[patch committed SH] Fix ICE for gcc.dg/builtin-unreachable-4.c

[Kaz Kojima]

Hi,

gcc.dg/builtin-unreachable-4.c ICEs with a segfault in sh.c:
split_branches.  It seems that that test makes an unusual
rtl sequence at the end of function which is unexpected for
split_branches.  The attached patch is to fix this problem.
It's tested with bootstrap and the top level "make -k check"
on sh4-unknown-linux-gnu.  Applied on trunk.

Regards,
	kaz
--
2009-08-27  Kaz Kojima  <kkojima@gcc.gnu.org>

	* config/sh/sh.c (split_branches): Check the result of
	next_active_insn.

--- ORIG/trunk/gcc/config/sh/sh.c	2009-08-21 13:39:30.000000000 +0900
+++ trunk/gcc/config/sh/sh.c	2009-08-27 17:57:37.000000000 +0900
@@ -5841,9 +5841,10 @@ split_branches (rtx first)
 
 	    next = next_active_insn (insn);
 
-	    if ((JUMP_P (next)
-		 || ((next = next_active_insn (next))
-		     && JUMP_P (next)))
+	    if (next
+		&& (JUMP_P (next)
+		    || ((next = next_active_insn (next))
+			&& JUMP_P (next)))
 		&& GET_CODE (PATTERN (next)) == SET
 		&& recog_memoized (next) == CODE_FOR_jump_compact
 		&& ((INSN_ADDRESSES