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1078 Discussions

operand size override prefix(66H)

logicman112
Beginner
‎06-07-2010 08:38 PM
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What operand size override prefix does in 64-bits code segment instructions? and what default operand size mean? We can specify different operand sizes, 8, 16, 32 and 64 by opcode, so what operand size override prefix does(66H)?
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