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FP in ISR

Hello, all.

I know that using float point operations in an ISR is forbidden. This now 
occurred on error - macro was called and it contained FP operation.

But now, I can not understand (cpu is MPC8260): the first FP command 
    lfd f12,0(r0)
caused machine check exception (0x200) !!
Why? what is the reason?

Thank for satisfying my curiosity...:-)
-- 
Leon