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:

If you use VFPASSERT directives, you must specify vector details in all VFP data processing instructions. The vector notation is described in Vector notation. If you do not use VFPASSERT directives you must not use this notation.