6.6.8.10.2 FP Exception Sticky Flags

The INVAL, DIV0, OVF, UDF, INX, HUGI and SUBO exception flags have corresponding “sticky” flags INVALS, DIV0S, OVFS, UDFS, INXS, HUGIS and SUBOS also located within the FSR. These bits are set whenever the corresponding exception flag is set. They will remain set if the exception flag is cleared by a subsequent instruction; therefore, they are considered “sticky.” These bits support the delayed exception handling model required by the IEEE 754-2008 standard and are analogous to conventional interrupt flags.