(eliminate_regs_in_insn): Make another copy of all the RTL if we

changed something and we aren't permanently replacing.

From-SVN: r2845

diff --git a/gcc/reload1.c b/gcc/reload1.c
index 7ffef0d9481ee5be78cdc1166690b122b11dacd4..7458018b81cf996c991382a2900e2186e94778bd 100644 (file)
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -2996,6 +2996,14 @@ eliminate_regs_in_insn (insn, replace)
   new_body = eliminate_regs (old_body, 0, replace ? insn : NULL_RTX);
   if (new_body != old_body)
     {
+      /* If we aren't replacing things permanently and we changed something,
+        make another copy to ensure that all the RTL is new.  Otherwise
+        things can go wrong if find_reload swaps commutative operands
+        and one is inside RTL that has been copied while the other is not. */
+
+      if (! replace)
+       new_body = copy_rtx (new_body);
+
       /* If we had a move insn but now we don't, rerecognize it.  */
       if ((GET_CODE (old_body) == SET && GET_CODE (SET_SRC (old_body)) == REG
           && (GET_CODE (new_body) != SET