added tests as prepared by oliver

test/ref/return.c

@@ -0,0 +1,96 @@
+/*
+  !!DESCRIPTION!! return values, implicit type conversion on return
+  !!ORIGIN!!      cc65 devel list
+  !!LICENCE!!     Public Domain
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+unsigned char val_char=0x76;
+unsigned int val_int=0x5678;
+unsigned long val_long=0x12345678;
+
+int test1_int_char(void)
+{
+    return val_char;
+}
+int test1_int_int(void)
+{
+    return val_int;
+}
+
+int test2_int_char(void)
+{
+    return (int)val_char;
+}
+int test2_int_int(void)
+{
+    return (int)val_int;
+}
+
+long test1_long_char(void)
+{
+    return val_char;
+}
+long test1_long_int(void)
+{
+    return val_int;
+}
+long test1_long_long(void)
+{
+    return val_long;
+}
+
+long test2_long_char(void)
+{
+    return (long)val_char;
+}
+long test2_long_int(void)
+{
+    return (long)val_int;
+}
+long test2_long_long(void)
+{
+    return (long)val_long;
+}
+
+#define dotest(_n,_a,_v) \
+    _n=_a; \
+    printf("%04lx %04lx,",(unsigned long)_n,(unsigned long)_v); \
+    if(_n!=_v) printf("failed\n"); \
+    else printf("ok\n")
+
+int main(void)
+{
+int i;
+unsigned long l;
+
+    printf("\nwithout cast:\n");
+
+    printf("return int\n");
+
+    dotest(i,test1_int_char(),0x76);
+    dotest(i,test1_int_int(),0x5678);
+
+    printf("return long\n");
+
+    dotest(l,test1_long_char(),0x76);
+    dotest(l,test1_long_int(),0x5678);
+    dotest(l,test1_long_long(),0x12345678);
+
+   printf("\nwith cast:\n");
+
+   printf("return int\n");
+
+    dotest(i,test2_int_char(),0x76);
+    dotest(i,test2_int_int(),0x5678);
+
+    printf("return long\n");
+
+    dotest(l,test2_long_char(),0x76);
+    dotest(l,test2_long_int(),0x5678);
+    dotest(l,test2_long_long(),0x12345678);
+
+    return 0;
+}