1 files changed, 17 insertions, 0 deletions
diff --git a/src/support/bits.h b/src/support/bits.h
index bbafb29d4..5d3502b81 100644
--- a/src/support/bits.h
+++ b/src/support/bits.h
@@ -17,6 +17,7 @@
 #ifndef wasm_support_bits_h
 #define wasm_support_bits_h
 
+#include <climits>
 #include <cstdint>
 #include <type_traits>
 
@@ -65,6 +66,22 @@ int CountLeadingZeroes(T v) {
   return CountLeadingZeroes(typename std::make_unsigned<T>::type(v));
 }
 
+template <typename T>
+inline static T RotateLeft(T val, T count) {
+  T mask = sizeof(T) * CHAR_BIT - 1;
+  count &= mask;
+  return (val << count) | (val >> (-count & mask));
+}
+template <typename T>
+inline static T RotateRight(T val, T count) {
+  T mask = sizeof(T) * CHAR_BIT - 1;
+  count &= mask;
+  return (val >> count) | (val << (-count & mask));
+}
+
+extern uint32_t Log2(uint32_t v);
+extern uint32_t Pow2(uint32_t v);
+
 }  // namespace wasm
 
 #endif  // wasm_support_bits_h