Add routines to standard library to do efficient AOS/SOA conversions.

Currently, we just support 3 and 4-wide variants (i.e. xyzxyz.. and xyzwxyzw..),
for int32 and float types.

stdlib.ispc

@@ -315,6 +315,57 @@ static inline uniform int lanemask() {
     return __movmsk(__mask);
 }
 
+///////////////////////////////////////////////////////////////////////////
+// AOS/SOA conversion
+
+static inline void
+aos_to_soa3(uniform float a[], uniform int offset, reference float v0,
+            reference float v1, reference float v2) {
+    __aos_to_soa3_float(a, offset, v0, v1, v2);
+}
+
+static inline void
+soa_to_aos3(float v0, float v1, float v2, uniform float a[], 
+            uniform int offset) {
+    __soa_to_aos3_float(v0, v1, v2, a, offset);
+}
+
+static inline void
+aos_to_soa4(uniform float a[], uniform int offset, reference float v0,
+            reference float v1, reference float v2, reference float v3) {
+    __aos_to_soa4_float(a, offset, v0, v1, v2, v3);
+}
+
+static inline void
+soa_to_aos4(float v0, float v1, float v2, float v3, uniform float a[], 
+            uniform int offset) {
+    __soa_to_aos4_float(v0, v1, v2, v3, a, offset);
+}
+
+static inline void
+aos_to_soa3(uniform int32 a[], uniform int offset, reference int32 v0,
+            reference int32 v1, reference int32 v2) {
+    __aos_to_soa3_int32(a, offset, v0, v1, v2);
+}
+
+static inline void
+soa_to_aos3(int32 v0, int32 v1, int32 v2, uniform int32 a[], 
+            uniform int offset) {
+    __soa_to_aos3_int32(v0, v1, v2, a, offset);
+}
+
+static inline void
+aos_to_soa4(uniform int32 a[], uniform int offset, reference int32 v0,
+            reference int32 v1, reference int32 v2, reference int32 v3) {
+    __aos_to_soa4_int32(a, offset, v0, v1, v2, v3);
+}
+
+static inline void
+soa_to_aos4(int32 v0, int32 v1, int32 v2, int32 v3, uniform int32 a[], 
+            uniform int offset) {
+    __soa_to_aos4_int32(v0, v1, v2, v3, a, offset);
+}
+
 ///////////////////////////////////////////////////////////////////////////
 // Prefetching