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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
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