Strengthen fields in struct sequence_stack and struct emit_status

gcc/
2014-08-26  David Malcolm  <dmalcolm@redhat.com>

	* function.h (struct sequence_stack): Strengthen fields "first"
	and "last" from rtx to rtx_insn *.
	(struct emit_status): Likewise for fields "x_first_insn" and
	"x_last_insn".

	* emit-rtl.h (get_insns): Remove now-redundant checked cast.
	(set_first_insn): Add checked cast.
	(get_last_insn): Remove now-redundant checked cast.
	(set_last_insn): Add checked cast.

	* config/m32c/m32c.c (m32c_leaf_function_p): Strengthen locals
	"saved_first" and "saved_last" from rtx to rtx_insn *.

From-SVN: r214537

gcc/ChangeLog

 2014-08-26  David Malcolm  <dmalcolm@redhat.com>
 
+	* function.h (struct sequence_stack): Strengthen fields "first"
+	and "last" from rtx to rtx_insn *.
+	(struct emit_status): Likewise for fields "x_first_insn" and
+	"x_last_insn".
+
+	* emit-rtl.h (get_insns): Remove now-redundant checked cast.
+	(set_first_insn): Add checked cast.
+	(get_last_insn): Remove now-redundant checked cast.
+	(set_last_insn): Add checked cast.
+
+	* config/m32c/m32c.c (m32c_leaf_function_p): Strengthen locals
+	"saved_first" and "saved_last" from rtx to rtx_insn *.
+
+2014-08-26  David Malcolm  <dmalcolm@redhat.com>
+
 	* rtl.h (add_insn): Strengthen param from rtx to rtx_insn *.
 	(unlink_insn_chain): Strengthen both params from rtx to
 	rtx_insn *.

gcc/config/m32c/m32c.c

@@ -4045,7 +4045,7 @@ m32c_encode_section_info (tree decl, rtx rtl, int first)
 static int
 m32c_leaf_function_p (void)
 {
-  rtx saved_first, saved_last;
+  rtx_insn *saved_first, *saved_last;
   struct sequence_stack *seq;
   int rv;
 

gcc/emit-rtl.h

@@ -80,8 +80,7 @@ extern bool need_atomic_barrier_p (enum memmodel, bool);
 static inline rtx_insn *
 get_insns (void)
 {
-  rtx insn = crtl->emit.x_first_insn;
-  return safe_as_a <rtx_insn *> (insn);
+  return crtl->emit.x_first_insn;
 }
 
 /* Specify a new insn as the first in the chain.  */
@@ -90,7 +89,7 @@ static inline void
 set_first_insn (rtx insn)
 {
   gcc_checking_assert (!insn || !PREV_INSN (insn));
-  crtl->emit.x_first_insn = insn;
+  crtl->emit.x_first_insn = safe_as_a <rtx_insn *> (insn);
 }
 
 /* Return the last insn emitted in current sequence or current function.  */
@@ -98,8 +97,7 @@ set_first_insn (rtx insn)
 static inline rtx_insn *
 get_last_insn (void)
 {
-  rtx insn = crtl->emit.x_last_insn;
-  return safe_as_a <rtx_insn *> (insn);
+  return crtl->emit.x_last_insn;
 }
 
 /* Specify a new insn as the last in the chain.  */
@@ -108,7 +106,7 @@ static inline void
 set_last_insn (rtx insn)
 {
   gcc_checking_assert (!insn || !NEXT_INSN (insn));
-  crtl->emit.x_last_insn = insn;
+  crtl->emit.x_last_insn = safe_as_a <rtx_insn *> (insn);
 }
 
 /* Return a number larger than any instruction's uid in this function.  */

gcc/function.h

@@ -34,8 +34,8 @@ along with GCC; see the file COPYING3.  If not see
 
 struct GTY(()) sequence_stack {
   /* First and last insns in the chain of the saved sequence.  */
-  rtx first;
-  rtx last;
+  rtx_insn *first;
+  rtx_insn *last;
   struct sequence_stack *next;
 };
 
@@ -52,8 +52,8 @@ struct GTY(()) emit_status {
 
      start_sequence saves both of these on `sequence_stack' and then starts
      a new, nested sequence of insns.  */
-  rtx x_first_insn;
-  rtx x_last_insn;
+  rtx_insn *x_first_insn;
+  rtx_insn *x_last_insn;
 
   /* Stack of pending (incomplete) sequences saved by `start_sequence'.
      Each element describes one pending sequence.