This chapter is from the book
This chapter is from the book
This chapter is from the book
This chapter is from the book
Derived Types
The C99 derived types (arrays, structs, unions, and pointers) constructed from the built-in data types described in Tables 4.1 and 4.2 are supported. There are a few restrictions on the use of derived types:
- The struct type cannot contain any pointers if the struct or pointer to a struct is used as an argument type to a kernel function. For example, the following use case is invalid:
typedef struct { int x; global float *f; } mystruct_t; kernel void foo(global mystruct_t *p) // error. mystruct_t contains // a pointer { ... } - The struct type can contain pointers only if the struct or pointer to a struct is used as an argument type to a non-kernel function or declared as a variable inside a kernel or non-kernel function. For example, the following use case is valid:
void my_func(mystruct_t *p) { ... } kernel void foo(global int *p1, global float *p2) { mystruct_t s; s.x = p1[get_global_id(0)]; s.f = p2; my_func(&s); }