SIS | Improve fidelity of SPARC FPU emulation (!11)

[Jiri Gaisler (@jirigaisler)]

Jiri Gaisler created a merge request: https://gitlab.rtems.org/rtems/tools/rtems-sis/-/merge_requests/11

Project:Branches: jirigaisler/rtems-sis:fpufidelity to rtems/tools/rtems-sis:main
Author: Jiri Gaisler

## Summary

Improve fidelity of SPARC FPU emulation

* FCMPS/FCMPD should only raise NV exception on signaling NaN

* FDTOI/FSTOI should return 0x7FFFFFFF on positive overflow


## Generative AI

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View it on GitLab: https://gitlab.rtems.org/rtems/tools/rtems-sis/-/merge_requests/11
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