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The default of choosing the fixed-point implementation if the target hardware does not have floating-point unit is not always the best choice. Modern ARM hardware has floating point support but most likely the fixed-point implementation in Opus will still perform better. In particular if your CPU supports the NEON extension. This commit allows to select the fixed-point implementation manually and sets the default based on the availability of a floating-point unit. [Peter: force option for sw float, slightly reword] Signed-off-by: Sven Neumann <neumann@teufel.de> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>