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When the destination operand is the same as the first source register operand for arithmetic instructions, the destination operand may be omitted. For example, the following two instructions are equivalent: sub r2, r2, #6 sub r2, #6 rdar://9682597 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133925 91177308-0d34-0410-b5e6-96231b3b80d8
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