Should not sink instructions which may cause trap

2014-09-30  Jiong Wang  <jiong.wang@arm.com>

  gcc/
    * shrink-wrap.c (move_insn_for_shrink_wrap): Check "can_throw_internal"
    before sinking insn.

From-SVN: r215709

gcc/ChangeLog

+2014-09-30  Jiong Wang  <jiong.wang@arm.com>
+
+	* shrink-wrap.c (move_insn_for_shrink_wrap): Check "can_throw_internal"
+	before sinking insn.
+
 2014-09-30  David Sherwood  <david.sherwood@arm.com>
 
 	* ira-int.h (ira_allocno): Add "wmode" field.

gcc/shrink-wrap.c

@@ -189,6 +189,9 @@ move_insn_for_shrink_wrap (basic_block bb, rtx_insn *insn,
       unsigned int nonconstobj_num = 0;
       rtx src_inner = NULL_RTX;
 
+      if (can_throw_internal (insn))
+	return false;
+
       subrtx_var_iterator::array_type array;
       FOR_EACH_SUBRTX_VAR (iter, array, src, ALL)
 	{