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Given a FMA family (e.g., 213, 231), not all the variants (i.e., register or memory) are commutable. E.g., for the 213 family (with the syntax src1, src2, src3): fmaXXX213 A, B, reg3/mem3 == fmaXXX213 B, A, reg3/mem3 Now consider the 231 family: fmaXXX231 A, B, reg3 == fmaXXX231 A, reg3, B But fmaXXX231 A, B, mem3 != fmaXXX231 A, mem3, B Indeed, mem3 cannot be the second argument of the memory variant of fmaXXX231. Working on a reduced test case! <rdar://problem/16800495> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208252 91177308-0d34-0410-b5e6-96231b3b80d8
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