@@ -4186,6 +4186,10 @@ try_combine (rtx_insn *i3, rtx_insn *i2, rtx_insn *i1, rtx_insn *i0,
adjust_for_new_dest (i3);
}
+ bool i2_unchanged = false;
+ if (rtx_equal_p (newi2pat, PATTERN (i2)))
+ i2_unchanged = true;
+
/* We now know that we can do this combination. Merge the insns and
update the status of registers and LOG_LINKS. */
@@ -4752,6 +4756,9 @@ try_combine (rtx_insn *i3, rtx_insn *i2, rtx_insn *i1, rtx_insn *i0,
combine_successes++;
undo_commit ();
+ if (i2_unchanged)
+ return i3;
+
rtx_insn *ret = newi2pat ? i2 : i3;
if (added_links_insn && DF_INSN_LUID (added_links_insn) < DF_INSN_LUID (ret))
ret = added_links_insn;