try_split returns an rtx_insn

2014-08-21  David Malcolm  <dmalcolm@redhat.com>

	* rtl.h (try_split): Strengthen return type from rtx to rtx_insn *.

	* emit-rtl.c (try_split): Likewise, also for locals "before" and
	"after".  For now, don't strengthen param "trial", which requires
	adding checked casts when returning it.

From-SVN: r214260

gcc/ChangeLog

 2014-08-21  David Malcolm  <dmalcolm@redhat.com>
 
+	* rtl.h (try_split): Strengthen return type from rtx to rtx_insn *.
+
+	* emit-rtl.c (try_split): Likewise, also for locals "before" and
+	"after".  For now, don't strengthen param "trial", which requires
+	adding checked casts when returning it.
+
+2014-08-21  David Malcolm  <dmalcolm@redhat.com>
+
 	* debug.h (struct gcc_debug_hooks): Strengthen param 1 of hook
 	"label" from rtx to rtx_code_label *.  Strengthen param 1 of
 	"var_location" hook from rtx to rtx_insn *.

gcc/emit-rtl.c

@@ -3551,11 +3551,11 @@ mark_label_nuses (rtx x)
    replacement insn depending on the value of LAST.  Otherwise, it
    returns TRIAL.  If the insn to be returned can be split, it will be.  */
 
-rtx
+rtx_insn *
 try_split (rtx pat, rtx trial, int last)
 {
-  rtx before = PREV_INSN (trial);
-  rtx after = NEXT_INSN (trial);
+  rtx_insn *before = PREV_INSN (trial);
+  rtx_insn *after = NEXT_INSN (trial);
   int has_barrier = 0;
   rtx note, seq, tem;
   int probability;
@@ -3565,7 +3565,7 @@ try_split (rtx pat, rtx trial, int last)
 
   /* We're not good at redistributing frame information.  */
   if (RTX_FRAME_RELATED_P (trial))
-    return trial;
+    return as_a <rtx_insn *> (trial);
 
   if (any_condjump_p (trial)
       && (note = find_reg_note (trial, REG_BR_PROB, 0)))
@@ -3585,7 +3585,7 @@ try_split (rtx pat, rtx trial, int last)
     }
 
   if (!seq)
-    return trial;
+    return as_a <rtx_insn *> (trial);
 
   /* Avoid infinite loop if any insn of the result matches
      the original pattern.  */
@@ -3594,7 +3594,7 @@ try_split (rtx pat, rtx trial, int last)
     {
       if (INSN_P (insn_last)
 	  && rtx_equal_p (PATTERN (insn_last), pat))
-	return trial;
+	return as_a <rtx_insn *> (trial);
       if (!NEXT_INSN (insn_last))
 	break;
       insn_last = NEXT_INSN (insn_last);

gcc/rtl.h

@@ -2465,7 +2465,7 @@ extern rtx delete_related_insns (rtx);
 extern rtx *find_constant_term_loc (rtx *);
 
 /* In emit-rtl.c  */
-extern rtx try_split (rtx, rtx, int);
+extern rtx_insn *try_split (rtx, rtx, int);
 extern int split_branch_probability;
 
 /* In unknown file  */