diff --git a/glm/gtx/bit.hpp b/glm/gtx/bit.hpp
index d6e0a633..850b032b 100644
--- a/glm/gtx/bit.hpp
+++ b/glm/gtx/bit.hpp
@@ -38,8 +38,11 @@ namespace glm
 		//! Component wise extraction of bit fields.
 		//! genType and genIType could be a scalar or a vector.
 		//! From GLM_GTX_bit extension.
-		template <typename genType, typename genIType>
-		genIType extractField(genType const & v, genIType const & first, genIType const & count);
+		template <typename genIUType, typename sizeType>
+		genIUType extractField(
+			genIUType const & v, 
+			sizeType const & first, 
+			sizeType const & count);
 
 		//! Find the lowest bit set to 1 in a integer variable.
 		//! From GLM_GTX_bit extension.
diff --git a/glm/gtx/bit.inl b/glm/gtx/bit.inl
index f9eb8fb1..5d8a2faa 100644
--- a/glm/gtx/bit.inl
+++ b/glm/gtx/bit.inl
@@ -92,141 +92,147 @@ inline genIType extractField
 )
 {
 	assert(first + count < sizeof(double));
-	return (detail::uif64(value).i << first) >> ((sizeof(double) << 3) - count);
+	return (detail::uif64(value).i << first) >> ((sizeof(double) << genIType(3)) - count);
 }
 
-template <typename genType, typename genIType>
-inline genIType extractField
+template <typename genIUType, typename sizeType>
+inline genIUType extractField
 (
-	genType const & value, 
-	genIType const & first, 
-	genIType const & count
+	genIUType const & Value, 
+	sizeType const & First, 
+	sizeType const & Count
 )
 {
-	assert(first + count < sizeof(genType));
-	return (value << first) >> ((sizeof(genType) << 3) - count);
+	sizeType GenSize = sizeof(genIUType) << 3;
+
+	assert(First + Count <= GenSize);
+
+	genIUType ShiftLeft = Count ? Value << (GenSize - (Count + First)) : 0;
+	genIUType ShiftBack = ShiftLeft >> genIUType(GenSize - Count);
+
+	return ShiftBack;
 }
 
-template <typename valType, typename valIType>
-inline detail::tvec2<valIType> extractField
+template <typename genIUType, typename sizeType>
+inline detail::tvec2<genIUType> extractField
 (
-	detail::tvec2<valType> const & value, 
-	valIType const & first, 
-	valIType const & count
+	detail::tvec2<genIUType> const & value, 
+	sizeType const & first, 
+	sizeType const & count
 )
 {
-	return detail::tvec2<valIType>(
+	return detail::tvec2<genIUType>(
 		extractField(value[0], first, count),
 		extractField(value[1], first, count));
 }
 
-template <typename valType, typename valIType>
-inline detail::tvec3<valIType> extractField
+template <typename genIUType, typename sizeType>
+inline detail::tvec3<genIUType> extractField
 (
-	detail::tvec3<valType> const & value, 
-	valIType const & first, 
-	valIType const & count
+	detail::tvec3<genIUType> const & value, 
+	sizeType const & first, 
+	sizeType const & count
 )
 {
-	return detail::tvec3<valIType>(
+	return detail::tvec3<genIUType>(
 		extractField(value[0], first, count),
 		extractField(value[1], first, count),
 		extractField(value[2], first, count));
 }
 
-template <typename valType, typename valIType>
-inline detail::tvec4<valIType> extractField
+template <typename genIUType, typename sizeType>
+inline detail::tvec4<genIUType> extractField
 (
-	detail::tvec4<valType> const & value, 
-	valIType const & first, 
-	valIType const & count
+	detail::tvec4<genIUType> const & value, 
+	sizeType const & first, 
+	sizeType const & count
 )
 {
-	return detail::tvec4<valIType>(
+	return detail::tvec4<genIUType>(
 		extractField(value[0], first, count),
 		extractField(value[1], first, count),
 		extractField(value[2], first, count),
 		extractField(value[3], first, count));
 }
 
-template <typename valType, typename valIType>
-inline detail::tvec2<valIType> extractField
+template <typename genIUType, typename sizeType>
+inline detail::tvec2<genIUType> extractField
 (
-	detail::tvec2<valType> const & value, 
-	detail::tvec2<valIType> const & first, 
-	detail::tvec2<valIType> const & count
+	detail::tvec2<genIUType> const & value, 
+	detail::tvec2<sizeType> const & first, 
+	detail::tvec2<sizeType> const & count
 )
 {
-	return detail::tvec2<valIType>(
+	return detail::tvec2<genIUType>(
 		extractField(value[0], first[0], count[0]),
 		extractField(value[1], first[1], count[1]));
 }
 
-template <typename valType, typename valIType>
-inline detail::tvec3<valIType> extractField
+template <typename genIUType, typename sizeType>
+inline detail::tvec3<genIUType> extractField
 (
-	detail::tvec3<valType> const & value, 
-	detail::tvec3<valIType> const & first, 
-	detail::tvec3<valIType> const & count
+	detail::tvec3<genIUType> const & value, 
+	detail::tvec3<sizeType> const & first, 
+	detail::tvec3<sizeType> const & count
 )
 {
-	return detail::tvec3<valIType>(
+	return detail::tvec3<genIUType>(
 		extractField(value[0], first[0], count[0]),
 		extractField(value[1], first[1], count[1]),
 		extractField(value[2], first[2], count[2]));
 }
 
-template <typename valType, typename valIType>
-inline detail::tvec4<valIType> extractField
+template <typename genIUType, typename sizeType>
+inline detail::tvec4<genIUType> extractField
 (
-	detail::tvec4<valType> const & value, 
-	detail::tvec4<valIType> const & first, 
-	detail::tvec4<valIType> const & count
+	detail::tvec4<genIUType> const & value, 
+	detail::tvec4<sizeType> const & first, 
+	detail::tvec4<sizeType> const & count
 )
 {
-	return detail::tvec4<valIType>(
+	return detail::tvec4<genIUType>(
 		extractField(value[0], first[0], count[0]),
 		extractField(value[1], first[1], count[1]),
 		extractField(value[2], first[2], count[2]),
 		extractField(value[3], first[3], count[3]));
 }
 
-template <typename valType, typename valIType>
-inline detail::tvec2<valIType> extractField
+template <typename genIUType, typename sizeType>
+inline detail::tvec2<genIUType> extractField
 (
-	valType const & value, 
-	detail::tvec2<valIType> const & first, 
-	detail::tvec2<valIType> const & count
+	genIUType const & value, 
+	detail::tvec2<sizeType> const & first, 
+	detail::tvec2<sizeType> const & count
 )
 {
-	return detail::tvec2<valIType>(
+	return detail::tvec2<genIUType>(
 		extractField(value, first[0], count[0]),
 		extractField(value, first[1], count[1]));
 }
 
-template <typename valType, typename valIType>
-inline detail::tvec3<valIType> extractField
+template <typename genIUType, typename sizeType>
+inline detail::tvec3<genIUType> extractField
 (
-	valType const & value, 
-	detail::tvec3<valIType> const & first, 
-	detail::tvec3<valIType> const & count
+	genIUType const & value, 
+	detail::tvec3<sizeType> const & first, 
+	detail::tvec3<sizeType> const & count
 )
 {
-	return detail::tvec3<valIType>(
+	return detail::tvec3<genIUType>(
 		extractField(value, first[0], count[0]),
 		extractField(value, first[1], count[1]),
 		extractField(value, first[2], count[2]));
 }
 
-template <typename valType, typename valIType>
-inline detail::tvec4<valIType> extractField
+template <typename genIUType, typename sizeType>
+inline detail::tvec4<genIUType> extractField
 (
-	valType const & value, 
-	detail::tvec4<valIType> const & first, 
-	detail::tvec4<valIType> const & count
+	genIUType const & value, 
+	detail::tvec4<sizeType> const & first, 
+	detail::tvec4<sizeType> const & count
 )
 {
-	return detail::tvec4<valIType>(
+	return detail::tvec4<genIUType>(
 		extractField(value, first[0], count[0]),
 		extractField(value, first[1], count[1]),
 		extractField(value, first[2], count[2]),