void generate(OutputIterator first_ctr, OutputIterator last_ctr, OutputIterator first_key, OutputIterator last_key, command_queue &queue) {
const size_t size_ctr = detail::iterator_range_size(first_ctr, last_ctr);
const size_t size_key = detail::iterator_range_size(first_key, last_key);
if(!size_ctr || !size_key || (size_ctr != size_key)) {
return;
}
kernel rng_kernel = m_program.create_kernel("generate_rng");
rng_kernel.set_arg(0, first_ctr.get_buffer());
rng_kernel.set_arg(1, first_key.get_buffer());
size_t offset = 0;
for(;;){
size_t count = 0;
size_t size = size_ctr/2;
if(size > threads){
count = threads;
}
else {
count = size;
}
rng_kernel.set_arg(2, static_cast<const uint_>(offset));
queue.enqueue_1d_range_kernel(rng_kernel, 0, count, 0);
offset += count;
if(offset >= size){
break;
}
}
}
void fill(OutputIterator first, OutputIterator last, command_queue &queue)
{
const buffer &buffer = first.get_buffer();
const size_t size = detail::iterator_range_size(first, last);
kernel fill_kernel(m_program, "fill");
fill_kernel.set_arg(0, m_state_buffer);
fill_kernel.set_arg(1, buffer);
size_t p = 0;
for(;;){
size_t count = 0;
if(size - p >= n)
count = n;
else
count = size - p;
fill_kernel.set_arg(2, static_cast<uint_>(p));
queue.enqueue_1d_range_kernel(fill_kernel, 0, count, 0);
p += n;
if(p >= size)
break;
generate_state(queue);
}
}
void generate(OutputIterator first, OutputIterator last, command_queue &queue)
{
const size_t size = detail::iterator_range_size(first, last);
kernel fill_kernel(m_program, "fill");
fill_kernel.set_arg(0, m_state_buffer);
fill_kernel.set_arg(2, first.get_buffer());
size_t offset = 0;
size_t &p = m_state_index;
for(;;){
size_t count = 0;
if(size > n){
count = n;
}
else {
count = size;
}
fill_kernel.set_arg(1, static_cast<const uint_>(p));
fill_kernel.set_arg(3, static_cast<const uint_>(offset));
queue.enqueue_1d_range_kernel(fill_kernel, 0, count, 0);
p += count;
offset += count;
if(offset >= size){
break;
}
generate_state(queue);
p = 0;
}
}
void generate(OutputIterator first, OutputIterator last, command_queue &queue)
{
size_t size = detail::iterator_range_size(first, last);
kernel fill_kernel(m_program, "fill");
fill_kernel.set_arg(1, m_multiplicands);
fill_kernel.set_arg(2, first.get_buffer());
size_t offset = 0;
for(;;){
size_t count = 0;
if(size > threads){
count = threads;
}
else {
count = size;
}
fill_kernel.set_arg(0, static_cast<const uint_>(m_seed));
fill_kernel.set_arg(3, static_cast<const uint_>(offset));
queue.enqueue_1d_range_kernel(fill_kernel, 0, count, 0);
offset += count;
if(offset >= size){
break;
}
update_seed(queue);
}
}
void generate(OutputIterator first_ctr, OutputIterator last_ctr, command_queue &queue) {
const size_t size_ctr = detail::iterator_range_size(first_ctr, last_ctr);
if(!size_ctr) {
return;
}
boost::compute::vector<uint_> vector_key(size_ctr, m_context);
vector_key.assign(size_ctr, 0, queue);
kernel rng_kernel = m_program.create_kernel("generate_rng");
rng_kernel.set_arg(0, first_ctr.get_buffer());
rng_kernel.set_arg(1, vector_key);
size_t offset = 0;
for(;;){
size_t count = 0;
size_t size = size_ctr/2;
if(size > threads){
count = threads;
}
else {
count = size;
}
rng_kernel.set_arg(2, static_cast<const uint_>(offset));
queue.enqueue_1d_range_kernel(rng_kernel, 0, count, 0);
offset += count;
if(offset >= size){
break;
}
}
}
inline future<OutputIterator>
dispatch_copy_async(InputIterator first,
InputIterator last,
OutputIterator result,
command_queue &queue,
typename boost::enable_if<
mpl::and_<
is_device_iterator<InputIterator>,
is_device_iterator<OutputIterator>,
can_copy_with_copy_buffer<
InputIterator, OutputIterator
>
>
>::type* = 0)
{
typedef typename std::iterator_traits<InputIterator>::value_type value_type;
typedef typename std::iterator_traits<InputIterator>::difference_type difference_type;
difference_type n = std::distance(first, last);
if(n < 1){
// nothing to copy
return make_future(result, event());
}
event event_ =
queue.enqueue_copy_buffer(
first.get_buffer(),
result.get_buffer(),
first.get_index() * sizeof(value_type),
result.get_index() * sizeof(value_type),
static_cast<size_t>(n) * sizeof(value_type)
);
return make_future(result + n, event_);
}
inline command_queue
default_queue_for_copy(InputIterator first,
OutputIterator result,
typename boost::enable_if<
typename boost::mpl::and_<
boost::mpl::not_<is_buffer_iterator<InputIterator> >,
is_buffer_iterator<OutputIterator>
>
>::type* = 0)
{
(void) first;
const buffer &buffer = result.get_buffer();
const context &context = buffer.get_context();
const device &device = context.get_device();
return command_queue(context, device);
}
inline OutputIterator
dispatch_copy(InputIterator first,
InputIterator last,
OutputIterator result,
command_queue &queue,
typename boost::enable_if_c<
boost::is_same<
InputIterator,
buffer_iterator<typename InputIterator::value_type>
>::value &&
boost::is_same<
OutputIterator,
buffer_iterator<typename OutputIterator::value_type>
>::value &&
boost::is_same<
typename InputIterator::value_type,
typename OutputIterator::value_type
>::value
>::type* = 0)
{
typedef typename std::iterator_traits<InputIterator>::value_type value_type;
typedef typename std::iterator_traits<InputIterator>::difference_type difference_type;
difference_type n = std::distance(first, last);
if(n < 1){
// nothing to copy
return first;
}
queue.enqueue_copy_buffer(first.get_buffer(),
result.get_buffer(),
first.get_index() * sizeof(value_type),
result.get_index() * sizeof(value_type),
static_cast<size_t>(n) * sizeof(value_type));
return result + n;
}
size_t reduce(InputIterator first,
size_t count,
OutputIterator result,
size_t block_size,
BinaryFunction function,
command_queue &queue)
{
typedef typename
std::iterator_traits<InputIterator>::value_type
input_type;
typedef typename
boost::compute::result_of<BinaryFunction(input_type, input_type)>::type
result_type;
const context &context = queue.get_context();
size_t block_count = count / 2 / block_size;
size_t total_block_count =
static_cast<size_t>(std::ceil(float(count) / 2.f / float(block_size)));
if(block_count != 0){
meta_kernel k("block_reduce");
size_t output_arg = k.add_arg<result_type *>(memory_object::global_memory, "output");
size_t block_arg = k.add_arg<input_type *>(memory_object::local_memory, "block");
k <<
"const uint gid = get_global_id(0);\n" <<
"const uint lid = get_local_id(0);\n" <<
// copy values to local memory
"block[lid] = " <<
function(first[k.make_var<uint_>("gid*2+0")],
first[k.make_var<uint_>("gid*2+1")]) << ";\n" <<
// perform reduction
"for(uint i = 1; i < " << uint_(block_size) << "; i <<= 1){\n" <<
" barrier(CLK_LOCAL_MEM_FENCE);\n" <<
" uint mask = (i << 1) - 1;\n" <<
" if((lid & mask) == 0){\n" <<
" block[lid] = " <<
function(k.expr<input_type>("block[lid]"),
k.expr<input_type>("block[lid+i]")) << ";\n" <<
" }\n" <<
"}\n" <<
// write block result to global output
"if(lid == 0)\n" <<
" output[get_group_id(0)] = block[0];\n";
kernel kernel = k.compile(context);
kernel.set_arg(output_arg, result.get_buffer());
kernel.set_arg(block_arg, local_buffer<input_type>(block_size));
queue.enqueue_1d_range_kernel(kernel,
0,
block_count * block_size,
block_size);
}
// serially reduce any leftovers
if(block_count * block_size * 2 < count){
size_t last_block_start = block_count * block_size * 2;
meta_kernel k("extra_serial_reduce");
size_t count_arg = k.add_arg<uint_>("count");
size_t offset_arg = k.add_arg<uint_>("offset");
size_t output_arg = k.add_arg<result_type *>(memory_object::global_memory, "output");
size_t output_offset_arg = k.add_arg<uint_>("output_offset");
k <<
k.decl<result_type>("result") << " = \n" <<
first[k.expr<uint_>("offset")] << ";\n" <<
"for(uint i = offset + 1; i < count; i++)\n" <<
" result = " <<
function(k.var<result_type>("result"),
first[k.var<uint_>("i")]) << ";\n" <<
"output[output_offset] = result;\n";
kernel kernel = k.compile(context);
kernel.set_arg(count_arg, static_cast<uint_>(count));
kernel.set_arg(offset_arg, static_cast<uint_>(last_block_start));
kernel.set_arg(output_arg, result.get_buffer());
kernel.set_arg(output_offset_arg, static_cast<uint_>(block_count));
queue.enqueue_task(kernel);
}
return total_block_count;
}