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TempleOSCD_150216.ISO

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Terry A. Davis authored and minexew committed 2018-09-08 21:46:15 +02:00
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Demo/Lectures/64BitAsmQuiz.TXT
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@@ -70,7 +70,7 @@ ANSWERS:
5) The R13 instruction takes one more byte because it is like $LK,"REG_RBP",A="MN:REG_RBP"$ in the ModR.
6) The RAX instruction has a REX byte prefix to specify 64-bit size. So does the R8 instruction, but in the REX is also a flag to specify upper-8 reg. For EAX, there is no need of REX.
6) The R8 instruction needs a REX byte prefix to specify upper-8 reg.
7) You can access the lowest byte of any reg. You can access AH but not the second-to-lowest byte of ESI.