vec_sra

Purpose

Performs an algebraic right shift for each element of a vector.

Syntax

d=vec_sra(a, b)

Result and argument types

The following tables describe the types of the returned value and the function arguments.

Table 1. Result and argument types
d	a	b
vector signed char	vector signed char	vector unsigned char
vector unsigned char	vector unsigned char	vector unsigned char
vector signed short	vector signed short	vector unsigned short
vector unsigned short	vector unsigned short	vector unsigned short
vector signed int	vector signed int	vector unsigned int
vector unsigned int	vector unsigned int	vector unsigned int

Note: The following types are valid when -mcpu is set to target POWER7 processors, or higher. However, compiling with POWER8 processors or higher yields more efficient code generation by utilizing the available POWER8 instructions.

Table 2. Result and argument types
d	a	b
vector signed long long	vector signed long long	vector unsigned long long
vector unsigned long long	vector unsigned long long	vector unsigned long long

Result value

Each element of the result vector is the result of algebraically right shifting the corresponding element of a by the number of bits specified by the value of the corresponding element of b, modulo the number of bits in the element. The bits that are shifted out are replaced by copies of the most significant bit of the element of a.