Bomb lab phase_4

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  1. Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
  2. What’s the purpose of the LEA instruction?
  3. What considerations go into predicting latency for operations on modern superscalar processors and how can I calculate them by hand?
  4. Why does the x86-64 / AMD64 System V ABI mandate a 16 byte stack alignment?
  5. Why in x86-64 the virtual address are 4 bits shorter than physical (48 bits vs. 52 long)?
  6. Is a sign or zero extension required when adding a 32bit offset to a pointer for the x86-64 ABI?
  7. Printing floating point numbers from x86-64 seems to require %rbp to be saved
  8. MOVZX missing 32 bit register to 64 bit register
  9. CS:APP example uses idivq with two operands?
  10. Why are signed and unsigned multiplication different instructions on x86(-64)?
  11. What do the E and R prefixes stand for in the names of Intel 32-bit and 64-bit registers?
  12. Why is the address of static variables relative to the Instruction Pointer?
  13. Why is (or isn’t?) SFENCE + LFENCE equivalent to MFENCE?
  14. Distinguishing memory from constant in GNU as .intel_syntax
  15. Why does this MOVSS instruction use RIP-relative addressing? [duplicate]
  16. How to push a 64bit int in NASM?
  17. What are the names of the new X86_64 processors registers?
  18. x64 instruction encoding and the ModRM byte
  19. Assembly registers in 64-bit architecture
  20. Why does the x86-64 GCC function prologue allocate less stack than the local variables?
  21. Does each PUSH instruction push a multiple of 8 bytes on x64?
  22. Can I add 64bit constants to 64bit registers?
  23. How to multiply a register by 37 using only 2 consecutive leal instructions in x86?
  24. What does “rep; nop;” mean in x86 assembly? Is it the same as the “pause” instruction?
  25. x86-64 canonical address?
  26. Why does this code execute more slowly after strength-reducing multiplications to loop-carried additions?
  27. What is callq instruction?
  28. Handling calls to (potentially) far away ahead-of-time compiled functions from JITed code
  29. Why use RIP-relative addressing in NASM?
  30. x86 Assembly pushl/popl don’t work with “Error: suffix or operands invalid”

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