alias.c (find_base_value): Only use new_reg_base_value shortcut if the register is set once.

        * alias.c (find_base_value): Only use new_reg_base_value shortcut
        if the register is set once.

From-SVN: r61017

gcc/ChangeLog

+2003-01-07  Richard Henderson  <rth@redhat.com>
+
+        * alias.c (find_base_value): Only use new_reg_base_value shortcut
+        if the register is set once.
+
 2003-01-07  Sylvain Pion <Sylvain.Pion@mpi-sb.mpg.de>
   
 	* config/i386/i386.c (ix86_init_mmx_sse_builtins):

gcc/alias.c

 /* Alias analysis for GNU C
-   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
+   Free Software Foundation, Inc.
    Contributed by John Carr (jfc@mit.edu).
 
 This file is part of GCC.
@@ -787,7 +788,8 @@ find_base_value (src)
 	{
 	  /* If we're inside init_alias_analysis, use new_reg_base_value
 	     to reduce the number of relaxation iterations.  */
-	  if (new_reg_base_value && new_reg_base_value[regno])
+	  if (new_reg_base_value && new_reg_base_value[regno]
+	      && REG_N_SETS (regno) == 1)
 	    return new_reg_base_value[regno];
 
 	  if (reg_base_value[regno])