[Bug target/67642] New: [SH] FPSCR not saved,loaded,restored for ISRs and single-precision-only FPU

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67642

            Bug ID: 67642
           Summary: [SH] FPSCR not saved,loaded,restored for ISRs and
                    single-precision-only FPU
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: olegendo at gcc dot gnu.org
  Target Milestone: ---
            Target: sh*-*-*

If the FPU is (potentially) used in ISRs, it should be brought into a
consistent state and should not modify the interrupted context's FPSCR state,
even if there is only a single-precision FPU (or the FPU is used as
single-precision-only) and FPU mode-switching is not done.

The test case gcc.target/sh/pragma-isr-trapa2.c fail when ran with -m2e, -m3e,
-m2a-single-only, -m4-single-only, -m4a-single-only

The other ISR related test cases seem to miss the check.