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Direction flag : ウィキペディア英語版 | Direction flag The direction flag is a flag that controls the left-to-right or right-to-left direction of string processing,〔(3.8.1 Carry and Direction Flag Control Instructions )〕 stored in the FLAGS register on all x86 compatible CPUs.〔(Direction Flag ) at MSDN〕 It is bit number 10. When it is set to 0 (using the clear-direction-flag instruction ''CLD''),it means that string is processed beginning from lowest to highest address and instructions mode is called ''auto-incrementing'' mode. Both the source index and destination index (like ''MOVS'') will increase them. In case it is set to 1 (using the set-direction-flag instruction ''STD''),the string is processed from highest to lowest address.This is called ''auto-decrementing'' mode . This flag is used to determine the direction (forward or backward) in which several bytes of data will be copied from one place in the memory, to another. The direction is important mainly when the original data position in memory and the target data position overlap. ==References== 〔
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Direction flag」の詳細全文を読む
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