From ac9d61d45fec988640b57dc6b9de97e7d46c41f5 Mon Sep 17 00:00:00 2001
From: Derek Schuff <dschuff@chromium.org>
Date: Wed, 9 Mar 2016 17:02:00 -0800
Subject: Move rol/ror to src/support/bits.h

---
 src/support/bits.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'src/support/bits.h')

diff --git a/src/support/bits.h b/src/support/bits.h
index bbafb29d4..6c9fbad94 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 +66,20 @@ 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));
+}
+
+
 }  // namespace wasm
 
 #endif  // wasm_support_bits_h
-- 
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