port-sh3/60773: sh3 __sync_val_compare_and_swap_1 test failures

["martin%NetBSD.org@localhost via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         60773
>Category:       port-sh3
>Synopsis:       sh3 __sync_val_compare_and_swap_1 test failures
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-sh3-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 23 13:45:00 +0000 2026
>Originator:     Martin Husemann
>Release:        NetBSD 11.99.8
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD last-of-the-heroes.duskware.de 11.99.8 NetBSD 11.99.8 (GENERIC) #412: Tue Sep 22 09:43:24 CEST 2026 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/landisk/compile/GENERIC landisk
Architecture: sh3el
Machine: landisk
>Description:

Some CAS test cases go wrong on the landisk tests
https://www.NetBSD.org/~martin/landisk-atf

>How-To-Repeat:

cd /usr/tests/lib/libc/atomic && ./t___sync_compare_and_swap __sync_val_compare_and_swap_1

note:

failed: /work/src/tests/lib/libc/atomic/t___sync_compare_and_swap.c:189: successful case: res expects 0x88 but 0xffffff88

>Fix:
n/a