See the Section 3.1 in the MPC860 User's Manual:
https://www.nxp.com/docs/en/reference-manual/MPC860UM.pdf
See the Section 1.1.4.3 in the G2 LE core Reference Manual for the MPC82xx processors:
https://www.nxp.com/docs/en/reference-manual/G2CORERM.pdf
See the Section 1.1.3.2 in the E300 core Reference Manual for the MPC83xxx processors.
See also the following page about floating point on the e500 core for the MPC85xx processors:
https://en.wikipedia.org/wiki/PowerPC_e500
Have a great day,
Pavel Chubakov
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