File nvl425806.patch of Package gcc43

2008-04-22  Pat Haugen  <pthaugen@us.ibm.com>

       * config/rs6000/rs6000.c (rs6000_register_move_cost): Increase cost
       of LR/CTR moves for Power6.

Index: gcc/config/rs6000/rs6000.c
===================================================================
--- gcc.orig/config/rs6000/rs6000.c	2008-09-10 17:37:30.000000000 -0300
+++ gcc/config/rs6000/rs6000.c	2008-09-10 17:37:37.000000000 -0300
@@ -21387,6 +21387,12 @@
       else if (from == CR_REGS)
 	return 4;
 
+      /* Power6 has slower LR/CTR moves so make them more expensive than
+	 memory in order to bias spills to memory .*/
+      else if (rs6000_cpu == PROCESSOR_POWER6
+	       && reg_classes_intersect_p (from, LINK_OR_CTR_REGS))
+        return 6 * hard_regno_nregs[0][mode];
+
       else
 	/* A move will cost one instruction per GPR moved.  */
 	return 2 * hard_regno_nregs[0][mode];