SIS | sparc: corrected fcmps/d and fxtoi instructions (!12)

[Jiri Gaisler (@jirigaisler)]

Jiri Gaisler created a merge request: https://gitlab.rtems.org/rtems/tools/rtems-sis/-/merge_requests/12

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

## Summary

sparc: corrected fcmps/d and fxtoi instructions

* 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/12
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