When you take notes, use the acronym ‘SQ3R’ to help you do so. This stands for: Survey, Question, Read and Recite. The survey is the first step and involves looking at the titles and sub-headings of each paragraph. Write down a summary of what it’s about, then underline or highl...
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在Thumb模式下,符号将寄存器扩展到64位(设置所有位=符号位) 使用算术右移31或32将符号位-1或0复制到新寄存器中: mov r1, r9 @ move to a low register to be usable as an operandasrs r0, r1, #31 @ generate -1 or 0 in R0 depending on sign of R1 ...