ARM Compiler toolchain v4.1 for µVision Using the Compiler

Using the Inline and Embedded Assemblers of the ARM Compiler
7.1 Compiler support for inline assembly language
The compiler provides an inline assembler that enables you to write optimized assembly
language routines, and to access features of the target processor not available from C or C++.
See the following topics:
• Inline assembler support in the compiler on page 7-5
• Restrictions on inline assembler support in the compiler on page 7-6
• Inline assembly language syntax with the __asm keyword in C and C++ on page 7-7
• Inline assembly language syntax with the asm keyword in C++ on page 7-8
• Inline assembler rules for compiler keywords __asm and asm on page 7-9
• Restrictions on inline assembly operations in C and C++ code on page 7-11
• Inline assembler and register access in C and C++ code on page 7-18
• Inline assembler and the # constant expression specifier in C and C++ code on page 7-20
• Inline assembler and instruction expansion in C and C++ code on page 7-21
• Inline assembler effect on processor condition flags in C and C++ code on page 7-24
• Inline assembler operands in C and C++ code on page 7-25
• Inline assembler function calls and branches in C and C++ code on page 7-29
• Inline assembler branches and labels in C and C++ code on page 7-34.
For information on how to use register variables as an alternative to some uses of inline
assembly language:
• Compiler Reference:
— Named register variables on page 5-94.
For information on how to use the inline assembler in C and C++ source code, and restrictions
on inline assembly language:
For more information on writing assembly language for ARM processors:
• Using the Assembler.
For information on significant differences that apply between RVCT and ARM Compiler 4.1:
• Migration and Compatibility:
— Chapter 2 Migrating from RVCT v4.0 for µVision to ARM Compiler v4.1 for
µVision.
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