2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
//===--- opencl_example.cpp - Example of using Acxxel with OpenCL ---------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// This file is an example of using OpenCL with Acxxel.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "acxxel.h"
|
|
|
|
#include <array>
|
|
#include <cstdio>
|
|
#include <cstring>
|
|
|
|
static const char *SaxpyKernelSource = R"(
|
|
__kernel void saxpyKernel(float A, __global float *X, __global float *Y, int N) {
|
|
int I = get_global_id(0);
|
|
if (I < N)
|
|
X[I] = A * X[I] + Y[I];
|
|
}
|
|
)";
|
|
|
|
template <size_t N>
|
|
void saxpy(float A, std::array<float, N> &X, const std::array<float, N> &Y) {
|
|
acxxel::Platform *OpenCL = acxxel::getOpenCLPlatform().getValue();
|
|
acxxel::Stream Stream = OpenCL->createStream().takeValue();
|
|
auto DeviceX = OpenCL->mallocD<float>(N).takeValue();
|
|
auto DeviceY = OpenCL->mallocD<float>(N).takeValue();
|
|
Stream.syncCopyHToD(X, DeviceX).syncCopyHToD(Y, DeviceY);
|
|
acxxel::Program Program =
|
|
OpenCL
|
|
->createProgramFromSource(acxxel::Span<const char>(
|
|
SaxpyKernelSource, std::strlen(SaxpyKernelSource)))
|
|
.takeValue();
|
|
acxxel::Kernel Kernel = Program.createKernel("saxpyKernel").takeValue();
|
|
float *RawX = static_cast<float *>(DeviceX);
|
|
float *RawY = static_cast<float *>(DeviceY);
|
|
int IntLength = N;
|
|
void *Arguments[] = {&A, &RawX, &RawY, &IntLength};
|
|
size_t ArgumentSizes[] = {sizeof(float), sizeof(float *), sizeof(float *),
|
|
sizeof(int)};
|
|
acxxel::Status Status =
|
|
Stream.asyncKernelLaunch(Kernel, N, Arguments, ArgumentSizes)
|
|
.syncCopyDToH(DeviceX, X)
|
|
.sync();
|
|
if (Status.isError()) {
|
|
std::fprintf(stderr, "Error during saxpy: %s\n",
|
|
Status.getMessage().c_str());
|
|
std::exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
int main() {
|
|
float A = 2.f;
|
|
std::array<float, 3> X{{0.f, 1.f, 2.f}};
|
|
std::array<float, 3> Y{{3.f, 4.f, 5.f}};
|
|
std::array<float, 3> Expected{{3.f, 6.f, 9.f}};
|
|
saxpy(A, X, Y);
|
|
for (int I = 0; I < 3; ++I)
|
|
if (X[I] != Expected[I]) {
|
|
std::fprintf(stderr, "Mismatch at position %d, %f != %f\n", I, X[I],
|
|
Expected[I]);
|
|
std::exit(EXIT_FAILURE);
|
|
}
|
|
}
|