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Assembler User Guide
Conventions and feedback
Overview of the Assembler
Overview of the ARM Architecture
Structure of Assembly Language Modules
Writing ARM Assembly Language
Unified Assembler Language
Subroutines calls
Load immediates into registers
Load immediate values using MOV and MVN
Load 32-bit values to a register using MOV32
Load immediate 32-bit values to a register using L
Literal pools
Load addresses into registers
Load addresses to a register using ADR
Load addresses to a register using ADRL
Load addresses to a register using LDR Rd, =label
Other ways to load and store registers
Load and store multiple register instructions
Load and store multiple instructions available in
Stack implementation using LDM and STM
Stack operations for nested subroutines
Block copy with LDM and STM
Memory accesses
Read-Modify-Write procedure
Optional hash
Use of macros
Test-and-branch macro example
Unsigned integer division macro example
Instruction and directive relocations
Symbol versions
Frame directives
Exception tables and Unwind tables
Assembly language changes after RVCTv2.1
Condition Codes
Using the Assembler
Symbols, Literals, Expressions, and Operators
VFP Programming
Assembler User Guide
Optional hash
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You do not need to specify a hash before immediate constants in any instruction syntax (including ARM, Thumb, and VFP instructions). For example, the following are valid instructions:
BKPT 100 MOVT R1, 256
By default, the assembler warns if you do not specify a hash:
WARNING: A1865W: ‘#’ not seen before constant expression.
This can be suppressed with --diag_suppress=1865.
If you use the assembler code with another assembler, you are advised to use the # before all immediates. The disassembler will always show the # for clarity.
See also- Reference
Assembler Reference:
| Copyright © 2007-2008, 2011-2012 ARM. All rights reserved. | ARM DUI 0379D |
| Non-Confidential | ID062912 |
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| Home > Writing ARM Assembly Language > Optional hash |
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