[Bug Report] `fflags.NV` is not set correctly after `fsqrt.s` instruction

rsd-devel / rsd

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

Apache License 2.0

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Closed zhangkanqi closed 4 months ago

zhangkanqi commented 4 months ago

Environment:

RSD version: bd7c5c12dfd8d20c7cb5c1d5a75f7ba59f9fce52

Bug Description:

There is an instruction fsqrt.s fa6, ft3, where ft3=0xa18d6339.

After the fsqrt.s instruction, fflags.NV flag in RSD maintains 0 . However, fflags.NV flag in spike is set to 1 .

It seems that RSD doesn't update fflags.NV correctly?

zhangkanqi commented 4 months ago

Updating of fflags isn't implemented yet.