diff --git a/src/versor.c b/src/versor.c
index 896e259..2874d2a 100644
--- a/src/versor.c
+++ b/src/versor.c
@@ -7,7 +7,7 @@ const BgFP32Versor BG_FP32_IDLE_VERSOR = { 1.0f, 0.0f, 0.0f, 0.0f };
 
 const BgFP64Versor BG_FP64_IDLE_VERSOR = { 1.0, 0.0, 0.0, 0.0 };
 
-void __bg_fp32_versor_normalize(const float square_module, __BgFP32VersorDarkTwin* twin)
+void __bg_fp32_versor_normalize(const float square_module, __BgFP32DarkTwinVersor* twin)
 {
     if (square_module <= BG_FP32_SQUARE_EPSYLON || (twin->x1 * twin->x1 + twin->x2 * twin->x2 + twin->x3 * twin->x3) <= BG_FP32_SQUARE_EPSYLON * square_module) {
         twin->s0 = 1.0f;
@@ -25,7 +25,7 @@ void __bg_fp32_versor_normalize(const float square_module, __BgFP32VersorDarkTwi
     twin->x3 /= module;
 }
 
-void __bg_fp64_versor_normalize(const double square_module, __BgFP64VersorDarkTwin* twin)
+void __bg_fp64_versor_normalize(const double square_module, __BgFP64DarkTwinVersor* twin)
 {
     if (square_module <= BG_FP64_SQUARE_EPSYLON || (twin->x1 * twin->x1 + twin->x2 * twin->x2 + twin->x3 * twin->x3) <= BG_FP64_SQUARE_EPSYLON * square_module) {
         twin->s0 = 1.0;
diff --git a/src/versor.h b/src/versor.h
index 312c8f9..bdc5769 100644
--- a/src/versor.h
+++ b/src/versor.h
@@ -3,6 +3,8 @@
 
 #include <stdint.h>
 
+#include <xmmintrin.h>
+
 #include "basis.h"
 #include "vector3.h"
 #include "rotation3.h"
@@ -22,11 +24,11 @@ typedef struct {
 
 typedef struct {
     float s0, x1, x2, x3;
-} __BgFP32VersorDarkTwin;
+} __BgFP32DarkTwinVersor;
 
 typedef struct {
     double s0, x1, x2, x3;
-} __BgFP64VersorDarkTwin;
+} __BgFP64DarkTwinVersor;
 
 // ================= Constants ================== //
 
@@ -37,7 +39,7 @@ extern const BgFP64Versor BG_FP64_IDLE_VERSOR;
 
 static inline void bg_fp32_versor_reset(BgFP32Versor* versor)
 {
-    __BgFP32VersorDarkTwin* twin = (__BgFP32VersorDarkTwin*)versor;
+    __BgFP32DarkTwinVersor* twin = (__BgFP32DarkTwinVersor*)versor;
 
     twin->s0 = 1.0f;
     twin->x1 = 0.0f;
@@ -47,7 +49,7 @@ static inline void bg_fp32_versor_reset(BgFP32Versor* versor)
 
 static inline void bg_fp64_versor_reset(BgFP64Versor* versor)
 {
-    __BgFP64VersorDarkTwin* twin = (__BgFP64VersorDarkTwin*)versor;
+    __BgFP64DarkTwinVersor* twin = (__BgFP64DarkTwinVersor*)versor;
 
     twin->s0 = 1.0;
     twin->x1 = 0.0;
@@ -57,13 +59,13 @@ static inline void bg_fp64_versor_reset(BgFP64Versor* versor)
 
 // ==================== Set ===================== //
 
-void __bg_fp32_versor_normalize(const float square_module, __BgFP32VersorDarkTwin* twin);
+void __bg_fp32_versor_normalize(const float square_module, __BgFP32DarkTwinVersor* twin);
 
-void __bg_fp64_versor_normalize(const double square_module, __BgFP64VersorDarkTwin* twin);
+void __bg_fp64_versor_normalize(const double square_module, __BgFP64DarkTwinVersor* twin);
 
 static inline void bg_fp32_versor_set_values(const float s0, const float x1, const float x2, const float x3, BgFP32Versor* versor)
 {
-    __BgFP32VersorDarkTwin* twin = (__BgFP32VersorDarkTwin*)versor;
+    __BgFP32DarkTwinVersor* twin = (__BgFP32DarkTwinVersor*)versor;
 
     twin->s0 = s0;
     twin->x1 = x1;
@@ -73,13 +75,13 @@ static inline void bg_fp32_versor_set_values(const float s0, const float x1, con
     const float square_module = (s0 * s0 + x1 * x1) + (x2 * x2 + x3 * x3);
 
     if (square_module < 1.0f - BG_FP32_TWO_EPSYLON || 1.0f + BG_FP32_TWO_EPSYLON < square_module) {
-        __bg_fp32_versor_normalize(square_module, (__BgFP32VersorDarkTwin*)versor);
+        __bg_fp32_versor_normalize(square_module, (__BgFP32DarkTwinVersor*)versor);
     }
 }
 
 static inline void bg_fp64_versor_set_values(const double s0, const double x1, const double x2, const double x3, BgFP64Versor* versor)
 {
-    __BgFP64VersorDarkTwin* twin = (__BgFP64VersorDarkTwin*)versor;
+    __BgFP64DarkTwinVersor* twin = (__BgFP64DarkTwinVersor*)versor;
 
     twin->s0 = s0;
     twin->x1 = x1;
@@ -97,7 +99,7 @@ static inline void bg_fp64_versor_set_values(const double s0, const double x1, c
 
 static inline void bg_fp32_versor_copy(const BgFP32Versor* from, BgFP32Versor* to)
 {
-    __BgFP32VersorDarkTwin* twin = (__BgFP32VersorDarkTwin*)to;
+    __BgFP32DarkTwinVersor* twin = (__BgFP32DarkTwinVersor*)to;
 
     twin->s0 = from->s0;
     twin->x1 = from->x1;
@@ -107,7 +109,7 @@ static inline void bg_fp32_versor_copy(const BgFP32Versor* from, BgFP32Versor* t
 
 static inline void bg_fp64_versor_copy(const BgFP64Versor* from, BgFP64Versor* to)
 {
-    __BgFP64VersorDarkTwin* twin = (__BgFP64VersorDarkTwin*)to;
+    __BgFP64DarkTwinVersor* twin = (__BgFP64DarkTwinVersor*)to;
 
     twin->s0 = from->s0;
     twin->x1 = from->x1;
@@ -185,7 +187,7 @@ static inline void bg_fp64_versor_set_from_fp32(const BgFP32Versor* versor, BgFP
 
 static inline void bg_fp32_versor_invert(BgFP32Versor* versor)
 {
-    __BgFP32VersorDarkTwin* twin = (__BgFP32VersorDarkTwin*)versor;
+    __BgFP32DarkTwinVersor* twin = (__BgFP32DarkTwinVersor*)versor;
     twin->x1 = -versor->x1;
     twin->x2 = -versor->x2;
     twin->x3 = -versor->x3;
@@ -193,7 +195,7 @@ static inline void bg_fp32_versor_invert(BgFP32Versor* versor)
 
 static inline void bg_fp64_versor_invert(BgFP64Versor* versor)
 {
-    __BgFP64VersorDarkTwin* twin = (__BgFP64VersorDarkTwin*)versor;
+    __BgFP64DarkTwinVersor* twin = (__BgFP64DarkTwinVersor*)versor;
     twin->x1 = -versor->x1;
     twin->x2 = -versor->x2;
     twin->x3 = -versor->x3;
@@ -203,7 +205,7 @@ static inline void bg_fp64_versor_invert(BgFP64Versor* versor)
 
 static inline void bg_fp32_versor_set_inverted(const BgFP32Versor* versor, BgFP32Versor* to)
 {
-    __BgFP32VersorDarkTwin* twin = (__BgFP32VersorDarkTwin*)to;
+    __BgFP32DarkTwinVersor* twin = (__BgFP32DarkTwinVersor*)to;
     twin->s0 = versor->s0;
     twin->x1 = -versor->x1;
     twin->x2 = -versor->x2;
@@ -212,7 +214,7 @@ static inline void bg_fp32_versor_set_inverted(const BgFP32Versor* versor, BgFP3
 
 static inline void bg_fp64_versor_set_inverted(const BgFP64Versor* versor, BgFP64Versor* to)
 {
-    __BgFP64VersorDarkTwin* twin = (__BgFP64VersorDarkTwin*)to;
+    __BgFP64DarkTwinVersor* twin = (__BgFP64DarkTwinVersor*)to;
     twin->s0 = versor->s0;
     twin->x1 = -versor->x1;
     twin->x2 = -versor->x2;
@@ -254,7 +256,7 @@ static inline void bg_fp32_versor_combine(const BgFP32Versor* second, const BgFP
 
     const float square_module = (s0 * s0 + x1 * x1) + (x2 * x2 + x3 * x3);
 
-    __BgFP32VersorDarkTwin* twin = (__BgFP32VersorDarkTwin*)result;
+    __BgFP32DarkTwinVersor* twin = (__BgFP32DarkTwinVersor*)result;
 
     twin->s0 = s0;
     twin->x1 = x1;
@@ -275,7 +277,7 @@ static inline void bg_fp64_versor_combine(const BgFP64Versor* second, const BgFP
 
     const double square_module = (s0 * s0 + x1 * x1) + (x2 * x2 + x3 * x3);
 
-    __BgFP64VersorDarkTwin* twin = (__BgFP64VersorDarkTwin*)result;
+    __BgFP64DarkTwinVersor* twin = (__BgFP64DarkTwinVersor*)result;
 
     twin->s0 = s0;
     twin->x1 = x1;
diff --git a/test/fp32_vector2_test.c b/test/fp32_vector2_test.c
index 5f67a94..c5bbc81 100644
--- a/test/fp32_vector2_test.c
+++ b/test/fp32_vector2_test.c
@@ -1,4 +1,4 @@
-#include "sp_vector2_test.h"
+#include "fp32_vector2_test.h"
 
 const int TEST_BG_FP32_VECTOR2_AMOUNT_1 = 5;
 
@@ -22,7 +22,7 @@ const BgFP32Vector2 TEST_BG_FP32_VECTOR2_COMMON_2[] = {
 
 const float BG_FP32_VECTOR2_SQUARE_MODULE_1[] = { 25.0f, 25.0f, 500000000.0f, 100.01f, 15266.150221f };
 
-int test_sp_vector2_square_module()
+int test_bg_fp32_vector2_square_module()
 {
     print_test_name("BgFP32Vector2 square module");
 
@@ -31,7 +31,7 @@ int test_sp_vector2_square_module()
     for (int i = 0; i < TEST_BG_FP32_VECTOR2_AMOUNT_1; i++) {
         square_module = bg_fp32_vector2_get_square_module(&TEST_BG_FP32_VECTOR2_COMMON_1[i]);
 
-        if (!test_sp_are_equal(square_module, BG_FP32_VECTOR2_SQUARE_MODULE_1[i], TEST_BG_FP32_TWO_EPSYLON)) {
+        if (!test_bg_fp32_are_equal(square_module, BG_FP32_VECTOR2_SQUARE_MODULE_1[i], TEST_BG_FP32_TWO_EPSYLON)) {
             print_test_failed();
             return TEST_RESULT_FAILED;
         }
@@ -45,16 +45,16 @@ int test_sp_vector2_square_module()
 
 const float BG_FP32_VECTOR2_MODULE_1[] = { 5.0f, 5.0f, 22360.68f, 10.0005f, 123.55626338f };
 
-int test_sp_vector2_module()
+int test_bg_fp32_vector2_module()
 {
     print_test_name("BgFP32Vector2 module");
 
     float square_module;
 
     for (int i = 0; i < TEST_BG_FP32_VECTOR2_AMOUNT_1; i++) {
-        square_module = sp_vector2_get_module(&TEST_BG_FP32_VECTOR2_COMMON_1[i]);
+        square_module = bg_fp32_vector2_get_module(&TEST_BG_FP32_VECTOR2_COMMON_1[i]);
 
-        if (!test_sp_are_equal(square_module, BG_FP32_VECTOR2_MODULE_1[i], TEST_BG_FP32_EPSYLON)) {
+        if (!test_bg_fp32_are_equal(square_module, BG_FP32_VECTOR2_MODULE_1[i], TEST_BG_FP32_EPSYLON)) {
             print_test_failed();
             return TEST_RESULT_FAILED;
         }
@@ -74,17 +74,17 @@ const BgFP32Vector2 TEST_BG_FP32_VECTOR2_COMMON_1_2_SUM[] = {
     { -122.0f, -19.6217f }
 };
 
-int test_sp_vector2_add()
+int test_bg_fp32_vector2_add()
 {
     print_test_name("BgFP32Vector2 add");
 
     BgFP32Vector2 vector;
 
     for (int i = 0; i < TEST_BG_FP32_VECTOR2_AMOUNT_1; i++) {
-        sp_vector2_add(&TEST_BG_FP32_VECTOR2_COMMON_1[i], &TEST_BG_FP32_VECTOR2_COMMON_2[i], &vector);
+        bg_fp32_vector2_add(&TEST_BG_FP32_VECTOR2_COMMON_1[i], &TEST_BG_FP32_VECTOR2_COMMON_2[i], &vector);
 
-        if (!test_sp_are_equal(vector.x1, TEST_BG_FP32_VECTOR2_COMMON_1_2_SUM[i].x1, TEST_BG_FP32_EPSYLON) ||
-            !test_sp_are_equal(vector.x2, TEST_BG_FP32_VECTOR2_COMMON_1_2_SUM[i].x2, TEST_BG_FP32_EPSYLON)) {
+        if (!test_bg_fp32_are_equal(vector.x1, TEST_BG_FP32_VECTOR2_COMMON_1_2_SUM[i].x1, TEST_BG_FP32_EPSYLON) ||
+            !test_bg_fp32_are_equal(vector.x2, TEST_BG_FP32_VECTOR2_COMMON_1_2_SUM[i].x2, TEST_BG_FP32_EPSYLON)) {
             print_test_failed();
             return TEST_RESULT_FAILED;
         }
@@ -104,17 +104,17 @@ const BgFP32Vector2 TEST_BG_FP32_VECTOR2_COMMON_1_2_DIFF[] = {
     { -125.0f, 27.0783f }
 };
 
-int test_sp_vector2_subtract()
+int test_bg_fp32_vector2_subtract()
 {
     print_test_name("BgFP32Vector2 subtract");
 
     BgFP32Vector2 vector;
 
     for (int i = 0; i < TEST_BG_FP32_VECTOR2_AMOUNT_1; i++) {
-        sp_vector2_subtract(&TEST_BG_FP32_VECTOR2_COMMON_1[i], &TEST_BG_FP32_VECTOR2_COMMON_2[i], &vector);
+        bg_fp32_vector2_subtract(&TEST_BG_FP32_VECTOR2_COMMON_1[i], &TEST_BG_FP32_VECTOR2_COMMON_2[i], &vector);
 
-        if (!test_sp_are_equal(vector.x1, TEST_BG_FP32_VECTOR2_COMMON_1_2_DIFF[i].x1, TEST_BG_FP32_EPSYLON) ||
-            !test_sp_are_equal(vector.x2, TEST_BG_FP32_VECTOR2_COMMON_1_2_DIFF[i].x2, TEST_BG_FP32_EPSYLON)) {
+        if (!test_bg_fp32_are_equal(vector.x1, TEST_BG_FP32_VECTOR2_COMMON_1_2_DIFF[i].x1, TEST_BG_FP32_EPSYLON) ||
+            !test_bg_fp32_are_equal(vector.x2, TEST_BG_FP32_VECTOR2_COMMON_1_2_DIFF[i].x2, TEST_BG_FP32_EPSYLON)) {
             print_test_failed();
             return TEST_RESULT_FAILED;
         }
@@ -126,23 +126,23 @@ int test_sp_vector2_subtract()
 
 // ==================== 1234 ==================== //
 
-int test_sp_vector2()
+int test_bg_fp32_vector2()
 {
     print_test_section("BgFP32Vector2");
 
-    if (test_sp_vector2_square_module() != TEST_RESULT_SUCCES) {
+    if (test_bg_fp32_vector2_square_module() != TEST_RESULT_SUCCES) {
         return TEST_RESULT_FAILED;
     }
 
-    if (test_sp_vector2_module() != TEST_RESULT_SUCCES) {
+    if (test_bg_fp32_vector2_module() != TEST_RESULT_SUCCES) {
         return TEST_RESULT_FAILED;
     }
 
-    if (test_sp_vector2_add() != TEST_RESULT_SUCCES) {
+    if (test_bg_fp32_vector2_add() != TEST_RESULT_SUCCES) {
         return TEST_RESULT_FAILED;
     }
 
-    if (test_sp_vector2_subtract() != TEST_RESULT_SUCCES) {
+    if (test_bg_fp32_vector2_subtract() != TEST_RESULT_SUCCES) {
         return TEST_RESULT_FAILED;
     }
 
diff --git a/test/geometry-test.vcxproj b/test/geometry-test.vcxproj
index 466a968..0ca598a 100644
--- a/test/geometry-test.vcxproj
+++ b/test/geometry-test.vcxproj
@@ -148,13 +148,13 @@
     </ProjectReference>
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="fp32_vector2_test.c" />
     <ClCompile Include="geometry_test.c" />
     <ClCompile Include="main.c" />
-    <ClCompile Include="sp_vector2_test.c" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="fp32_vector2_test.h" />
     <ClInclude Include="geometry_test.h" />
-    <ClInclude Include="sp_vector2_test.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
diff --git a/test/geometry-test.vcxproj.filters b/test/geometry-test.vcxproj.filters
index d7e4b49..df06490 100644
--- a/test/geometry-test.vcxproj.filters
+++ b/test/geometry-test.vcxproj.filters
@@ -21,7 +21,7 @@
     <ClCompile Include="geometry_test.c">
       <Filter>Исходные файлы</Filter>
     </ClCompile>
-    <ClCompile Include="sp_vector2_test.c">
+    <ClCompile Include="fp32_vector2_test.c">
       <Filter>Исходные файлы</Filter>
     </ClCompile>
   </ItemGroup>
@@ -29,7 +29,7 @@
     <ClInclude Include="geometry_test.h">
       <Filter>Исходные файлы</Filter>
     </ClInclude>
-    <ClInclude Include="sp_vector2_test.h">
+    <ClInclude Include="fp32_vector2_test.h">
       <Filter>Исходные файлы</Filter>
     </ClInclude>
   </ItemGroup>