This patch converts various rtx to rtx_insn * (or rtx_code_label *).
It also convert the various "_loc" params from int to location_t

gcc/ChangeLog:
        * emit-rtl.c (next_real_insn): Strengthen param from "rtx"
        to "rtx_insn *".
        (add_insn_after): Likewise for first two params.
        (add_insn_before): Likewise.
        (remove_insn): Likewise for param.
        (emit_pattern_before_noloc): Likewise for second and third params.
        (emit_jump_insn_before_noloc): Convert NULL_RTX to NULL.
        (emit_call_insn_before_noloc): Likewise.
        (emit_debug_insn_before_noloc): Strengthen "before" param from "rtx"
        to "rtx_insn *".
        (emit_barrier_before): Likewise.
        (emit_label_before): Strengthen "label" param from "rtx" to
        "rtx_code_label *".  Strengthen "before" param from "rtx" to
        "rtx_insn *".
        (emit_insn_after_1): Strengthen "after" param from "rtx" to
        "rtx_insn *".
        (emit_pattern_after_noloc): Likewise.
        (emit_insn_after_noloc): Likewise.
        (emit_jump_insn_after_noloc): Likewise.
        (emit_call_insn_after_noloc): Likewise.
        (emit_debug_insn_after_noloc): Likewise.
        (emit_barrier_after): Likewise.
        (emit_label_after): Likewise for both params.
        (emit_pattern_after_setloc): Likewise for "after" param.  Convert
        "loc" param from "int" to "location_t".
        (emit_insn_after_setloc): Likewise.
        (emit_jump_insn_after_setloc): Likewise.
        (emit_call_insn_after_setloc): Likewise.
        (emit_debug_insn_after_setloc): Likewise.
        (emit_pattern_before_setloc): Likewise for "before" param.  Convert
        "loc" param from "int" to "location_t".
        (emit_pattern_before): Convert NULL_RTX to NULL.
        (emit_insn_before_setloc): Convert "loc" param from "int" to
        "location_t".
        (emit_jump_insn_before_setloc): Likewise.
        (emit_call_insn_before_setloc): Likewise.
        (emit_debug_insn_before_setloc): Strengthen "before" param from rtx to
        rtx_insn *.  Convert "loc" param from "int" to "location_t".
        * rtl.h (emit_insn_before_setloc, emit_jump_insn_before_setloc,
        emit_call_insn_before_setloc, emit_debug_insn_before_setloc):
        Convert 3rd param from "int" to "location_t".
        (emit_barrier_before, emit_barrier_after, next_real_insn):
        Strengthen param from rtx to rtx_insn *.
        (emit_label_before): Strengthen 1st param from "rtx" to
        "rtx_code_label *".  Strengthen 2nd param from "rtx" to
        "rtx_insn *".
        (emit_insn_after_noloc, emit_jump_insn_after_noloc,
        emit_call_insn_after_noloc, emit_debug_insn_after_noloc):
        Strengthen 2nd param from "rtx" to "rtx_insn *".
        (emit_insn_after_setloc, emit_jump_insn_after_setloc)
        emit_call_insn_after_setloc, emit_debug_insn_after_setloc):
        Likewise. Convert 3rd param from "int" to "location_t".
        (emit_label_after): Strengthen 1st param from "rtx" to
        "rtx_code_label *".
        (next_real_insn, remove_insn): Strengthen param from "rtx" to
        "rtx_insn *".
        (add_insn_before, add_insn_after): Strengthen 1st and 2nd params
        from "rtx" to "rtx_insn *".
---
 gcc/emit-rtl.c | 84 ++++++++++++++++++++++++++--------------------------------
 gcc/rtl.h      | 41 ++++++++++++++--------------
 2 files changed, 58 insertions(+), 67 deletions(-)

diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index 613030f..a327ff2 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -3602,10 +3602,8 @@ prev_nonnote_nondebug_insn_bb (rtx_insn *insn)
    SEQUENCEs.  */
 
 rtx_insn *
-next_real_insn (rtx uncast_insn)
+next_real_insn (rtx_insn *insn)
 {
-  rtx_insn *insn = safe_as_a <rtx_insn *> (uncast_insn);
-
   while (insn)
     {
       insn = NEXT_INSN (insn);
@@ -4230,10 +4228,8 @@ add_insn_before_nobb (rtx_insn *insn, rtx_insn *before)
    they know how to update a SEQUENCE. */
 
 void
-add_insn_after (rtx uncast_insn, rtx uncast_after, basic_block bb)
+add_insn_after (rtx_insn *insn, rtx_insn *after, basic_block bb)
 {
-  rtx_insn *insn = as_a <rtx_insn *> (uncast_insn);
-  rtx_insn *after = as_a <rtx_insn *> (uncast_after);
   add_insn_after_nobb (insn, after);
   if (!BARRIER_P (after)
       && !BARRIER_P (insn)
@@ -4260,10 +4256,8 @@ add_insn_after (rtx uncast_insn, rtx uncast_after, 
basic_block bb)
    they know how to update a SEQUENCE. */
 
 void
-add_insn_before (rtx uncast_insn, rtx uncast_before, basic_block bb)
+add_insn_before (rtx_insn *insn, rtx_insn *before, basic_block bb)
 {
-  rtx_insn *insn = as_a <rtx_insn *> (uncast_insn);
-  rtx_insn *before = as_a <rtx_insn *> (uncast_before);
   add_insn_before_nobb (insn, before);
 
   if (!bb
@@ -4313,9 +4307,8 @@ set_insn_deleted (rtx insn)
    To really delete an insn and related DF information, use delete_insn.  */
 
 void
-remove_insn (rtx uncast_insn)
+remove_insn (rtx_insn *insn)
 {
-  rtx_insn *insn = as_a <rtx_insn *> (uncast_insn);
   rtx_insn *next = NEXT_INSN (insn);
   rtx_insn *prev = PREV_INSN (insn);
   basic_block bb;
@@ -4518,7 +4511,8 @@ reorder_insns (rtx_insn *from, rtx_insn *to, rtx_insn 
*after)
    generated would almost certainly die right after it was created.  */
 
 static rtx_insn *
-emit_pattern_before_noloc (rtx x, rtx before, rtx last, basic_block bb,
+emit_pattern_before_noloc (rtx x, rtx_insn *before, rtx_insn *last,
+                          basic_block bb,
                            rtx_insn *(*make_raw) (rtx))
 {
   rtx_insn *insn;
@@ -4526,7 +4520,7 @@ emit_pattern_before_noloc (rtx x, rtx before, rtx last, 
basic_block bb,
   gcc_assert (before);
 
   if (x == NULL_RTX)
-    return safe_as_a <rtx_insn *> (last);
+    return last;
 
   switch (GET_CODE (x))
     {
@@ -4559,7 +4553,7 @@ emit_pattern_before_noloc (rtx x, rtx before, rtx last, 
basic_block bb,
       break;
     }
 
-  return safe_as_a <rtx_insn *> (last);
+  return last;
 }
 
 /* Make X be output before the instruction BEFORE.  */
@@ -4577,7 +4571,7 @@ rtx_jump_insn *
 emit_jump_insn_before_noloc (rtx x, rtx_insn *before)
 {
   return as_a <rtx_jump_insn *> (
-               emit_pattern_before_noloc (x, before, NULL_RTX, NULL,
+               emit_pattern_before_noloc (x, before, NULL, NULL,
                                           make_jump_insn_raw));
 }
 
@@ -4587,7 +4581,7 @@ emit_jump_insn_before_noloc (rtx x, rtx_insn *before)
 rtx_insn *
 emit_call_insn_before_noloc (rtx x, rtx_insn *before)
 {
-  return emit_pattern_before_noloc (x, before, NULL_RTX, NULL,
+  return emit_pattern_before_noloc (x, before, NULL, NULL,
                                    make_call_insn_raw);
 }
 
@@ -4595,9 +4589,9 @@ emit_call_insn_before_noloc (rtx x, rtx_insn *before)
    and output it before the instruction BEFORE.  */
 
 rtx_insn *
-emit_debug_insn_before_noloc (rtx x, rtx before)
+emit_debug_insn_before_noloc (rtx x, rtx_insn *before)
 {
-  return emit_pattern_before_noloc (x, before, NULL_RTX, NULL,
+  return emit_pattern_before_noloc (x, before, NULL, NULL,
                                    make_debug_insn_raw);
 }
 
@@ -4605,7 +4599,7 @@ emit_debug_insn_before_noloc (rtx x, rtx before)
    and output it before the insn BEFORE.  */
 
 rtx_barrier *
-emit_barrier_before (rtx before)
+emit_barrier_before (rtx_insn *before)
 {
   rtx_barrier *insn = as_a <rtx_barrier *> (rtx_alloc (BARRIER));
 
@@ -4618,21 +4612,20 @@ emit_barrier_before (rtx before)
 /* Emit the label LABEL before the insn BEFORE.  */
 
 rtx_code_label *
-emit_label_before (rtx label, rtx_insn *before)
+emit_label_before (rtx_code_label *label, rtx_insn *before)
 {
   gcc_checking_assert (INSN_UID (label) == 0);
   INSN_UID (label) = cur_insn_uid++;
   add_insn_before (label, before, NULL);
-  return as_a <rtx_code_label *> (label);
+  return label;
 }
 
 /* Helper for emit_insn_after, handles lists of instructions
    efficiently.  */
 
 static rtx_insn *
-emit_insn_after_1 (rtx_insn *first, rtx uncast_after, basic_block bb)
+emit_insn_after_1 (rtx_insn *first, rtx_insn *after, basic_block bb)
 {
-  rtx_insn *after = safe_as_a <rtx_insn *> (uncast_after);
   rtx_insn *last;
   rtx_insn *after_after;
   if (!bb && !BARRIER_P (after))
@@ -4674,10 +4667,9 @@ emit_insn_after_1 (rtx_insn *first, rtx uncast_after, 
basic_block bb)
 }
 
 static rtx_insn *
-emit_pattern_after_noloc (rtx x, rtx uncast_after, basic_block bb,
+emit_pattern_after_noloc (rtx x, rtx_insn *after, basic_block bb,
                          rtx_insn *(*make_raw)(rtx))
 {
-  rtx_insn *after = safe_as_a <rtx_insn *> (uncast_after);
   rtx_insn *last = after;
 
   gcc_assert (after);
@@ -4716,7 +4708,7 @@ emit_pattern_after_noloc (rtx x, rtx uncast_after, 
basic_block bb,
    BB is NULL, an attempt is made to infer the BB from AFTER.  */
 
 rtx_insn *
-emit_insn_after_noloc (rtx x, rtx after, basic_block bb)
+emit_insn_after_noloc (rtx x, rtx_insn *after, basic_block bb)
 {
   return emit_pattern_after_noloc (x, after, bb, make_insn_raw);
 }
@@ -4726,7 +4718,7 @@ emit_insn_after_noloc (rtx x, rtx after, basic_block bb)
    and output it after the insn AFTER.  */
 
 rtx_jump_insn *
-emit_jump_insn_after_noloc (rtx x, rtx after)
+emit_jump_insn_after_noloc (rtx x, rtx_insn *after)
 {
   return as_a <rtx_jump_insn *> (
                emit_pattern_after_noloc (x, after, NULL, make_jump_insn_raw));
@@ -4736,7 +4728,7 @@ emit_jump_insn_after_noloc (rtx x, rtx after)
    and output it after the instruction AFTER.  */
 
 rtx_insn *
-emit_call_insn_after_noloc (rtx x, rtx after)
+emit_call_insn_after_noloc (rtx x, rtx_insn *after)
 {
   return emit_pattern_after_noloc (x, after, NULL, make_call_insn_raw);
 }
@@ -4745,7 +4737,7 @@ emit_call_insn_after_noloc (rtx x, rtx after)
    and output it after the instruction AFTER.  */
 
 rtx_insn *
-emit_debug_insn_after_noloc (rtx x, rtx after)
+emit_debug_insn_after_noloc (rtx x, rtx_insn *after)
 {
   return emit_pattern_after_noloc (x, after, NULL, make_debug_insn_raw);
 }
@@ -4754,7 +4746,7 @@ emit_debug_insn_after_noloc (rtx x, rtx after)
    and output it after the insn AFTER.  */
 
 rtx_barrier *
-emit_barrier_after (rtx after)
+emit_barrier_after (rtx_insn *after)
 {
   rtx_barrier *insn = as_a <rtx_barrier *> (rtx_alloc (BARRIER));
 
@@ -4767,12 +4759,12 @@ emit_barrier_after (rtx after)
 /* Emit the label LABEL after the insn AFTER.  */
 
 rtx_insn *
-emit_label_after (rtx label, rtx_insn *after)
+emit_label_after (rtx_insn *label, rtx_insn *after)
 {
   gcc_checking_assert (INSN_UID (label) == 0);
   INSN_UID (label) = cur_insn_uid++;
   add_insn_after (label, after, NULL);
-  return as_a <rtx_insn *> (label);
+  return label;
 }
 
 /* Notes require a bit of special handling: Some notes need to have their
@@ -4842,10 +4834,9 @@ emit_note_before (enum insn_note subtype, rtx_insn 
*before)
    MAKE_RAW indicates how to turn PATTERN into a real insn.  */
 
 static rtx_insn *
-emit_pattern_after_setloc (rtx pattern, rtx uncast_after, int loc,
+emit_pattern_after_setloc (rtx pattern, rtx_insn *after, location_t loc,
                           rtx_insn *(*make_raw) (rtx))
 {
-  rtx_insn *after = safe_as_a <rtx_insn *> (uncast_after);
   rtx_insn *last = emit_pattern_after_noloc (pattern, after, NULL, make_raw);
 
   if (pattern == NULL_RTX || !loc)
@@ -4889,7 +4880,7 @@ emit_pattern_after (rtx pattern, rtx uncast_after, bool 
skip_debug_insns,
 
 /* Like emit_insn_after_noloc, but set INSN_LOCATION according to LOC.  */
 rtx_insn *
-emit_insn_after_setloc (rtx pattern, rtx after, int loc)
+emit_insn_after_setloc (rtx pattern, rtx_insn *after, location_t loc)
 {
   return emit_pattern_after_setloc (pattern, after, loc, make_insn_raw);
 }
@@ -4903,7 +4894,7 @@ emit_insn_after (rtx pattern, rtx after)
 
 /* Like emit_jump_insn_after_noloc, but set INSN_LOCATION according to LOC.  */
 rtx_jump_insn *
-emit_jump_insn_after_setloc (rtx pattern, rtx after, int loc)
+emit_jump_insn_after_setloc (rtx pattern, rtx_insn *after, location_t loc)
 {
   return as_a <rtx_jump_insn *> (
        emit_pattern_after_setloc (pattern, after, loc, make_jump_insn_raw));
@@ -4919,7 +4910,7 @@ emit_jump_insn_after (rtx pattern, rtx after)
 
 /* Like emit_call_insn_after_noloc, but set INSN_LOCATION according to LOC.  */
 rtx_insn *
-emit_call_insn_after_setloc (rtx pattern, rtx after, int loc)
+emit_call_insn_after_setloc (rtx pattern, rtx_insn *after, location_t loc)
 {
   return emit_pattern_after_setloc (pattern, after, loc, make_call_insn_raw);
 }
@@ -4933,7 +4924,7 @@ emit_call_insn_after (rtx pattern, rtx after)
 
 /* Like emit_debug_insn_after_noloc, but set INSN_LOCATION according to LOC.  
*/
 rtx_insn *
-emit_debug_insn_after_setloc (rtx pattern, rtx after, int loc)
+emit_debug_insn_after_setloc (rtx pattern, rtx_insn *after, location_t loc)
 {
   return emit_pattern_after_setloc (pattern, after, loc, make_debug_insn_raw);
 }
@@ -4951,13 +4942,12 @@ emit_debug_insn_after (rtx pattern, rtx after)
    CALL_INSN, etc.  */
 
 static rtx_insn *
-emit_pattern_before_setloc (rtx pattern, rtx uncast_before, int loc, bool 
insnp,
-                           rtx_insn *(*make_raw) (rtx))
+emit_pattern_before_setloc (rtx pattern, rtx_insn *before, location_t loc,
+                           bool insnp, rtx_insn *(*make_raw) (rtx))
 {
-  rtx_insn *before = as_a <rtx_insn *> (uncast_before);
   rtx_insn *first = PREV_INSN (before);
   rtx_insn *last = emit_pattern_before_noloc (pattern, before,
-                                             insnp ? before : NULL_RTX,
+                                             insnp ? before : NULL,
                                              NULL, make_raw);
 
   if (pattern == NULL_RTX || !loc)
@@ -5001,13 +4991,13 @@ emit_pattern_before (rtx pattern, rtx uncast_before, 
bool skip_debug_insns,
                                       insnp, make_raw);
   else
     return emit_pattern_before_noloc (pattern, before,
-                                     insnp ? before : NULL_RTX,
+                                     insnp ? before : NULL,
                                       NULL, make_raw);
 }
 
 /* Like emit_insn_before_noloc, but set INSN_LOCATION according to LOC.  */
 rtx_insn *
-emit_insn_before_setloc (rtx pattern, rtx_insn *before, int loc)
+emit_insn_before_setloc (rtx pattern, rtx_insn *before, location_t loc)
 {
   return emit_pattern_before_setloc (pattern, before, loc, true,
                                     make_insn_raw);
@@ -5022,7 +5012,7 @@ emit_insn_before (rtx pattern, rtx before)
 
 /* like emit_insn_before_noloc, but set INSN_LOCATION according to LOC.  */
 rtx_jump_insn *
-emit_jump_insn_before_setloc (rtx pattern, rtx_insn *before, int loc)
+emit_jump_insn_before_setloc (rtx pattern, rtx_insn *before, location_t loc)
 {
   return as_a <rtx_jump_insn *> (
        emit_pattern_before_setloc (pattern, before, loc, false,
@@ -5040,7 +5030,7 @@ emit_jump_insn_before (rtx pattern, rtx before)
 
 /* Like emit_insn_before_noloc, but set INSN_LOCATION according to LOC.  */
 rtx_insn *
-emit_call_insn_before_setloc (rtx pattern, rtx_insn *before, int loc)
+emit_call_insn_before_setloc (rtx pattern, rtx_insn *before, location_t loc)
 {
   return emit_pattern_before_setloc (pattern, before, loc, false,
                                     make_call_insn_raw);
@@ -5057,7 +5047,7 @@ emit_call_insn_before (rtx pattern, rtx_insn *before)
 
 /* Like emit_insn_before_noloc, but set INSN_LOCATION according to LOC.  */
 rtx_insn *
-emit_debug_insn_before_setloc (rtx pattern, rtx before, int loc)
+emit_debug_insn_before_setloc (rtx pattern, rtx_insn *before, location_t loc)
 {
   return emit_pattern_before_setloc (pattern, before, loc, false,
                                     make_debug_insn_raw);
diff --git a/gcc/rtl.h b/gcc/rtl.h
index 0341ba0..1870dab 100644
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -3221,33 +3221,34 @@ extern void decide_function_section (tree);
 /* In emit-rtl.c */
 extern rtx_insn *emit_insn_before (rtx, rtx);
 extern rtx_insn *emit_insn_before_noloc (rtx, rtx_insn *, basic_block);
-extern rtx_insn *emit_insn_before_setloc (rtx, rtx_insn *, int);
+extern rtx_insn *emit_insn_before_setloc (rtx, rtx_insn *, location_t);
 extern rtx_jump_insn *emit_jump_insn_before (rtx, rtx);
 extern rtx_jump_insn *emit_jump_insn_before_noloc (rtx, rtx_insn *);
-extern rtx_jump_insn *emit_jump_insn_before_setloc (rtx, rtx_insn *, int);
+extern rtx_jump_insn *emit_jump_insn_before_setloc (rtx, rtx_insn *,
+                                                   location_t);
 extern rtx_insn *emit_call_insn_before (rtx, rtx_insn *);
 extern rtx_insn *emit_call_insn_before_noloc (rtx, rtx_insn *);
-extern rtx_insn *emit_call_insn_before_setloc (rtx, rtx_insn *, int);
+extern rtx_insn *emit_call_insn_before_setloc (rtx, rtx_insn *, location_t);
 extern rtx_insn *emit_debug_insn_before (rtx, rtx_insn *);
 extern rtx_insn *emit_debug_insn_before_noloc (rtx, rtx);
-extern rtx_insn *emit_debug_insn_before_setloc (rtx, rtx, int);
-extern rtx_barrier *emit_barrier_before (rtx);
-extern rtx_code_label *emit_label_before (rtx, rtx_insn *);
+extern rtx_insn *emit_debug_insn_before_setloc (rtx, rtx_insn *, location_t);
+extern rtx_barrier *emit_barrier_before (rtx_insn *);
+extern rtx_code_label *emit_label_before (rtx_code_label *, rtx_insn *);
 extern rtx_note *emit_note_before (enum insn_note, rtx_insn *);
 extern rtx_insn *emit_insn_after (rtx, rtx);
-extern rtx_insn *emit_insn_after_noloc (rtx, rtx, basic_block);
-extern rtx_insn *emit_insn_after_setloc (rtx, rtx, int);
+extern rtx_insn *emit_insn_after_noloc (rtx, rtx_insn *, basic_block);
+extern rtx_insn *emit_insn_after_setloc (rtx, rtx_insn *, location_t);
 extern rtx_jump_insn *emit_jump_insn_after (rtx, rtx);
-extern rtx_jump_insn *emit_jump_insn_after_noloc (rtx, rtx);
-extern rtx_jump_insn *emit_jump_insn_after_setloc (rtx, rtx, int);
+extern rtx_jump_insn *emit_jump_insn_after_noloc (rtx, rtx_insn *);
+extern rtx_jump_insn *emit_jump_insn_after_setloc (rtx, rtx_insn *, 
location_t);
 extern rtx_insn *emit_call_insn_after (rtx, rtx);
-extern rtx_insn *emit_call_insn_after_noloc (rtx, rtx);
-extern rtx_insn *emit_call_insn_after_setloc (rtx, rtx, int);
+extern rtx_insn *emit_call_insn_after_noloc (rtx, rtx_insn *);
+extern rtx_insn *emit_call_insn_after_setloc (rtx, rtx_insn *, location_t);
 extern rtx_insn *emit_debug_insn_after (rtx, rtx);
-extern rtx_insn *emit_debug_insn_after_noloc (rtx, rtx);
-extern rtx_insn *emit_debug_insn_after_setloc (rtx, rtx, int);
-extern rtx_barrier *emit_barrier_after (rtx);
-extern rtx_insn *emit_label_after (rtx, rtx_insn *);
+extern rtx_insn *emit_debug_insn_after_noloc (rtx, rtx_insn *);
+extern rtx_insn *emit_debug_insn_after_setloc (rtx, rtx_insn *, location_t);
+extern rtx_barrier *emit_barrier_after (rtx_insn *);
+extern rtx_insn *emit_label_after (rtx_insn *, rtx_insn *);
 extern rtx_note *emit_note_after (enum insn_note, rtx_insn *);
 extern rtx_insn *emit_insn (rtx);
 extern rtx_insn *emit_debug_insn (rtx);
@@ -3276,7 +3277,7 @@ extern rtx_insn *prev_nonnote_nondebug_insn_bb (rtx_insn 
*);
 extern rtx_insn *next_nonnote_nondebug_insn (rtx_insn *);
 extern rtx_insn *next_nonnote_nondebug_insn_bb (rtx_insn *);
 extern rtx_insn *prev_real_insn (rtx_insn *);
-extern rtx_insn *next_real_insn (rtx);
+extern rtx_insn *next_real_insn (rtx_insn *);
 extern rtx_insn *prev_real_nondebug_insn (rtx_insn *);
 extern rtx_insn *next_real_nondebug_insn (rtx);
 extern rtx_insn *prev_active_insn (rtx_insn *);
@@ -3968,9 +3969,9 @@ extern void unshare_all_rtl_again (rtx_insn *);
 extern void unshare_all_rtl_in_chain (rtx_insn *);
 extern void verify_rtl_sharing (void);
 extern void add_insn (rtx_insn *);
-extern void add_insn_before (rtx, rtx, basic_block);
-extern void add_insn_after (rtx, rtx, basic_block);
-extern void remove_insn (rtx);
+extern void add_insn_before (rtx_insn *, rtx_insn *, basic_block);
+extern void add_insn_after (rtx_insn *, rtx_insn *, basic_block);
+extern void remove_insn (rtx_insn *);
 extern rtx_insn *emit (rtx, bool = true);
 extern void emit_insn_at_entry (rtx);
 extern rtx gen_lowpart_SUBREG (machine_mode, rtx);
-- 
1.8.5.3

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