Using runtime check library

The runtime check library provides a library routine that identifies the target hardware model to the application during its execution. This runtime check library also provides built-in functions that are associated with individual architectures to check for safety of the arch_section directive during application execution.

If you have code sections that are customized for specific hardware, you can use these built-in functions to perform a fast and efficient safety check before entering the customized sections. For more information about the arch_section directive, see #pragma arch_section in z/OS XL C/C++ User's Guide.

Check the type of CPU

void __builtin_cpu_init (void);

This built-in function runs the CPU detection code to check the type of CPU. This function must be invoked along with the __builtin_cpu_is and __builtin_cpu_supports built-in functions to check CPU type and features. This function must be run first so that CPU type is available to __builtin_cpu_is and __builtin_cpu_supports.

int __builtin_cpu_supports(const char* feature); 

int __builtin_cpu_is(const char* cpumodel);

int main() {
    __builtin_cpu_init();
    if (__builtin_cpu_supports("dfp"))
    #pragma arch_section(7)
    // ....
    return SUCCESS;
}