Why flush the pipeline for Memory Order Violation caused by other logical processors?

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More Related Contents:

  1. Micro fusion and addressing modes
  2. Why doesn’t GCC use partial registers?
  3. How exactly do partial registers on Haswell/Skylake perform? Writing AL seems to have a false dependency on RAX, and AH is inconsistent
  4. Why isn’t movl from memory to memory allowed?
  5. What is the stack engine in the Sandybridge microarchitecture?
  6. What is the “FS”/”GS” register intended for?
  7. What is a Partial Flag Stall?
  8. Does lock xchg have the same behavior as mfence?
  9. Slow jmp-instruction
  10. Does the Intel Memory Model make SFENCE and LFENCE redundant?
  11. Why is (or isn’t?) SFENCE + LFENCE equivalent to MFENCE?
  12. Does a memory barrier ensure that the cache coherence has been completed?
  13. Does an x86 CPU reorder instructions?
  14. Does it make any sense to use the LFENCE instruction on x86/x86_64 processors?
  15. What’s the purpose of the rotate instructions (ROL, RCL on x86)?
  16. Why does Intel hide internal RISC core in their processors?
  17. Why isn’t the instruction pointer a normal register usable with MOV or ADD?
  18. Which is a better write barrier on x86: lock+addl or xchgl?
  19. What is instruction fusion in contemporary x86 processors?
  20. x86 32 bit opcodes that differ in x86-x64 or entirely removed
  21. Is a mov to a segmentation register slower than a mov to a general purpose register?
  22. How does the CPU know how many bytes it should read for the next instruction, considering instructions have different lengths?
  23. Is processor can do memory and arithmetic operation at the same time?
  24. x86 instructions, define value
  25. Why is the loop instruction slow? Couldn’t Intel have implemented it efficiently?
  26. Are loads and stores the only instructions that gets reordered?
  27. What setup does REP do?
  28. If I don’t use fences, how long could it take a core to see another core’s writes?
  29. x86 Calculating AX given AH and AL?
  30. Addressing Modes in Assembly Language (IA-32 NASM)

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