[PATCH][RFA] PR rtl-optimization/66237

[Mikhail Maltsev]

This patch fixes a bug introduced by refactoring. A cast from rtx_insn
to rtx_jump_insn in fix_crossing_conditional_branches was placed before
the check, and that caused ICE if the instruction is actually a call,
rather than a jump.

Bootstrapped/regtested on x86_64 linux and tested the regressed case
(PR34999) on aarch64 crosscompiler using the provided profiling data.

OK for trunk?

-- 
Regards,
    Mikhail Maltsev
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gcc/ChangeLog:

2015-05-22  Mikhail Maltsev  <maltsevm@gmail.com>

	PR rtl-optimization/66237
	* bb-reorder.c (fix_crossing_conditional_branches): Fix wrong
	location of an "as_a" cast.

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diff --git a/gcc/bb-reorder.c b/gcc/bb-reorder.c
index 20e15fc..cbf6343 100644
--- a/gcc/bb-reorder.c
+++ b/gcc/bb-reorder.c
@@ -2044,7 +2044,7 @@ fix_crossing_conditional_branches (void)
 
       if (crossing_edge)
 	{
-	  rtx_jump_insn *old_jump = as_a <rtx_jump_insn *> (BB_END (cur_bb));
+	  rtx_insn *old_jump = BB_END (cur_bb);
 
 	  /* Check to make sure the jump instruction is a
 	     conditional jump.  */
@@ -2067,6 +2067,9 @@ fix_crossing_conditional_branches (void)
 
 	  if (set_src && (GET_CODE (set_src) == IF_THEN_ELSE))
 	    {
+	      rtx_jump_insn *old_jump_insn =
+			as_a <rtx_jump_insn *> (old_jump);
+
 	      if (GET_CODE (XEXP (set_src, 1)) == PC)
 		old_label = XEXP (set_src, 2);
 	      else if (GET_CODE (XEXP (set_src, 2)) == PC)
@@ -2095,7 +2098,7 @@ fix_crossing_conditional_branches (void)
 		  emit_label (new_label);
 
 		  gcc_assert (GET_CODE (old_label) == LABEL_REF);
-		  old_jump_target = old_jump->jump_target ();
+		  old_jump_target = old_jump_insn->jump_target ();
 		  new_jump = as_a <rtx_jump_insn *>
 				(emit_jump_insn (gen_jump (old_jump_target)));
 		  new_jump->set_jump_target (old_jump_target);
@@ -2114,7 +2117,7 @@ fix_crossing_conditional_branches (void)
 
 	      /* Make old jump branch to new bb.  */
 
-	      redirect_jump (old_jump, new_label, 0);
+	      redirect_jump (old_jump_insn, new_label, 0);
 
 	      /* Remove crossing_edge as predecessor of 'dest'.  */