+/***********************************************************************
+ * Vector types
+ **********************************************************************/
+#define vec_u8 vector unsigned char
+#define vec_s8 vector signed char
+#define vec_u16 vector unsigned short
+#define vec_s16 vector signed short
+#define vec_u32 vector unsigned int
+#define vec_s32 vector signed int
+#define vec_f vector float
+
+/***********************************************************************
+ * Null vector
+ **********************************************************************/
+#define LOAD_ZERO const vec_u8 zerov = vec_splat_u8( 0 )
+
+#define zero_u8v (vec_u8) zerov
+#define zero_s8v (vec_s8) zerov
+#define zero_u16v (vec_u16) zerov
+#define zero_s16v (vec_s16) zerov
+#define zero_u32v (vec_u32) zerov
+#define zero_s32v (vec_s32) zerov