https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120587
Stafford Horne <shorne at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |or1k
Last reconfirmed| |2025-06-08
Status|UNCONFIRMED |ASSIGNED
Ever confirmed|0 |1
--- Comment #1 from Stafford Horne <shorne at gcc dot gnu.org> ---
Discussed on the mailing list.
https://gcc.gnu.org/pipermail/gcc-patches/2025-June/685962.html
In summary validate_subregs was modified in the patch:
2025-05-18 eb2ea476db2 Dimitar Dimitrov emit-rtl: Allow extra checks for
paradoxical subregs [PR119966]
After this the oepnrisc port no longer generates subregs when converting
special register SR_F from BI to SI.
A patch in the works is:
--- a/gcc/config/or1k/or1k.cc
+++ b/gcc/config/or1k/or1k.cc
@@ -1408,8 +1408,9 @@ static bool
or1k_can_change_mode_class (machine_mode from, machine_mode to,
reg_class_t rclass)
{
+ /* Allow cnoverting special flags to SI mode subregs. */
if (rclass == FLAG_REGS)
- return from == to;
+ return from == to || (from == BImode && to == SImode);
return true;
}
