static void get(backend::source_generator &src,
const ccsr_product<val_t, col_t, idx_t, T>&,
const backend::command_queue&, const std::string &prm_name,
detail::kernel_generator_state_ptr)
{
typedef decltype(val_t() * T()) res_t;
src.function<res_t>(prm_name + "_spmv")
.open("(")
.template parameter< global_ptr<const idx_t> >("idx")
.template parameter< global_ptr<const idx_t> >("row")
.template parameter< global_ptr<const col_t> >("col")
.template parameter< global_ptr<const val_t> >("val")
.template parameter< global_ptr<const T> >("vec")
.template parameter< size_t >("i")
.close(")").open("{");
src.new_line() << type_name<res_t>() << " sum = 0;";
src.new_line() << "for(size_t pos = idx[i], j = row[pos], end = row[pos+1]; j < end; ++j)";
src.open("{");
src.new_line() << "sum += val[j] * vec[i + col[j]];";
src.close("}");
src.new_line() << "return sum;";
src.close("}");
}
static void local_terminal_init(const Vector &x, backend::source_generator &src,
const backend::command_queue &q, const std::string &prm_name,
detail::kernel_generator_state_ptr state)
{
typedef typename detail::return_type<Vector>::type x_type;
typedef spmv_ops_impl<Val, x_type> spmv_ops;
spmv_ops::decl_accum_var(src, prm_name + "_sum");
src.open("{");
// ELL part
src.new_line() << "for(size_t j = 0; j < " << prm_name << "_ell_width; ++j)";
src.open("{");
src.new_line() << type_name<Col>() << " nnz_idx = idx + j * " << prm_name << "_ell_pitch;";
src.new_line() << type_name<Col>() << " c = " << prm_name << "_ell_col[nnz_idx];";
src.new_line() << "if (c != (" << type_name<Col>() << ")(-1))";
src.open("{");
src.new_line() << type_name<Col>() << " idx = c;";
{
detail::output_local_preamble init_x(src, q, prm_name + "_x", state);
boost::proto::eval(boost::proto::as_child(x), init_x);
backend::source_generator vec_value;
detail::vector_expr_context expr_x(vec_value, q, prm_name + "_x", state);
boost::proto::eval(boost::proto::as_child(x), expr_x);
spmv_ops::append_product(src, prm_name + "_sum", prm_name + "_ell_val[nnz_idx]", vec_value.str());
}
src.close("} else break;");
src.close("}");
// CSR part
src.new_line() << "if (" << prm_name << "_csr_ptr)";
src.open("{");
src.new_line() << type_name<Ptr>() << " csr_beg = " << prm_name << "_csr_ptr[idx];";
src.new_line() << type_name<Ptr>() << " csr_end = " << prm_name << "_csr_ptr[idx+1];";
src.new_line() << "for(" << type_name<Ptr>() << " j = csr_beg; j < csr_end; ++j)";
src.open("{");
src.new_line() << type_name<Col>() << " idx = " << prm_name << "_csr_col[j];";
{
detail::output_local_preamble init_x(src, q, prm_name + "_x", state);
boost::proto::eval(boost::proto::as_child(x), init_x);
backend::source_generator vec_value;
detail::vector_expr_context expr_x(vec_value, q, prm_name + "_x", state);
boost::proto::eval(boost::proto::as_child(x), expr_x);
spmv_ops::append_product(src, prm_name + "_sum", prm_name + "_csr_val[j]", vec_value.str());
}
src.close("}");
src.close("}");
src.close("}");
}
static void local_terminal_init(const Vector &x, backend::source_generator &src,
const backend::command_queue &q, const std::string &prm_name,
detail::kernel_generator_state_ptr state)
{
typedef typename detail::return_type<Vector>::type x_type;
typedef decltype(std::declval<Val>() * std::declval<x_type>()) res_type;
src.new_line()
<< type_name<res_type>() << " " << prm_name << "_sum = "
<< res_type() << ";";
src.new_line() << "if (" << prm_name << "_ptr)";
src.open("{");
src.new_line() << type_name<Ptr>() << " row_beg = " << prm_name << "_ptr[idx];";
src.new_line() << type_name<Ptr>() << " row_end = " << prm_name << "_ptr[idx+1];";
src.new_line() << "for(" << type_name<Ptr>() << " j = row_beg; j < row_end; ++j)";
src.open("{");
src.new_line() << type_name<Col>() << " idx = " << prm_name << "_col[j];";
detail::output_local_preamble init_x(src, q, prm_name + "_x", state);
boost::proto::eval(boost::proto::as_child(x), init_x);
src.new_line() << prm_name << "_sum += " << prm_name << "_val[j] * ";
detail::vector_expr_context expr_x(src, q, prm_name + "_x", state);
boost::proto::eval(boost::proto::as_child(x), expr_x);
src << ";";
src.close("}");
src.close("}");
}
inline void twiddle_code(backend::source_generator &o) {
o.function<T2>("twiddle").open("(")
.template parameter<T>("alpha")
.close(")").open("{");
if(std::is_same<T, cl_double>::value) {
// use sincos with double since we probably want higher precision
#ifndef VEXCL_BACKEND_CUDA
o.new_line() << type_name<T>() << " cs, sn = sincos(alpha, &cs);";
#else
o.new_line() << type_name<T>() << " sn, cs;";
o.new_line() << "sincos(alpha, &sn, &cs);";
#endif
o.new_line() << type_name<T2>() << " r = {cs, sn};";
} else {
// use native with float since we probably want higher performance
#ifndef VEXCL_BACKEND_CUDA
o.new_line() << type_name<T2>() << " r = {"
"native_cos(alpha), native_sin(alpha)};";
#else
o.new_line() << type_name<T>() << " sn, cs;";
o.new_line() << "__sincosf(alpha, &sn, &cs);";
o.new_line() << type_name<T2>() << " r = {cs, sn};";
#endif
}
o.new_line() << "return r;";
o.close("}");
}
inline void kernel_radix(backend::source_generator &o, pow radix, bool invert) {
o << in_place_dft(radix.value, invert);
// kernel.
o.kernel("radix").open("(")
.template parameter< global_ptr<const T2> >("x")
.template parameter< global_ptr< T2> >("y")
.template parameter< cl_uint >("p")
.template parameter< cl_uint >("threads")
.close(")").open("{");
o.new_line() << "const size_t i = " << o.global_id(0) << ";";
o.new_line() << "if(i >= threads) return;";
// index in input sequence, in 0..P-1
o.new_line() << "const size_t k = i % p;";
o.new_line() << "const size_t batch_offset = " << o.global_id(1) << " * threads * " << radix.value << ";";
// read
o.new_line() << "x += i + batch_offset;";
for(size_t i = 0; i < radix.value; ++i)
o.new_line() << type_name<T2>() << " v" << i << " = x[" << i << " * threads];";
// twiddle
o.new_line() << "if(p != 1)";
o.open("{");
for(size_t i = 1; i < radix.value; ++i) {
const T alpha = -boost::math::constants::two_pi<T>() * i / radix.value;
o.new_line() << "v" << i << " = mul(v" << i << ", twiddle("
<< "(" << type_name<T>() << ")" << std::setprecision(16) << alpha << " * k / p));";
}
o.close("}");
// inplace DFT
o.new_line() << "dft" << radix.value;
param_list(o, "&", 0, radix.value);
o << ";";
// write back
o.new_line() << "const size_t j = k + (i - k) * " << radix.value << ";";
o.new_line() << "y += j + batch_offset;";
for(size_t i = 0; i < radix.value; i++)
o.new_line() << "y[" << i << " * p] = v" << i << ";";
o.close("}");
}
inline void mul_code(backend::source_generator &o, bool invert) {
o.function<T2>("mul").open("(")
.template parameter<T2>("a")
.template parameter<T2>("b")
.close(")").open("{");
if(invert) { // conjugate b
o.new_line() << type_name<T2>() << " r = {"
"a.x * b.x + a.y * b.y, "
"a.y * b.x - a.x * b.y};";
} else {
o.new_line() << type_name<T2>() << " r = {"
"a.x * b.x - a.y * b.y, "
"a.y * b.x + a.x * b.y};";
}
o.new_line() << "return r;";
o.close("}");
}
static void define(backend::source_generator &src, const std::string &fname)
{
const size_t N = cl_vector_length<T>::value;
typedef typename std::conditional<
sizeof(T) < 32, cl_uint, cl_ulong
>::type ctr_t;
const size_t ctr_n = sizeof(T) <= 8 ? 2 : 4;
typedef typename Generator::template function<ctr_t, ctr_n> generator;
const size_t key_n = generator::K;
generator::define(src);
src.begin_function<T>(fname);
src.begin_function_parameters();
src.template parameter<cl_ulong>("prm1");
src.template parameter<cl_ulong>("prm2");
src.end_function_parameters();
src.new_line() << "union ";
src.open("{");
src.new_line() << type_name<ctr_t>() << " ctr[" << ctr_n << "];";
if (std::is_same<Ts, cl_float>::value) {
src.new_line()
<< type_name<cl_uint>() << " res_i[" << N << "];";
src.new_line()
<< type_name<cl_float>() << " res_f[" << N << "];";
} else if (std::is_same<Ts, cl_double>::value) {
src.new_line()
<< type_name<cl_ulong>() << " res_i[" << N << "];";
src.new_line()
<< type_name<cl_double>() << " res_f[" << N << "];";
}
src.new_line() << type_name<T>() << " res;";
src.close("} ctr;");
src.new_line() << type_name<ctr_t>() << " key[" << key_n << "];";
for(size_t i = 0; i < ctr_n; i += 2)
src.new_line()
<< "ctr.ctr[" << i << "] = prm1; "
<< "ctr.ctr[" << i + 1 << "] = prm2;";
for(size_t i = 0; i < key_n; ++i)
src.new_line() << "key[" << i << "] = 0x12345678;";
src.new_line() << generator::name() << "(ctr.ctr, key);";
if(std::is_same<Ts, cl_float>::value) {
for(size_t i = 0; i < N; ++i)
src.new_line()
<< "ctr.res_f[" << i << "] = ctr.res_i[" << i
<< "] / " << std::numeric_limits<cl_uint>::max()
<< ".0f;";
} else if (std::is_same<Ts, cl_double>::value) {
for(size_t i = 0; i < N; ++i)
src.new_line()
<< "ctr.res_f[" << i << "] = ctr.res_i[" << i
<< "] / " << std::numeric_limits<cl_ulong>::max()
<< ".0;";
}
src.new_line() << "return ctr.res;";
src.end_function();
}
static void define(backend::source_generator &src, const std::string &fname)
{
const size_t N = cl_vector_length<T>::value;
const bool is_float = std::is_same<Ts, cl_float>::value;
const size_t ctr_n = is_float ? 2 : 4;
typedef typename Generator::template function<cl_uint, ctr_n> generator;
const size_t key_n = generator::K;
generator::define(src);
src.begin_function<T>(fname);
src.begin_function_parameters();
src.template parameter<cl_ulong>("prm1");
src.template parameter<cl_ulong>("prm2");
src.end_function_parameters();
#if defined(VEXCL_BACKEND_JIT)
src.new_line() << "#define cospi(x) cos(M_PI * (x))";
#endif
src.new_line() << "union ";
src.open("{");
src.new_line() << type_name<cl_uint>() << " ctr[" << ctr_n << "];";
if (is_float) {
src.new_line() << type_name<cl_uint>() << " res_i[2];";
} else {
src.new_line() << type_name<cl_ulong>() << " res_i[2];";
}
src.close("} ctr;");
src.new_line() << type_name<Ts>() << " u[2];";
src.new_line() << type_name<cl_uint>() << " key[" << key_n << "];";
for(size_t i = 0; i < ctr_n; i += 2)
src.new_line()
<< "ctr.ctr[" << i << "] = prm1; "
<< "ctr.ctr[" << i + 1 << "] = prm2;";
for(size_t i = 0; i < key_n; ++i)
src.new_line() << "key[" << i << "] = 0x12345678;";
if (N > 1) {
src.new_line() << "union ";
src.open("{");
src.new_line() << type_name<Ts>() << " z[" << N << "];";
src.new_line() << type_name<T>() << " v;";
src.close("} res;");
}
for(size_t i = 0 ; i < N ; i += 2) {
src.new_line() << generator::name() << "(ctr.ctr, key);";
if(is_float) {
for(size_t i = 0; i < 2; ++i)
src.new_line()
<< "u[" << i << "] = ctr.res_i[" << i
<< "] / " << std::numeric_limits<cl_uint>::max()
<< ".0f;";
} else {
for(size_t i = 0; i < 2; ++i)
src.new_line()
<< "u[" << i << "] = ctr.res_i[" << i
<< "] / " << std::numeric_limits<cl_ulong>::max()
<< ".0;";
}
if(N == 1) {
src.new_line()
<< "return sqrt(-2 * log(u[0])) * cospi(2 * u[1]);\n";
} else {
src.open("{");
src.new_line() << type_name<Ts>()
<< " l = sqrt(-2 * log(u[0])), cs, sn;";
#if defined(VEXCL_BACKEND_CUDA)
src.new_line() << "sincospi(2 * u[1], &sn, &cs);";
#else
src.new_line() << "sn = sincos("
<< std::setprecision(16)
<< boost::math::constants::two_pi<double>()
<< " * u[1], &cs);";
#endif
src.new_line() << "res.z[" << i << "] = l * cs;";
src.new_line() << "res.z[" << i + 1 << "] = l * sn;";
src.close("}");
}
}
if (N > 1)
src.new_line() << "return res.v;";
src.end_function();
}