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This patch comes from https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81803

Author: mpf <mpf@138bc75d-0d04-0410-961f-82ee72b054a4>

This patch hasn't been merged into gcc. But it does solve the problem of
strange behaviour of `systemd status <xxx>' on qemumips64.

Upstream-Status: Pending [Taken from gcc bugzilla's attachment]

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 gcc/lra-constraints.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c
index c8bc9b9a66f..6d319662b09 100644
--- a/gcc/lra-constraints.c
+++ b/gcc/lra-constraints.c
@@ -4235,7 +4235,12 @@ curr_insn_transform (bool check_only_p)
 			  && (goal_alt[i] == NO_REGS
 			      || (simplify_subreg_regno
 				  (ira_class_hard_regs[goal_alt[i]][0],
-				   GET_MODE (reg), byte, mode) >= 0)))))
+				   GET_MODE (reg), byte, mode) >= 0))))
+		      || (type != OP_IN
+			  && GET_MODE_PRECISION (mode)
+			  < GET_MODE_PRECISION (GET_MODE (reg))
+			  && GET_MODE_SIZE (GET_MODE (reg)) <= UNITS_PER_WORD
+			  && WORD_REGISTER_OPERATIONS))
 		{
 		  /* An OP_INOUT is required when reloading a subreg of a
 		     mode wider than a word to ensure that data beyond the
-- 
2.13.0