src/hotspot/share/utilities/powerOfTwo.hpp

rev 58322 : 8240615: is_power_of_2() has Undefined Behaviour and is inconsistent
Reviewed-by: duke

*** 34,44 ****
  
  // Power of two convenience library.
  
  template <typename T>
  bool is_power_of_2(T x) {
!   return (x != T(0)) && ((x & (x - 1)) == T(0));
  }
  
  // Log2 of a power of 2
  inline int exact_log2(intptr_t x) {
    assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x);
--- 34,44 ----
  
  // Power of two convenience library.
  
  template <typename T>
  bool is_power_of_2(T x) {
!   return (x > T(0)) && ((x & (x - 1)) == T(0));
  }
  
  // Log2 of a power of 2
  inline int exact_log2(intptr_t x) {
    assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x);