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75a2ce3271
Extend the reassociation optimization of http://reviews.llvm.org/rL240361 (D10460) to SSE scalar FP SP adds in addition to AVX scalar FP SP adds. With the 'switch' in place, we can trivially add other opcodes and test cases in future patches. Differential Revision: http://reviews.llvm.org/D10975 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241515 91177308-0d34-0410-b5e6-96231b3b80d8
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