[Bug Report] RSD didn't update fflags.NX correctly after fnmadd.s instruction

rsd-devel / rsd

RSD: RISC-V Out-of-Order Superscalar Processor

Apache License 2.0

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Closed zhangkanqi closed 1 month ago

zhangkanqi commented 1 month ago

Environment:

RSD version: bd7c5c12dfd8d20c7cb5c1d5a75f7ba59f9fce52

Bug Description:

There is a instruction fnmadd.s fs9, ft0, fs8, fa7, and ft0=0x6041bb47, fs8=0x42ad0f08, fa7=0xf86cc8d7.

After the fnmadd.s instruction, fflags maintains 0x0 in RSD. However, fflags becomes0x1 in spike.

It seems that RSD didn't update fflags.NX correctly?

zhangkanqi commented 1 month ago

Updating of fflags isn't implemented yet.