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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 SemihostingFloating-point linkage
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| Home > Coding Practices > Using floating-point arithmetic > Floating-point linkage | |||
The --fpu option sets the type of floating-point linkage. In particular, each of the options --fpu softvfp, --fpu softvfp+vfpv2, and --fpu softvfp+vfpv3 selects software floating-point linkage.
When software floating-point linkage is used, either:
the calling function and the called function must be compiled using one of the options
--softvfp,--fpu softvfp+vfpv2, or --fpu softvfp+vfpv3the calling function and the called function must be declared using the
__softfpkeyword.
Each of the options --fpu softvfp, --fpu softvfp+vfpv2 and --fpu softvfp+vfpv3 specify software floating-point linkage across the whole file. In contrast, the __softfp keyword enables software floating-point linkage to be specified on a function by function basis.
For more information see:
‑‑fpu=name in the Compiler Reference Guide
__softfp in the Compiler Reference Guide
#pragma [no_]softfp_linkage in the Compiler Reference Guide.
| Copyright © 2007 ARM Limited. All rights reserved. | ARM DUI 0375A |
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