[lra] patch to fix listdc++ build failure on ppc64

[Vladimir Makarov]

The following patch fixes a bug introduced by a recent LRA patch.

The patch was successfully bootstrapped on x86-64 and ppc64.

2011-08-04  Vladimir Makarov <vmaka...@redhat.com>

        * lra-constraints.c (uses_hard_regs_p): Use hard register
        elimination.


Index: lra-constraints.c
===================================================================
--- lra-constraints.c   (revision 176950)
+++ lra-constraints.c   (working copy)
@@ -1249,7 +1303,7 @@ get_final_hard_regno (int hard_regno, in
 static bool
 uses_hard_regs_p (rtx *loc, HARD_REG_SET set)
 {
-  int i, j, x_hard_regno;
+  int i, j, x_hard_regno, offset;
   enum machine_mode mode;
   rtx x;
   const char *fmt;
@@ -1271,9 +1325,10 @@ uses_hard_regs_p (rtx *loc, HARD_REG_SET
   
   if (REG_P (x))
     {
-      x_hard_regno = REGNO (x);
-      if (x_hard_regno >= FIRST_PSEUDO_REGISTER)
-       x_hard_regno = reg_renumber[x_hard_regno];
+      lra_get_hard_regno_and_offset (x, &x_hard_regno, &offset);
+      /* The real hard regno of the operand after the allocation.  It
+        can be negative only for registers.  */
+      x_hard_regno = get_final_hard_regno (x_hard_regno, offset);
       return (x_hard_regno >= 0
              && lra_hard_reg_set_intersection_p (x_hard_regno, mode, set));
     }