re PR rtl-optimization/49900 (ICE in advance_target_bb, at sched-ebb.c:691)

	PR rtl-optimization/49900
	* sched-ebb.c (add_deps_for_risky_insns): Also add dependencies to
	ensure basic blocks stay in the same order.

From-SVN: r177475

gcc/ChangeLog

+2011-08-05  Bernd Schmidt  <bernds@codesourcery.com>
+
+	PR rtl-optimization/49900
+	* sched-ebb.c (add_deps_for_risky_insns): Also add dependencies to
+	ensure basic blocks stay in the same order.
+
 2011-08-05  Aldy Hernandez  <aldyh@redhat.com>
 
 	* config/s390/s390.c (s390_expand_cs_hqi): Add new arguments to

gcc/sched-ebb.c

@@ -397,6 +397,9 @@ add_deps_for_risky_insns (rtx head, rtx tail)
 	  bb = BLOCK_FOR_INSN (insn);
 	  bb->aux = last_block;
 	  last_block = bb;
+	  /* Ensure blocks stay in the same order.  */
+	  if (last_jump)
+	    add_dependence (insn, last_jump, REG_DEP_ANTI);
 	  last_jump = insn;
 	}
       else if (INSN_P (insn) && last_jump != NULL_RTX)