spu.c (get_pic_reg): Use LAST_ARG_REGNUM as PIC registers in leaf functions if possible.

	* config/spu/spu.c (get_pic_reg): Use LAST_ARG_REGNUM as PIC
	registers in leaf functions if possible.

From-SVN: r154245

gcc/ChangeLog

+2009-11-17  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
+
+	* config/spu/spu.c (get_pic_reg): Use LAST_ARG_REGNUM as PIC
+	registers in leaf functions if possible.
+
 2009-11-17  Maxim Kuvyrkov  <maxim@codesourcery.com>
 
 	* config/m68k/m68k-devices.def: Add MCF5441x family.

gcc/config/spu/spu.c

@@ -1710,6 +1710,8 @@ get_pic_reg (void)
   rtx pic_reg = pic_offset_table_rtx;
   if (!reload_completed && !reload_in_progress)
     abort ();
+  if (current_function_is_leaf && !df_regs_ever_live_p (LAST_ARG_REGNUM))
+    pic_reg = gen_rtx_REG (SImode, LAST_ARG_REGNUM);
   return pic_reg;
 }