Input/Output

The io-specifiers tell HyCuda which variables will be used as input or output. When a variable is marked as input (i), output (o) or both (io), HyCuda assumes that these variables already exist on the CPU. Two structs will be declared, Input and Output, containing pointers that should be initialized by the programmer and passed to process to execute the algorithm. HyCuda will make sure that the output will be readily available (on the CPU) when the algorithm returns.

More precisely, both Input and Output contain std::pair's of pointers and sizes (size_t). For example:

 struct Input
 {
     std::pair<float*, size_t> vec1;
     // ...
 }

The value passed as vec1.second will be assigned to the symbolic memorysize specified in the HyCuda spec-file as the size of vec1. See also Section 4 for a detailed example.