If the processor specified with
--cpu has a VFP coprocessor, the default
target FPU architecture is the VFP architecture for that processor. For example, the option
--cpu ARM1136JF-S implies the option
If a VFP coprocessor is present, VFP instructions are generated.
If there is no VFP coprocessor, the compiler generates code that
makes calls to the software floating-point library fplib to
carry out floating-point operations. fplib is
available as part of the standard distribution of the ARM compilation
tools suite of C libraries.