What is the point of SSE2 instructions such as orpd?

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  1. Why isn’t movl from memory to memory allowed?
  2. What is the difference between MOV and LEA?
  3. What are the best instruction sequences to generate vector constants on the fly?
  4. Is it possible to use SSE and SSE2 to make a 128-bit wide integer?
  5. What is an assembly-level representation of pushl/popl %esp?
  6. What’s the purpose of the rotate instructions (ROL, RCL on x86)?
  7. Using ymm registers as a “memory-like” storage location
  8. Difference between MOVDQA and MOVAPS x86 instructions?
  9. Where is VPERMB in AVX2?
  10. Can PTEST be used to test if two registers are both zero or some other condition?
  11. Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
  12. When and why do we sign extend and use cdq with mul/div?
  13. What is the purpose of XORing a register with itself? [duplicate]
  14. What registers must be preserved by an x86 function?
  15. What is the meaning of MOV (%r11,%r12,1), %edx?
  16. x86, difference between BYTE and BYTE PTR
  17. Why is GCC pushing an extra return address on the stack?
  18. x86 XOR opcode differences
  19. What is the 0x10 in the “leal 0x10(%ebx), %eax” x86 assembly instruction?
  20. Sum reduction of unsigned bytes without overflow, using SSE2 on Intel
  21. Questions about AT&T x86 Syntax design
  22. NASM Error Parsing, Instruction Expected
  23. X86 prefetching optimizations: “computed goto” threaded code
  24. What are the ESP and the EBP registers?
  25. What is the penalty of mixing EVEX and VEX encoded scheme?
  26. Second stage of bootloader prints garbage using Int 0x10/ah=0x0e
  27. error A2070: invalid instruction operands
  28. How to know if an assembly code has particular syntax (emu8086, NASM, TASM, …)?
  29. Why is the Carry Flag set during a subtraction when zero is the minuend?
  30. how does push and pop work in assembly

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