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Loading Multiple Base Registers

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Programmer Responsibilities Tell the assembler which registers to choose when creating base/displacement addresses X DS CL5 ==> C008 (BDDD) Do this with USING: USING *,R12 Load the base register with the correct address

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Loading a Single Register Address X‘1000’ BASR R12,R0 USING *,R12 X’1002’...

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Why is this Incorrect? Address USING *,R12 X’1000’ BASR R12,R0 X’1002’...

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Loading Multiple Registers Address X‘1000’ BASR R12,R0 USING *,R12,R11,R10 X’1002’ LA R10,2048 LA R11,2048(R12,R10) LA R10,2048(R11,R10) Remember that X’1000’ = 4096 X’800’ = 2048

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Direction It would be helpful to understand the terms Domain and Range as they relate to USINGs. Also, read about the DROP directive

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