1 files changed, 4 insertions, 1 deletions
diff --git a/gcc/optabs.c b/gcc/optabs.c
index c7bd9d0..65328a6 100644
--- a/gcc/optabs.c
+++ b/gcc/optabs.c
@@ -7356,7 +7356,10 @@ expand_atomic_test_and_set (rtx target, rtx mem, enum memmodel model)
      perform the operation.  */
   if (!ret)
     {
-      emit_move_insn (subtarget, mem);
+      /* If the result is ignored skip the move to target.  */
+      if (subtarget != const0_rtx)
+        emit_move_insn (subtarget, mem);
+
       emit_move_insn (mem, trueval);
       ret = subtarget;
     }