277460 91177308-0d34-0410-b5e6-96231b3b80d8
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