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added code to explain rotate.hh

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Ahmet Inan 2019-09-24 10:49:18 +02:00
commit 2b25cd3dcc
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@ -89,5 +89,17 @@ Single instruction, multiple data ([SIMD](https://en.wikipedia.org/wiki/SIMD)) w
### [rotate.hh](rotate.hh) ### [rotate.hh](rotate.hh)
([SIMD](https://en.wikipedia.org/wiki/SIMD)) element wise horizontal rotation [SIMD](https://en.wikipedia.org/wiki/SIMD) element wise horizontal rotation
It computes the following, but faster:
```
SIMD<int8_t, SIZE> rotate(SIMD<int8_t, SIZE> input, int shift, int WIDTH)
{
SIMD<int8_t, SIZE> output;
for (int n = 0; n < WIDTH; ++n)
output.v[(n + shift + WIDTH) % WIDTH] = input.v[n];
return output;
}
```