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kanghongxun
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樓主  發(fā)表于: 2019-03-28 09:49
圖片：
各位大神這段指令是什么意思？如圖
小侯
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1樓  發(fā)表于: 2019-03-28 12:05
這是編碼器指令
當S開(kāi)始2的n次方位數中有bit on的話(huà)顯示其位置於D

以我的範例解說(shuō)
S為M0 N為3 D為0
M0 ON 為bit_0
結果為D0=0
若S範圍內沒(méi)有bit on會(huì )跳錯誤
D0會(huì )以最高位Bit為結果
M5 M0 ON
M5為 bit_5
D0=5

而你的程式還加上Z來(lái)做間接定址和使用ZR文件寄存器
所以看起來(lái)比較複雜
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