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When we fold "mul ((add x, c1), c1)" -> "add ((mul x, c2), c1*c2)", we bail if (add x, c1) has multiple users which would result in an extra add instruction. In such cases, this patch adds a check to see if we can eliminate a multiply instruction in exchange for the extra add. I also added the capability of doing the existing optimization with non-splatted vectors (splatted also works). Differential Revision: http://reviews.llvm.org/D13740 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251028 91177308-0d34-0410-b5e6-96231b3b80d8
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