[PATCH] Handel REG_LIBCALL note after split

[Sa Liu <SALIU@de.ibm.com>]

This patch relink the insns with REG_LIBCALL note and with REG_RETVAL note 
after split.
The discussion in GCC mailing list can be found here:
http://gcc.gnu.org/ml/gcc/2007-07/msg00925.html

The patch has been tested on spu with gcc test suits and got no 
regression.

Is it now OK for the mainline?

Thanks,
Sa

Index: gcc/emit-rtl.c
===================================================================
--- gcc.orig/emit-rtl.c
+++ gcc/emit-rtl.c
@@ -3129,7 +3129,7 @@ try_split (rtx pat, rtx trial, int last)
   rtx before = PREV_INSN (trial);
   rtx after = NEXT_INSN (trial);
   int has_barrier = 0;
-  rtx tem;
+  rtx tem, note_retval;
   rtx note, seq;
   int probability;
   rtx insn_last, insn;
@@ -3264,6 +3264,16 @@ try_split (rtx pat, rtx trial, int last)
            }
          break;
 #endif
+       case REG_LIBCALL:
+       /* Relink the insns with REG_LIBCALL note and with REG_RETVAL note 

+          after split.  */
+           REG_NOTES (insn_last) 
+               = gen_rtx_EXPR_LIST (REG_LIBCALL,
+                                    XEXP (note, 0),
+                                    REG_NOTES (insn_last)); 
+           note_retval = find_reg_note (XEXP (note, 0), REG_RETVAL, 
NULL);
+           XEXP (note_retval, 0) = insn_last;
+         break;
 
        default:
          break;