ARM VERSION 1.2 6.9 VFP directives and vector notation

Vector Floating-point Programming

6.9 VFP directives and vector notation

This section applies only to

armasm

. The inline assemblers in the C and C++ compilers

do not accept these directives or vector notation.

You can make assertions about VFP vector lengths and strides in your code, and have

them checked by the assembler. See:

•VFPASSERT SCALAR on page6-41

•VFPASSERT VECTOR on page6-42.

If you use

VFPASSERT

directives, you must specify vector details in all VFP data

processing instructions. The vector notation is described below. If you do not use

VFPASSERT

directives you must not use this vector notation.

In VFP data processing instructions, specify vectors of VFP registers using angle

brackets:

is a single-precision scalar register

sn<>

is a single-precision vector whose length and stride are given by the current vector

length and stride, starting at register

sn<L>

is a single-precision vector of length L, stride 1, starting at register

sn<L:S>

is a single-pre cision vector of length

, stride

, starting at register

is a double-precision scalar register

dn<>

is a double-precision vector whose length and stride are given by the current vector

length and stride, starting at register

dn<L>

is a double-precision vector of length L, stride 1, starting at register

dn<L:S>

is a double-precision vector of length

, stride

, starting at register

You can use this vector notation with names defined using the

and

directives (see

DN and SN on page7-11).

You must not use this vector notation in the

and

directives themselves.