generic-library/opencv
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Move coefficient (32.0f) to the end of every iteration.

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It could reduce 7 multiplications every iteration.

Signed-off-by: Yan Wang <yan.wang@linux.intel.com>
This commit is contained in:
Yan Wang 2015-07-22 11:25:18 +08:00
parent c0b544af70
commit a00eb1e9f5
1 changed files with 3 additions and 4 deletions
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7
modules/video/src/opencl/pyrlk.cl
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@ -253,8 +253,7 @@ inline void GetPatch(image2d_t J, float x, float y,
float* Pch, float* Dx, float* Dy,
float* b1, float* b2)
{
float J_val = read_imagef(J, sampler, (float2)(x, y)).x;
float diff = (J_val - *Pch) * 32.0f;
float diff = read_imagef(J, sampler, (float2)(x,y)).x-*Pch;
*b1 = mad(diff, *Dx, *b1);
*b2 = mad(diff, *Dy, *b2);
}
@ -481,8 +480,8 @@ __kernel void lkSparse(image2d_t I, image2d_t J,
barrier(CLK_LOCAL_MEM_FENCE);
float2 delta;
delta.x = mad(A12, b2, - A22 * b1);
delta.y = mad(A12, b1, - A11 * b2);
delta.x = mad(A12, b2, - A22 * b1) * 32.0f;
delta.y = mad(A12, b1, - A11 * b2) * 32.0f;
prevPt += delta;
loc0 += delta;