re PR target/61544 (ICE due to thumb1_reorg function mishandles label type insn)

2014-06-18  Terry Guo  <terry.guo@arm.com>

	PR target/61544
	* config/arm/arm.c (thumb1_reorg): Move to next basic block if we
	reach the head.

From-SVN: r211775

gcc/ChangeLog

+2014-06-18  Terry Guo  <terry.guo@arm.com>
+
+	PR target/61544
+	* config/arm/arm.c (thumb1_reorg): Move to next basic block if we
+	reach the head.
+
 2014-06-18  Richard Biener  <rguenther@suse.de>
 
 	* common.opt (fssa-phiopt): New option.

gcc/config/arm/arm.c

@@ -16946,7 +16946,8 @@ thumb1_reorg (void)
 	insn = PREV_INSN (insn);
 
       /* Find the last cbranchsi4_insn in basic block BB.  */
-      if (INSN_CODE (insn) != CODE_FOR_cbranchsi4_insn)
+      if (insn == BB_HEAD (bb)
+	  || INSN_CODE (insn) != CODE_FOR_cbranchsi4_insn)
 	continue;
 
       /* Get the register with which we are comparing.  */