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Compiling Programs Language Extensions Preprocessor Advanced Programming Error Messages Library Reference AppendixInstruction Sets
The CARM Compiler generates programs using the ARM and THUMB instruction sets for the ARM7 architecture. The instruction set is chosen by a compiler directive. By default, the CARM Compiler generates programs using THUMB instructions.
- ARM instructions are 32-bit instructions that occupy four bytes. You may specify that the compiler generate ARM code (using the ARM directive) for all functions or by using the __arm function attribute on a function-by-function basis.
- THUMB instructions are a compressed version of the ARM instructions that occupy only 16-bits (two bytes). You may specify that the compiler generate THUMB code (using the THUMB directive) for all functions or by using the __thumb function attribute on a function-by-function basis.
Since it supports both instruction sets, the Keil CARM Compiler is said to support ARM7TDMI and ARM9TDMI.
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