When and why do we sign extend and use cdq with mul/div?

by

More Related Contents:

  1. Why should EDX be 0 before using the DIV instruction?
  2. Assembly Language – How to do Modulo?
  3. How do I print an integer in Assembly Level Programming without printf from the c library?
  4. How do AX, AH, AL map onto EAX?
  5. What does multicore assembly language look like?
  6. Basic use of immediates vs. square brackets in YASM/NASM x86 assembly
  7. What does `rep ret` mean?
  8. Why isn’t my root directory being loaded? (FAT12)
  9. execve shellcode writing segmentation fault
  10. Legacy BIOS bootloader to bootstrap real-mode code in second stage
  11. Why is imul used for multiplying unsigned numbers?
  12. double condition checking in assembly
  13. What does “DS:[40207A]” mean in assembly?
  14. What does NOPL do in x86 system?
  15. What do the brackets mean in NASM syntax for x86 asm?
  16. What does the dollar sign ($) mean in x86 assembly when calculating string lengths like “$ – label”? [duplicate]
  17. Why not store function parameters in XMM vector registers?
  18. Why flush the pipeline for Memory Order Violation caused by other logical processors?
  19. Why does leave do “mov esp,ebp” in x86 assembly?
  20. Using ymm registers as a “memory-like” storage location
  21. When should I use size directives in x86?
  22. How to code a far absolute JMP/CALL instruction in MASM?
  23. How to tell the length of an x86 instruction?
  24. LEA or ADD instruction?
  25. What does the “rep stos” x86 assembly instruction sequence do?
  26. SAR command in X86 assembly with one parameter
  27. Addressing Modes in Assembly Language (IA-32 NASM)
  28. What is the compatible subset of Intel’s and AMD’s x86-64 implementations?
  29. What’s difference between number with $ or without $ symbol in at&t assembly syntax?
  30. Is processor can do memory and arithmetic operation at the same time?

Leave a Comment