What does `rep ret` mean?

by

More Related Contents:

  1. How exactly do partial registers on Haswell/Skylake perform? Writing AL seems to have a false dependency on RAX, and AH is inconsistent
  2. Test whether a register is zero with CMP reg,0 vs OR reg,reg?
  3. Slow jmp-instruction
  4. Does cmpxchg write destination cache line on failure? If not, is it better than xchg for spinlock?
  5. Is vxorps-zeroing on AMD Jaguar/Bulldozer/Zen faster with xmm registers than ymm?
  6. “enter” vs “push ebp; mov ebp, esp; sub esp, imm” and “leave” vs “mov esp, ebp; pop ebp”
  7. Weird performance effects from nearby dependent stores in a pointer-chasing loop on IvyBridge. Adding an extra load speeds it up?
  8. How to force NASM to encode [1 + rax*2] as disp32 + index*2 instead of disp8 + base + index?
  9. Does using xor reg, reg give advantage over mov reg, 0? [duplicate]
  10. Does Skylake need vzeroupper for turbo clocks to recover after a 512-bit instruction that only reads a ZMM register, writing a k mask?
  11. Why isn’t movl from memory to memory allowed?
  12. Why does breaking the “output dependency” of LZCNT matter?
  13. `testl` eax against eax?
  14. What if there is no return statement in a CALLed block of code in assembly programs
  15. What is the “FS”/”GS” register intended for?
  16. Branch alignment for loops involving micro-coded instructions on Intel SnB-family CPUs
  17. What methods can be used to efficiently extend instruction length on modern x86?
  18. Why is there not a register that contains the higher bytes of EAX?
  19. What is the function of the push / pop instructions used on registers in x86 assembly?
  20. Assembly (x86): db ‘string’,0 does not get executed unless there’s a jump instruction
  21. Why NASM on Linux changes registers in x86_64 assembly
  22. about assembly CF(Carry) and OF(Overflow) flag
  23. Assembly Language – How to do Modulo?
  24. Does it matter where the ret instruction is called in a procedure in x86 assembly
  25. What’s the purpose of the rotate instructions (ROL, RCL on x86)?
  26. Why isn’t the instruction pointer a normal register usable with MOV or ADD?
  27. How to tell the length of an x86 instruction?
  28. Optimize for fast multiplication but slow addition: FMA and doubledouble
  29. In what situation would the AVX2 gather instructions be faster than individually loading the data?
  30. x86 32 bit opcodes that differ in x86-x64 or entirely removed

Leave a Comment