Is `reinterpret_cast`ing between hardware SIMD vector pointer and the corresponding type an undefined behavior?

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  1. Accessing inactive union member and undefined behavior?
  2. When does invoking a member function on a null instance result in undefined behavior?
  3. Has C++ standard changed with respect to the use of indeterminate values and undefined behavior in C++14?
  4. Optimizing away a “while(1);” in C++0x
  5. Does initialization entail lvalue-to-rvalue conversion? Is `int x = x;` UB?
  6. Do I need to cast to unsigned char before calling toupper(), tolower(), et al.?
  7. Why does left shift operation invoke Undefined Behaviour when the left side operand has negative value?
  8. Why does integer overflow on x86 with GCC cause an infinite loop?
  9. Does “Undefined Behavior” really permit *anything* to happen? [duplicate]
  10. Where exactly does C++ standard say dereferencing an uninitialized pointer is undefined behavior?
  11. Difference between Undefined Behavior and Ill-formed, no diagnostic message required
  12. When should I use _mm_sfence _mm_lfence and _mm_mfence
  13. Is passing a C++ object into its own constructor legal?
  14. Are multiple mutations of the same variable within initializer lists undefined behavior pre C++11
  15. Does not evaluating the expression to which sizeof is applied make it legal to dereference a null or invalid pointer inside sizeof in C++?
  16. inlining failed in call to always_inline ‘__m256d _mm256_broadcast_sd(const double*)’
  17. In C++11, does `i += ++i + 1` exhibit undefined behavior?
  18. So why is i = ++i + 1 well-defined in C++11?
  19. Why is f(i = -1, i = -1) undefined behavior?
  20. Implementing a std::vector like container without undefined behavior
  21. Are pointer variables just integers with some operators or are they “symbolic”?
  22. The behaviour of floating point division by zero
  23. Can branches with undefined behavior be assumed unreachable and optimized as dead code?
  24. Dangling references and undefined behavior
  25. In which versions of the C++ standard does “(i+=10)+=10” have undefined behaviour?
  26. Observable behavior and undefined behavior — What happens if I don’t call a destructor?
  27. Undefined, unspecified and implementation-defined behavior
  28. Is the compiler allowed to optimize out heap memory allocations?
  29. Is there a (semantic) difference between the return value of placement new and the casted value of its operand?
  30. When is it valid to access a pointer to a “dead” object?

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