What is the stack engine in the Sandybridge microarchitecture?

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  1. Micro fusion and addressing modes
  2. How exactly do partial registers on Haswell/Skylake perform? Writing AL seems to have a false dependency on RAX, and AH is inconsistent
  3. What is a Partial Flag Stall?
  4. Slow jmp-instruction
  5. Why does Intel hide internal RISC core in their processors?
  6. Why is the loop instruction slow? Couldn’t Intel have implemented it efficiently?
  7. Why doesn’t GCC use partial registers?
  8. Why isn’t movl from memory to memory allowed?
  9. How to read the Intel Opcode notation
  10. What is the “FS”/”GS” register intended for?
  11. 32-byte aligned routine does not fit the uops cache
  12. Size of store buffers on Intel hardware? What exactly is a store buffer?
  13. What was the original reason for the design of AT&T assembly syntax?
  14. What’s the purpose of the rotate instructions (ROL, RCL on x86)?
  15. Is there a complete x86 assembly language reference that uses AT&T syntax? [closed]
  16. Why flush the pipeline for Memory Order Violation caused by other logical processors?
  17. Why isn’t the instruction pointer a normal register usable with MOV or ADD?
  18. What is instruction fusion in contemporary x86 processors?
  19. x86 32 bit opcodes that differ in x86-x64 or entirely removed
  20. Where is VPERMB in AVX2?
  21. Is a mov to a segmentation register slower than a mov to a general purpose register?
  22. Does Skylake need vzeroupper for turbo clocks to recover after a 512-bit instruction that only reads a ZMM register, writing a k mask?
  23. How does the CPU know how many bytes it should read for the next instruction, considering instructions have different lengths?
  24. Is processor can do memory and arithmetic operation at the same time?
  25. How to disassemble 16-bit x86 boot sector code in GDB with “x/i $pc”? It gets treated as 32-bit
  26. What does the /4 mean in FF /4?
  27. Is this code correct (Number plus number, then print the result)
  28. Near call/jump tables don’t always work in a bootloader
  29. How to read and write x86 flags registers directly?
  30. Are two store buffer entries needed for split line/page stores on recent Intel?

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