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Refactor stridingMemcpyKernel to be unroll friendly #65

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Refactor stridingMemcpyKernel to be unroll friendly #65

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53 changes: 19 additions & 34 deletions kernels.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -27,48 +27,33 @@ __global__ void simpleCopyKernel(unsigned long long loopCount, uint4 *dst, uint4
}
}

constexpr int UNROLL_FACTOR = 12;

__global__ void stridingMemcpyKernel(unsigned int totalThreadCount, unsigned long long loopCount, uint4* dst, uint4* src, size_t chunkSizeInElement) {
unsigned long long from = blockDim.x * blockIdx.x + threadIdx.x;
unsigned long long bigChunkSizeInElement = chunkSizeInElement / 12;
unsigned long long bigChunkSizeInElement = chunkSizeInElement / UNROLL_FACTOR;
dst += from;
src += from;
uint4* dstBigEnd = dst + (bigChunkSizeInElement * 12) * totalThreadCount;
uint4* dstEnd = dst + chunkSizeInElement * totalThreadCount;
unsigned long long processedElements = bigChunkSizeInElement * UNROLL_FACTOR;

for (unsigned int i = 0; i < loopCount; i++) {
uint4* cdst = dst;
uint4* csrc = src;

while (cdst < dstBigEnd) {
uint4 pipe_0 = *csrc; csrc += totalThreadCount;
uint4 pipe_1 = *csrc; csrc += totalThreadCount;
uint4 pipe_2 = *csrc; csrc += totalThreadCount;
uint4 pipe_3 = *csrc; csrc += totalThreadCount;
uint4 pipe_4 = *csrc; csrc += totalThreadCount;
uint4 pipe_5 = *csrc; csrc += totalThreadCount;
uint4 pipe_6 = *csrc; csrc += totalThreadCount;
uint4 pipe_7 = *csrc; csrc += totalThreadCount;
uint4 pipe_8 = *csrc; csrc += totalThreadCount;
uint4 pipe_9 = *csrc; csrc += totalThreadCount;
uint4 pipe_10 = *csrc; csrc += totalThreadCount;
uint4 pipe_11 = *csrc; csrc += totalThreadCount;

*cdst = pipe_0; cdst += totalThreadCount;
*cdst = pipe_1; cdst += totalThreadCount;
*cdst = pipe_2; cdst += totalThreadCount;
*cdst = pipe_3; cdst += totalThreadCount;
*cdst = pipe_4; cdst += totalThreadCount;
*cdst = pipe_5; cdst += totalThreadCount;
*cdst = pipe_6; cdst += totalThreadCount;
*cdst = pipe_7; cdst += totalThreadCount;
*cdst = pipe_8; cdst += totalThreadCount;
*cdst = pipe_9; cdst += totalThreadCount;
*cdst = pipe_10; cdst += totalThreadCount;
*cdst = pipe_11; cdst += totalThreadCount;
for (unsigned long long j = 0; j < bigChunkSizeInElement; j++) {
unsigned long long offset = j * UNROLL_FACTOR * totalThreadCount;

uint4 pipe[UNROLL_FACTOR];
#pragma unroll
for (int k = 0; k < UNROLL_FACTOR; ++k) {
pipe[k] = src[offset + k * totalThreadCount];
}
#pragma unroll
for (int k = 0; k < UNROLL_FACTOR; ++k) {
dst[offset + k * totalThreadCount] = {pipe[k].x, pipe[k].y, pipe[k].z, pipe[k].w};
}
}

while (cdst < dstEnd) {
*cdst = *csrc; cdst += totalThreadCount; csrc += totalThreadCount;
#pragma unroll
for (unsigned long long j = processedElements; j < chunkSizeInElement; j++) {
dst[j * totalThreadCount] = src[j * totalThreadCount];
}
}
}
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