 RealView Compiler User's Guide | |
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RealView Compiler User's Guide
Preface Introduction Getting started with the ARM Compiler Compiler Features Coding Practices Optimizing code
Optimizing for size versus speed Optimization levels and the debug view Selecting the target device Optimizing loops Using volatile Code metrics Measuring code and data sizes Measuring stack use Reducing debug information in objects and librarie Functions Minimizing parameter passing overhead __value_in_regs __pure Placing ARM function qualifiers Inlining How the compiler decides to inline When is it practical for the compiler to inline? Managing inlining Inlining functions across multiple files Debugging data and the --[no]_inline keyword Marking functions as static Setting breakpoints on inlined functions in ROM im Aligning data About data alignment The __packed qualifier and unaligned accesses to d __packed structures versus individually __packed f Using floating-point arithmetic Support for floating-point operations VFP architectures The --fpu option Floating-point linkage The --fpmode option Using the --fpu option VFP support Trapping and identifying division-by-zero errors Integer division (Software) Floating point division Support for ARM architecture v6 Instruction generation Alignment support Endian support Diagnostic Messages Using the Inline and Embedded Assemblers SemihostingSelecting the target device
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| Home > Coding Practices > Optimizing code > Selecting the target device | |||
The compiler supports several devices that are based on different versions of the ARM architecture. You must specify the target device in the command line using the option --device=. If you do not specify the target device, the compiler generates an error. Based on the device you specify, the compiler knows what processor and ARM architecture to compile the code for. This enables it to make full use of the processor’s features and instruction set to optimize the code for the selected device. The compiler also assumes a default floating-point unit architecture and a default endianness based on the device you specify. For some devices, you can specify an additional processor option using name--device_opt=.option
Note
You can list all the devices supported by the compiler using the command-line option --device=list.
For more information see:
‑‑device=list in the Compiler Reference Guide
‑‑device=name in the Compiler Reference Guide
--device_opt=option in the Compiler Reference Guide.
| Copyright © 2007 ARM Limited. All rights reserved. | ARM DUI 0375A |
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