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Commit 30a60d39 authored by Chip Kerchner's avatar Chip Kerchner Committed by Alexander Alekhin
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Merge pull request #15274 from ChipKerchner:lkpyramidToHal 

* Convert lkpyramid from SSE SIMD to HAL - 90% faster on Power (VSX).

* Replace stores with reduce_sum.  Rework to handle endianess correctly.

* Fix compiler warnings by casting values explicitly to shorts

* Switch to CV_SIMD128 compiler definition.  Unroll loop to 8 elements since we've already loaded the data.
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modules/video/src/lkpyramid.cpp
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