diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 073b53ee843..1feb9368121 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-01-17  Kaz Kojima  <kkojima@gcc.gnu.org>
+
+	PR target/78633
+	* config/sh/sh.md (cmpeqsi_t+1): Call copy_rtx to avoid invalid
+	RTL sharing.
+
 2017-01-17  Alan Modra  <amodra@gmail.com>
 
 	PR target/79066
diff --git a/gcc/config/sh/sh.md b/gcc/config/sh/sh.md
index 11576f48437..2645fca4738 100644
--- a/gcc/config/sh/sh.md
+++ b/gcc/config/sh/sh.md
@@ -858,7 +858,8 @@
 	 operands of the tstsi_t insn, which is generally the case.  */
       if (dump_file)
 	fprintf (dump_file, "cmpeqsi_t: replacing with tstsi_t\n");
-      emit_insn (gen_tstsi_t (XEXP (op.set_src, 0), XEXP (op.set_src, 1)));
+      emit_insn (gen_tstsi_t (copy_rtx (XEXP (op.set_src, 0)),
+			      copy_rtx (XEXP (op.set_src, 1))));
       DONE;
     }