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This canonicalization step saves us 3 pattern matching possibilities * 4 math ops for scalar FP math that uses xmm regs. The backend can re-commute the operands post-instruction-selection if that makes register allocation better. The tests in llvm/test/CodeGen/X86/sse-scalar-fp-arith.ll cover this scenario already, so there are no new tests with this patch. Differential Revision: http://reviews.llvm.org/D7777 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230024 91177308-0d34-0410-b5e6-96231b3b80d8
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