9.22 Overview of VFP directives and vector notation

To use vector notation, you must use pre-UAL syntax and mnemonics. You can use assembler directives to check you are using the correct syntax.

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 mnemonics. 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, by using the following directives:

  • VFPASSERT SCALAR.

  • VFPASSERT VECTOR.

If you use the VFPASSERT directives, you must specify vector details in all VFP data processing instructions written using pre-UAL mnemonics. If you do not use the VFPASSERT directives you must not use this notation.

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