support of operators

tests/operators1.ispc

@@ -0,0 +1,64 @@
+
+export uniform int width() { return programCount; }
+
+struct S {
+    float a;
+};
+
+// References "struct&" were put in random order to test them.
+struct S operator*(struct S& rr, struct S rv) {
+    struct S c;
+    c.a = rr.a + rv.a + 2;
+    return c;
+}
+
+struct S operator/(struct S& rr, struct S& rv) {
+    struct S c;
+    c.a = rr.a - rr.a + 2;
+    return c;
+}
+
+struct S operator%(struct S rr, struct S& rv) {
+    struct S c;
+    c.a = rr.a + rv.a + 2;
+    return c;
+}
+
+struct S operator+(struct S rr, struct S rv) {
+    struct S c;
+    c.a = rr.a / rv.a + 3;
+    return c;
+}
+
+struct S operator-(struct S rr, struct S& rv) {
+    struct S c;
+    c.a = rr.a + rv.a + 2;
+    return c;
+}
+
+struct S operator>>(struct S& rr, struct S rv) {
+    struct S c;
+    c.a = rr.a / rv.a + 3;
+    return c;
+}
+
+struct S operator<<(struct S& rr, struct S& rv) {
+    struct S c;
+    c.a = rr.a + rv.a + 2;
+    return c;
+}
+
+struct S a;
+struct S b;
+struct S d;
+
+export void f_f(uniform float RET[], uniform float aFOO[]) {
+    a.a = 5;
+    b.a = -5;
+    d = a * b + b / a - a << (b - b) - a;
+    RET[programIndex] = d.a;
+}
+
+export void result(uniform float RET[4]) {
+    RET[programIndex] = 12;
+}