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PRIS and BFHFNMINS in AIRCR

Hsuan

Hi,

I recently studied Arm®v8-M Architecture Reference Manual and saw the description "The effect of setting both BFHFNMINS and PRIS to 1 is UNPREDICTABLE." in Chapter D1.2.3 (AIRCR)

Does anyone know why it would be inappropriate to set both BFHFNMINS and PRIS to 1？

Many thanks！