What does NOPL do in x86 system?

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  18. Why does leave do “mov esp,ebp” in x86 assembly?
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  21. How to code a far absolute JMP/CALL instruction in MASM?
  22. How to tell the length of an x86 instruction?
  23. LEA or ADD instruction?
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  25. How do GNU assembler x86 instruction suffixes like “.s” in “mov.s” work?
  26. Purpose of ESI & EDI registers?
  27. In x86 what’s difference between “test eax,eax” and “cmp eax,0”
  28. How does the CPU know how many bytes it should read for the next instruction, considering instructions have different lengths?
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