vec_st, vec_sta

Purpose

Stores a vector to memory at the given address.

Syntax

vec_st(a, b, c)
vec_sta(a, b, c)

Argument types

The following table describes the types of the function arguments.

Result

The effective address (EA) is the sum of b and c. The effective address is truncated to an n-byte alignment depending on the type of c as shown in the following table. The value of a is then stored at the effective address.

vec_sta generates an exception (SIGBUS) if the effective address is not aligned to the appropriate memory boundary indicated in the table.

If c is a pointer to a variable of single-precision floating-point type or single-precision complex type, the elements of a are converted to single precision before being saved to memory.

If c is a pointer to a variable of 4-byte integer type, the four low-order bytes of the elements of a are saved to memory.

Formula

The following table shows the formulas depending on the type of c.

Memory_4B[EA]=a[0]32:63
Memory_4B[EA+4]=a[1]32:63
Memory_4B[EA+8]=a[2]32:63
Memory_4B[EA+12]=a[3]32:63

Memory[EA]=a[0]
Memory[EA+8]=a[1]
Memory[EA+16]=a[2]
Memory[EA+24]=a[3]

Memory_SP[EA]=(float) a[0]
Memory_SP[EA+4]=(float) a[1]
Memory_SP[EA+8]=(float) a[2]
Memory_SP[EA+12]=(float) a[3]

Memory[EA]=a[0]
Memory[EA+8]=a[1]
Memory[EA+16]=a[2]
Memory[EA+24]=a[3]