#define REG_PERF_COUNTER 0x20
#define REG_DESCRIPTOR_ADDRESS 0x50

#define RD32(addr) ((__global volatile uint*)bar)[addr / 4];
#define WR32(addr, value) ((__global volatile uint*)bar)[addr / 4] = value;
#define WR64(addr, value) ((__global volatile ulong*)bar)[addr / 8] = value;

__kernel void process(uint iter, __global uint *input, __global uint *output, __global volatile uint *bar, ulong bus_addr)
{
    WR32 (REG_PERF_COUNTER, 1);
}


__kernel void measure(uint iter, __global uint *input, __global uint *output, __global volatile uint *bar, ulong bus_addr)
{
    output[0] = iter;
    output[iter + 1] = RD32(REG_PERF_COUNTER);
    WR64 (REG_DESCRIPTOR_ADDRESS, bus_addr);
}

__kernel void nil() 
{
    ;
}