Avoid bitcast from/to function types returning simd to respect the ca… (#3581)

* Avoid bitcast from/to function types returning simd to respect the calling conventions difference

* minor: remove public declaration of KVector4i32

runtime/src/main/cpp/Types.cpp

@@ -97,8 +97,15 @@ KVector4f Kotlin_Vector4f_of(KFloat f0, KFloat f1, KFloat f2, KFloat f3) {
 	return {f0, f1, f2, f3};
 }
 
-KVector4i32 Kotlin_Vector4i32_of(KInt f0, KInt f1, KInt f2, KInt f3) {
-	return {f0, f1, f2, f3};
+/*
+ * In the current design all simd types are mapped internally to floating type, e.g. <4 x float>.
+ * However, some platforms (ex. arm32) have different calling convention for <4 x float> and <4 x i32>.
+ * To avoid illegal bitcast from/to function types the following function
+ * return type MUST be <4 x float> and explicit type cast is done on the variable type.
+ */
+KVector4f Kotlin_Vector4i32_of(KInt f0, KInt f1, KInt f2, KInt f3) {
+	KInt __attribute__ ((__vector_size__(16))) v4i = {f0, f1, f2, f3};
+	return (KVector4f)v4i;
 }
 
 }  // extern "C"

runtime/src/main/cpp/Types.h

@@ -52,7 +52,6 @@ typedef float   KFloat;
 typedef double  KDouble;
 typedef void*   KNativePtr;
 typedef KFloat __attribute__ ((__vector_size__ (16)))   KVector4f;
-typedef KInt   __attribute__ ((__vector_size__ (16)))   KVector4i32;
 
 typedef const void* KConstNativePtr;