 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 SemihostingWhen is it practical for the compiler to inline?
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| Home > Coding Practices > Inlining > When is it practical for the compiler to inline? | |||
The compiler decides for itself when it is practical to inline a function or not, depending on a number of conditions, including:
the size of the function, and how many times it is called
the current optimization level
whether it is optimizing for speed (
-Otime) or size (-Ospace)whether the function has external or static linkage.
Ultimately, the compiler can decide not to inline a function, even if the function is qualified with __forceinline. As a general rule:
smaller functions stand a better chance of being inlined
compiling with
-Otimeincreases the likelihood that a function is inlinedlarge functions are not normally inlined because this can adversely affect code density and performance.
| Copyright © 2007 ARM Limited. All rights reserved. | ARM DUI 0375A |
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