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computecpp-sdk/samples/template-function-object.cpp at master · codeplaysoftware/computecpp-sdk · GitHub
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/*
**************************************************************************
*
* Copyright (C) 2016 Codeplay Software Limited
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* For your convenience, a copy of the License has been included in this
* repository.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Codeplay's ComputeCpp SDK
*
* template-function-object.cpp
*
* Description:
* Sample code that demonstrates how to template function objects in SYCL.
*
*************************************************************************
*/
#
include
<
CL/sycl.hpp
>
#
include
<
algorithm
>
#
include
<
functional
>
#
include
<
iostream
>
#
include
<
vector
>
using
namespace
cl
::sycl
;
using
namespace
std
::placeholders
;
/*
In SYCL, C++ classes can be used as kernels - not just lambdas. One
* requirement is that the class must be standard layout, which is used
* to provide certain guarantees to the runtime. C++ Reference has a good
* description of standard layout at:
* http://en.cppreference.com/w/cpp/language/data_members#Standard_layout
*
* This template class defines a kernel function that performs a vector add.
* It contains three accessors: two inputs that are access::mode::read and an
* output that is access::mode::write. A templated class allows you to have a
* generic kernel that can be instantiated over different types.
*/
template
<
typename
dataT>
class
vector_add_kernel
{
public:
using
read_accessor =
accessor<dataT,
1
, access::mode::read, access::target::global_buffer>;
using
write_accessor =
accessor<dataT,
1
, access::mode::write, access::target::global_buffer>;
vector_add_kernel
(read_accessor ptrA, read_accessor ptrB, write_accessor ptrC)
: m_ptrA(ptrA), m_ptrB(ptrB), m_ptrC(ptrC) {}
/*
We define this object's function call operator to match the parallel_for
* call which takes a range rather than an nd_range. operator()() takes an
* item rather than an nd_item.
*/
void
operator
()(item<
1
> item) {
/*
This is a standard vector add, as seen in other samples.
*/
m_ptrC[item.
get_id
()] = m_ptrA[item.
get_id
()] + m_ptrB[item.
get_id
()];
}
private:
read_accessor m_ptrA;
read_accessor m_ptrB;
write_accessor m_ptrC;
};
/*
This function will be bound to later on in the kernel submission code.
*/
template
<
typename
dataT>
void
vector_add
(buffer<dataT,
1
>* a, buffer<dataT,
1
>* b, buffer<dataT,
1
>* c,
int
count, handler& cgh) {
auto
a_dev = a->
template
get_access
<access::mode::read>(cgh);
auto
b_dev = b->
template
get_access
<access::mode::read>(cgh);
auto
c_dev = c->
template
get_access
<access::mode::write>(cgh);
cgh.
parallel_for
(range<
1
>(count),
vector_add_kernel<dataT>(a_dev, b_dev, c_dev));
}
/*
Using the code above, two vector additions are performed: one on ints,
* the other on floats.
*/
int
main
() {
const
unsigned
count =
1024
;
bool
pass =
false
;
queue myQueue;
try
{
std::vector<
float
>
a
(count),
b
(count),
c
(count);
std::fill
(a.
begin
(), a.
end
(),
0
.
f
);
std::fill
(b.
begin
(), b.
end
(),
1
.
f
);
{
buffer<
float
,
1
>
bufA
(a.
data
(), range<
1
>(count));
buffer<
float
,
1
>
bufB
(b.
data
(), range<
1
>(count));
buffer<
float
,
1
>
bufC
(c.
data
(), range<
1
>(count));
/*
We create a function object for the command_group by using std::bind
* with the vector_add function template and the accessor and scalar
* parameters. This submission instantiates the template with float.
*/
myQueue.
submit
(
std::bind
(vector_add<
float
>, &bufA, &bufB, &bufC, count, _1));
}
/*
Check the results after the data is copied back to the host.
*/
pass =
std::all_of
(c.
begin
(), c.
end
(), [](
float
i) {
return
i ==
1
.
0f
; });
}
catch
(exception e) {
std::cout <<
"
SYCL exception caught:
"
<< e.
what
();
return
1
;
}
try
{
std::vector<
int
>
a
(count),
b
(count),
c
(count);
std::fill
(a.
begin
(), a.
end
(),
0
.
f
);
std::fill
(b.
begin
(), b.
end
(),
1
.
f
);
{
buffer<
int
,
1
>
bufA
(a.
data
(), range<
1
>(count));
buffer<
int
,
1
>
bufB
(b.
data
(), range<
1
>(count));
buffer<
int
,
1
>
bufC
(c.
data
(), range<
1
>(count));
/*
This is the same as above, except we now instantiate for int.
*/
myQueue.
submit
(
std::bind
(vector_add<
int
>, &bufA, &bufB, &bufC, count, _1));
}
pass =
pass &&
std::all_of
(c.
begin
(), c.
end
(), [](
int
i) {
return
i ==
1
; });
}
catch
(exception e) {
std::cout <<
"
SYCL exception caught:
"
<< e.
what
();
return
1
;
}
if
(pass) {
std::cout <<
"
The results are as expected.
"
<< std::endl;
return
0
;
}
else
{
std::cout <<
"
The results are not as expected.
"
<< std::endl;
return
1
;
}
}
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