[Question] Why should we check irq_fpu_usable before accessing using ASENI instructions.

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Hello,
 I am new to assembly language programming.
 In Kernel we check irq_fpu_usable before using any of AESNI related
instruction.
 1) why should we check the FPU is available for using AESNI instructions ?
 2) Will AESNI intructions make use of FPU ?

I tried searching the answer in internet, no where i found the answer.
Could please come one answer in this list.

Guru
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