avoid hexfloats which not support in C++14

MaxGraey · Aug 3, 2020 · 4938680 · 4938680
1 parent 8b04e1e
commit 4938680
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/src/support/bits.h b/src/support/bits.h
@@ -72,13 +72,14 @@ template<typename T> bool IsPowerOf2(T v) {
 template<typename T> bool IsPowerOf2Float(T v) {
   static_assert(std::is_floating_point<T>::value, "unexpected type");
 
-  const double MIN_POT = 0x1.0p-1022; // 0x001 << 52
-  const double MAX_POT = 0x1.0p+1022; // 0x7FD << 52
+  const double MIN_POT = 0x001ULL << 52; // 0x1.0p-1022
+  const double MAX_POT = 0x7FDULL << 52; // 0x1.0p+1022
   // TODO: use different implementations for 32-bit and 64-bit floats
   double x = v; // promote 32-bit floats to 64-bit floats
   uint64_t y = reinterpret_cast<uint64_t&>(x) & (0x7FFULL << 52);
   double z = reinterpret_cast<double&>(y);
-  if (z < MIN_POT || z > MAX_POT) {
+  if (z < reinterpret_cast<const double&>(MIN_POT) ||
+      z > reinterpret_cast<const double&>(MAX_POT)) {
     return false;
   }
   return x == z;