This applies only to armasm. The inline assemblers in the C and C++ compilers do not accept these directives or vector notation.

The use of VFP vector mode is deprecated, and vector notation is not supported in UAL. To use vector notation, you must use the pre-UAL VFP mnemonics. See Pre-UAL VFP mnemonics for details. You can mix pre-UAL VFP mnemonics and UAL VFP mnemonics.

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 written using pre-UAL mnemonics. The vector notation is described in Vector notation. If you do not use VFPASSERT directives you must not use this notation.