https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80083
--- Comment #3 from acsawdey at gcc dot gnu.org ---
After discussion with Meissner and others, this appears to be the fix for
movsi_internal1 that is needed:
Index: gcc/config/rs6000/rs6000.md
===================================================================
--- gcc/config/rs6000/rs6000.md (revision 246136)
+++ gcc/config/rs6000/rs6000.md (working copy)
@@ -6727,7 +6727,7 @@
[(set (match_operand:SI 0 "rs6000_nonimmediate_operand"
"=r, r, r, ?*wI, ?*wH,
m, ?Z, ?Z, r, r,
- r, ?*wIwH, ?*wJwK, ?*wK, ?*wJwK,
+ r, ?*wIwH, ?*wJwK, ?*wJwK, ?*wu,
?*wJwK, ?*wH, ?*wK, ?*wIwH, ?r,
r, *c*l, *h, *h")
