[PVIPR] vec_cpsgn reverses the meaning of the parameters #74

vec_cpsgn says:

Result value: The value of each element of r is set to the corresponding element of b with its sign replaced by the sign from the corresponding element of a.

However, the implementation returns the elements of a with the signs from b.

`vec_cpsgn` says: > Result value: The value of each element of **r** is set to the corresponding element of **b** with its sign replaced by the sign from the corresponding element of **a**. However, the implementation returns the elements of **a** with the signs from **b**.

To be clear, both instances of "r,b,a" should be changed to "r,a,b".

Thanks for the report!

To be clear, both instances of "r,b,a" should be changed to "r,a,b". Thanks for the report!

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[PVIPR] vec_cpsgn reverses the meaning of the parameters #74