CONFIG_MATH_EMULATION_HW_UNIMPLEMENTED is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Just emulate the FPU unimplemented instructions

configname: CONFIG_MATH_EMULATION_HW_UNIMPLEMENTED

Math emulation options
└─>Just emulate the FPU unimplemented instructions
In linux kernel since version 3.12 (release Date: 2013-11-03)  
Select this if you know there does have a hardware FPU on your
SoC, but some floating point instructions are not implemented by that.