vec_sum4s

Purpose

Returns a vector containing the results of performing a sum across 1/4 vector operation on two given vectors.

Syntax

d=vec_sum4s(a, b)

Result and argument types

The following table describes the types of the returned value and the function arguments.

Table 1. Types of the returned value and function arguments
d a b
vector signed int vector signed char vector signed int
vector unsigned int vector unsigned char vector unsigned int
vector signed int vector signed short vector signed int

Result value

For each element n of d, the value is obtained as follows:

  • If a is of type vector signed char or vector unsigned char, the value is the saturated addition of elements 4n through 4n+3 of a and element n of b.
    d[0] = a[0]  + a[1]  + a[2]  + a[3]  + b[0]
d[1] = a[4]  + a[5]  + a[6]  + a[7]  + b[1]
d[2] = a[8]  + a[9]  + a[10] + a[11] + b[2]
d[3] = a[12] + a[13] + a[14] + a[15] + b[3]
  • If a is of type vector signed short, the value is the saturated addition of elements 2n through 2n+1 of a and element n of b.
    d[0] = a[0] + a[1] + b[0]
d[1] = a[2] + a[3] + b[1]
d[2] = a[4] + a[5] + b[2]
d[3] = a[6] + a[7] + b[3]