Specifying Inline Assembly Statements

To specify that a block of C or C++ source code should be interpreted as assembly language, use the asm keyword.

Note: To ensure that the C/C++ compiler recognizes the asm keyword, you must clear the ANSI Keywords Only checkbox in the C/C++ Language panel.

As an alternative, the compiler also recognizes the keyword __asm even if the ANSI Keywords Only checkbox is checked.

There are a few ways to use assembly language with the CodeWarrior compilers.

Function-level assembly language: an entire function is in assembly language.
Statement-level assembly language: mix assembly language with regular C or C++ statements.
Intrinsic functions: the compiler makes some assembly instructions available as functions that your program calls as regular C or C++ functions.

Keep these tips in mind as you write inline assembly statements:

All statements must follow this syntax:
[label:] (instruction | directive) [operands]
Each inline assembly statement must end with a newline or a semicolon (;).
Hexadecimal constants must be in C-style.
For example: mov r3, #0xAB
Assembler directives, instructions, and registers are case-insensitive.