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[X86] Change register&memory TEST instructions from MRMSrcMem to MRMD…
…stMem Summary: Intel documentation shows the memory operand as the first operand. But we currently treat it as the second operand. Conceptually the order doesn't matter since it doesn't write memory. We have aliases to parse with the operands in either order and the isel matching is commutable. For the register®ister form order does matter for the assembly parser. PR22995 was previously filed and fixed by changing the register®ister form from MRMSrcReg to MRMDestReg to match gas. Ideally the memory form should match by using MRMDestMem. I believe this supercedes D38025 which was trying to switch the register®ister form back to pre-PR22995. Reviewers: aymanmus, RKSimon, zvi Reviewed By: aymanmus Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D38120 llvm-svn: 314639
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