hal: vsx: further optimize v_signmask#15235
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opencv-pushbot merged 1 commit intoopencv:3.4from Aug 6, 2019
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Use the quadword bit permutation instruction to creatively move the sign bits to create the mask. Note that values above 127 will result in 0.
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Use the quadword bit permutation instruction to creatively move
the sign bits to create the mask. Note that permute values above 127
will result in 0 in the respective bit position.
This results in a 5-15% speedup in the houghlines imgproc benchmarks.
Otherwise, no change is observed.