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Optimized memory access by using stride pattern

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This commit is contained in:
Alexander Karsakov 2014-05-16 10:22:03 +04:00
parent 4612b4b827
commit 8ecb8c6a3d
2 changed files with 32 additions and 17 deletions
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41
modules/imgproc/src/opencl/threshold.cl
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@ -56,26 +56,37 @@ __kernel void threshold(__global const uchar * srcptr, int src_step, int src_off
T1 thresh, T1 max_val, T1 min_val)
{
int gx = get_global_id(0);
int gy = get_global_id(1);
int gy = get_global_id(1) * STRIDE_SIZE;
if (gx < cols && gy < rows)
if (gx < cols)
{
int src_index = mad24(gy, src_step, mad24(gx, (int)sizeof(T), src_offset));
int dst_index = mad24(gy, dst_step, mad24(gx, (int)sizeof(T), dst_offset));
T sdata = *(__global const T *)(srcptr + src_index);
__global T * dst = (__global T *)(dstptr + dst_index);
#pragma unroll
for (int i = 0; i < STRIDE_SIZE; i++)
{
if (gy < rows)
{
T sdata = *(__global const T *)(srcptr + src_index);
__global T * dst = (__global T *)(dstptr + dst_index);
#ifdef THRESH_BINARY
dst[0] = sdata > (thresh) ? (T)(max_val) : (T)(0);
#elif defined THRESH_BINARY_INV
dst[0] = sdata > (thresh) ? (T)(0) : (T)(max_val);
#elif defined THRESH_TRUNC
dst[0] = clamp(sdata, (T)min_val, (T)(thresh));
#elif defined THRESH_TOZERO
dst[0] = sdata > (thresh) ? sdata : (T)(0);
#elif defined THRESH_TOZERO_INV
dst[0] = sdata > (thresh) ? (T)(0) : sdata;
#endif
#ifdef THRESH_BINARY
dst[0] = sdata > (thresh) ? (T)(max_val) : (T)(0);
#elif defined THRESH_BINARY_INV
dst[0] = sdata > (thresh) ? (T)(0) : (T)(max_val);
#elif defined THRESH_TRUNC
dst[0] = clamp(sdata, (T)min_val, (T)(thresh));
#elif defined THRESH_TOZERO
dst[0] = sdata > (thresh) ? sdata : (T)(0);
#elif defined THRESH_TOZERO_INV
dst[0] = sdata > (thresh) ? (T)(0) : sdata;
#endif
gy++;
src_index += src_step;
dst_index += dst_step;
}
}
}
}

8
modules/imgproc/src/thresh.cpp
View File

@ -833,9 +833,12 @@ static bool ocl_threshold( InputArray _src, OutputArray _dst, double & thresh, d
const char * const thresholdMap[] = { "THRESH_BINARY", "THRESH_BINARY_INV", "THRESH_TRUNC",
"THRESH_TOZERO", "THRESH_TOZERO_INV" };
ocl::Device dev = ocl::Device::getDefault();
int stride_size = dev.isIntel() && (dev.type() & ocl::Device::TYPE_GPU) ? 4 : 1;
ocl::Kernel k("threshold", ocl::imgproc::threshold_oclsrc,
format("-D %s -D T=%s -D T1=%s%s", thresholdMap[thresh_type],
ocl::typeToStr(ktype), ocl::typeToStr(depth),
format("-D %s -D T=%s -D T1=%s -D STRIDE_SIZE=%d%s", thresholdMap[thresh_type],
ocl::typeToStr(ktype), ocl::typeToStr(depth), stride_size,
doubleSupport ? " -D DOUBLE_SUPPORT" : ""));
if (k.empty())
return false;
@ -856,6 +859,7 @@ static bool ocl_threshold( InputArray _src, OutputArray _dst, double & thresh, d
ocl::KernelArg::Constant(Mat(1, 1, depth, Scalar::all(min_val))));
size_t globalsize[2] = { dst.cols * cn / kercn, dst.rows };
globalsize[1] = (globalsize[1] + stride_size - 1) / stride_size;
return k.run(2, globalsize, NULL, false);
}