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Race condition bug-fix in hog.cu

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See https://github.com/Itseez/opencv/issues/5721

COMMENTS:
* The second __syncthreads() is necessary, I am sure of that.
* The code works without the first __syncthreads() too, but I have however added it for symmetry. Anyway it doesn't affect time performances, I have checked it with some profiling with nvvp
This commit is contained in:
GabrieleDalmazzone 2015-12-01 09:19:31 +01:00
parent a0f8645541
commit 5a72be08fd
1 changed files with 2 additions and 0 deletions
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2
modules/cudaobjdetect/src/cuda/hog.cu
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@ -331,11 +331,13 @@ namespace cv { namespace cuda { namespace device
if (threadIdx.x < block_hist_size)
elem = hist[0];
__syncthreads(); // prevent race condition (redundant?)
float sum = reduce_smem<nthreads>(squares, elem * elem);
float scale = 1.0f / (::sqrtf(sum) + 0.1f * block_hist_size);
elem = ::min(elem * scale, threshold);
__syncthreads(); // prevent race condition
sum = reduce_smem<nthreads>(squares, elem * elem);
scale = 1.0f / (::sqrtf(sum) + 1e-3f);