diff --git a/Utilities/types.h b/Utilities/types.h
index caafe33158..6f57081444 100644
--- a/Utilities/types.h
+++ b/Utilities/types.h
@@ -974,45 +974,85 @@ inline void busy_wait(std::size_t count = 100)
 // Rotate helpers
 #if defined(__GNUG__)
 
-inline u8 rol8(const u8 x, const u8 n)
+inline u8 rol8(u8 x, u8 n)
 {
 	u8 result = x;
 	__asm__("rolb %[n], %[result]" : [result] "+g" (result) : [n] "c" (n));
 	return result;
 }
 
-inline u16 rol16(const u16 x, const u16 n)
+inline u8 ror8(u8 x, u8 n)
+{
+	u8 result = x;
+	__asm__("rorb %[n], %[result]" : [result] "+g" (result) : [n] "c" (n));
+	return result;
+}
+
+inline u16 rol16(u16 x, u16 n)
 {
 	u16 result = x;
 	__asm__("rolw %b[n], %[result]" : [result] "+g" (result) : [n] "c" (n));
 	return result;
 }
 
-inline u32 rol32(const u32 x, const u32 n)
+inline u16 ror16(u16 x, u16 n)
+{
+	u16 result = x;
+	__asm__("rorw %b[n], %[result]" : [result] "+g" (result) : [n] "c" (n));
+	return result;
+}
+
+inline u32 rol32(u32 x, u32 n)
 {
 	u32 result = x;
 	__asm__("roll %b[n], %[result]" : [result] "+g" (result) : [n] "c" (n));
 	return result;
 }
 
-inline u64 rol64(const u64 x, const u64 n)
+inline u32 ror32(u32 x, u32 n)
+{
+	u32 result = x;
+	__asm__("rorl %b[n], %[result]" : [result] "+g" (result) : [n] "c" (n));
+	return result;
+}
+
+inline u64 rol64(u64 x, u64 n)
 {
 	u64 result = x;
 	__asm__("rolq %b[n], %[result]" : [result] "+g" (result) : [n] "c" (n));
 	return result;
 }
 
-inline u64 ror64(const u64 x, const u64 n)
+inline u64 ror64(u64 x, u64 n)
 {
 	u64 result = x;
 	__asm__("rorq %b[n], %[result]" : [result] "+g" (result) : [n] "c" (n));
 	return result;
 }
 
+inline u64 umulh64(u64 a, u64 b)
+{
+	u64 result;
+	__asm__("mulq %[b]" : "=d" (result) : [a] "a" (a), [b] "rm" (b));
+	return result;
+}
+
+inline s64 mulh64(s64 a, s64 b)
+{
+	s64 result;
+	__asm__("imulq %[b]" : "=d" (result) : [a] "a" (a), [b] "rm" (b));
+	return result;
+}
+
 #elif defined(_MSC_VER)
-inline u8 rol8(const u8 x, const u8 n) { return _rotl8(x, n); }
-inline u16 rol16(const u16 x, const u16 n) { return _rotl16(x, (u8)n); }
-inline u32 rol32(const u32 x, const u32 n) { return _rotl(x, (int)n); }
-inline u64 rol64(const u64 x, const u64 n) { return _rotl64(x, (int)n); }
-inline u64 ror64(const u64 x, const u64 n) { return _rotr64(x, (int)n); }
+inline u8 rol8(u8 x, u8 n) { return _rotl8(x, n); }
+inline u8 ror8(u8 x, u8 n) { return _rotr8(x, n); }
+inline u16 rol16(u16 x, u16 n) { return _rotl16(x, (u8)n); }
+inline u16 ror16(u16 x, u16 n) { return _rotr16(x, (u8)n); }
+inline u32 rol32(u32 x, u32 n) { return _rotl(x, (int)n); }
+inline u32 ror32(u32 x, u32 n) { return _rotr(x, (int)n); }
+inline u64 rol64(u64 x, u64 n) { return _rotl64(x, (int)n); }
+inline u64 ror64(u64 x, u64 n) { return _rotr64(x, (int)n); }
+inline u64 umulh64(u64 x, u64 y) { return __umulh(x, y); }
+inline s64 mulh64(s64 x, s64 y) { return __mulh(x, y); }
 #endif