=> R0 = context pointer (-2 for current context)
R1 = pointer to 25-word area as described under FPEmulator_SaveContext
This call allows the programmer to load a floating point context with a
specified set of register and FPSR values, destroying any pending or
incompletely processed exception in the process.
This call should almost always be preceded by one to FPEmulator_Abort: you
can create chaos in the floating point system by calling
FPEmulator_LoadContext while there is a pending or incompletely processed
exception.
This call did not work correctly until version 4.17 of the FPEmulator module.
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