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Assembler User Guide
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Overview of the Assembler
Overview of the ARM Architecture
Structure of Assembly Language Modules
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VFP Programming
Architecture support for VFP
Half-precision extension
Fused Multiply-Add extension
Extension register bank mapping
VFP views of the extension register bank
Load values to VFP registers
Conditional execution of VFP instructions
Floating-point exceptions
VFP data types
Extended notation
VFP system registers
FPSCR, the floating-point status and control regis
FPEXC, the floating-point exception register
FPSID, the floating-point system ID register
Flush-to-zero mode
When to use flush-to-zero mode
The effects of using flush-to-zero mode
Operations not affected by flush-to-zero mode
VFP vector mode
Vectors in the VFP extension register bank
VFP vector wrap-around
VFP vector stride
Restriction on vector length
Control of scalar, vector, and mixed operations
VFP directives and vector notation
Pre-UAL VFP mnemonics
Vector notation
VFPASSERT SCALAR
VFPASSERT VECTOR
Assembler User Guide
Extended notation
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| Home > VFP Programming > Extended notation | |||
The assembler implements an extension to the architectural VFP assembly syntax, called extended notation. This extension allows you to include datatype information or scalar indexes in register names. If you do this, you do not need to include the datatype or scalar index information in every instruction.
Register names can be any of the following:
- Untyped
The register name specifies the register, but not what datatype it contains, nor any index to a particular scalar within the register.
- Untyped with scalar index
The register name specifies the register, but not what datatype it contains, It specifies an index to a particular scalar within the register.
- Typed
The register name specifies the register, and what datatype it contains, but not any index to a particular scalar within the register.
- Typed with scalar index
The register name specifies the register, what datatype it contains, and an index to a particular scalar within the register.
Use the SN, DN, and QN directives
to create typed and scalar registers.
See also - Concepts
- Reference
Assembler Reference:
| Copyright © 2007-2008, 2011-2012 ARM. All rights reserved. | ARM DUI 0379D |
| Non-Confidential | ID062912 |
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| Home > VFP Programming > Extended notation |
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