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This can be observed with the old testcase of CodeGen/X86/pr12312.ll: 47c47 < vorps %ymm0, %ymm1, %ymm0 --- > vorps %ymm1, %ymm0, %ymm0 97c97 < vorps %ymm1, %ymm0, %ymm0 --- > vorps %ymm0, %ymm1, %ymm0 The vector VecIns is populated with all the values from VecInMap. This is done while iterating VecInMap. VecInMap uses a hash of pointer values so the resulting order can vary depending on the memory layout. The fix is to populate the vector VecIns earlier as VecInMap is populated. This is done in DAG traversal order. Fixes <rdar://problem/16398806> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204623 91177308-0d34-0410-b5e6-96231b3b80d8
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