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RealView Compiler Reference Guide
Preface Introduction Compiler Command-line Options Command-line options
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Home > Compiler Command-line Options > Command-line options > ‑‑fpu= | |||
This option enables you to determine the target FPU architecture.
If you specify this option, it overrides any implicit FPU option that appears on the command line, for example, where you use the ‑‑device option.
To obtain a full list of FPU architectures use the ‑‑fpu=list option.
--fpu=name
Where name
noneSelects no floating‑point option. No floating‑point code is to be used. This produces an error if your code contains float types.
vfpv3Selects hardware vector floating‑point unit conforming to architecture VFPv3.
vfpv2Selects hardware vector floating‑point unit conforming to architecture VFPv2. This is the default if you specify
‑‑fpu=vfp.Note
If you enter
armcc ‑‑thumb ‑‑fpu=vfpv2on the command line, the compiler compiles as much of the code using the Thumb instruction set as possible, but hard floating‑point sensitive functions are compiled to ARM code. In this case, the value of the predefine__thumbis not correct.If you specify either
vfporvfpv2with the‑‑armoption for ARM C code you must use the__softfpkeyword to ensure that your interworking ARM code is compiled to use software floating‑point linkage.softvfpSelects software floating‑point linkage. This is the default if you do not specify a
‑‑fpuoption, or if you select a device that does not have an FPU.In previous releases of RVCT, if you specified
‑‑fpu=softvfpand a CPU with implicit VFP hardware, the linker chose a library that implemented the software floating‑point calls using VFP instructions. This is no longer the case. If you require this legacy behavior, use‑‑fpu=softvfp+vfp.softvfp+vfpv2Selects a floating‑point library with software floating‑point linkage that uses VFP instructions. Select this option if you are interworking Thumb code with ARM code on a system that implements a VFP unit.
If you select this option:
Compiling with
‑‑thumbbehaves in a similar way to‑‑fpu=softvfpexcept that it links with floating‑point libraries that use VFP instructions.Compiling with
‑‑armbehaves in a similar way to‑‑fpu=vfpv2except that all functions are given software floating‑point linkage. This means that functions pass and return floating‑point arguments and results in the same way as‑‑fpu=softvfp, but use VFP instructions internally.
Note
If you specify
softvfp+vfpv2with the‑‑armor‑‑thumboption for C code, it ensures that your interworking floating‑point code is compiled to use software floating‑point linkage.softvfp+vfpv3Selects a floating‑point library with software floating‑point linkage that uses VFPv3 instructions. Select this option if you are interworking Thumb code with ARM code on a system that implements a VFPv3 unit.
The --fpu option in the Compiler User Guide
Using the --fpu option in the Compiler User Guide.
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