function.c (instantiate_virtual_regs_in_insn): Copy to new reg before forcing mode.

2009-11-30  Steve Ellcey  <sje@cup.hp.com>
	    Jakub Jelinek <jakub@redhat.com>

	* function.c (instantiate_virtual_regs_in_insn): Copy to new reg
	before forcing mode.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r154843

gcc/ChangeLog

+2009-11-30  Steve Ellcey  <sje@cup.hp.com>
+	    Jakub Jelinek <jakub@redhat.com>
+
+	* function.c (instantiate_virtual_regs_in_insn): Copy to new reg
+	before forcing mode.
+
 2009-11-30  Anatoly Sokolov  <aesok@post.ru>
 
 	* config/sh/sh.c (sh_promote_prototypes): Make static.

gcc/function.c

@@ -1598,7 +1598,13 @@ instantiate_virtual_regs_in_insn (rtx insn)
       if (!safe_insn_predicate (insn_code, i, x))
 	{
 	  start_sequence ();
-	  x = force_reg (insn_data[insn_code].operand[i].mode, x);
+	  if (REG_P (x))
+	    {
+	      gcc_assert (REGNO (x) <= LAST_VIRTUAL_REGISTER);
+	      x = copy_to_reg (x);
+	    }
+	  else
+	    x = force_reg (insn_data[insn_code].operand[i].mode, x);
 	  seq = get_insns ();
 	  end_sequence ();
 	  if (seq)