diff --git a/asmcomp/comballoc.ml b/asmcomp/comballoc.ml
index 13dbcaf..a22d7df 100644
--- a/asmcomp/comballoc.ml
+++ b/asmcomp/comballoc.ml
@@ -12,7 +12,7 @@
 
 (* $Id$ *)
 
-(* Combine heap allocations occurring in the same basic block *)
+(* Combine heap allocations and symbols occurring in the same basic block *)
 
 open Mach
 
@@ -27,7 +27,7 @@ let allocated_size = function
     No_alloc -> 0
   | Pending_alloc(reg, ofs) -> ofs
 
-let rec combine i allocstate =
+let rec combine i allocstate symbols =
   match i.desc with
     Iend | Ireturn | Iexit _ | Iraise ->
       (i, allocated_size allocstate)
@@ -35,17 +35,17 @@ let rec combine i allocstate =
       begin match allocstate with
         No_alloc ->
           let (newnext, newsz) =
-            combine i.next (Pending_alloc(i.res.(0), sz)) in
+            combine i.next (Pending_alloc(i.res.(0), sz)) [] in
           (instr_cons (Iop(Ialloc newsz)) i.arg i.res newnext, 0)
       | Pending_alloc(reg, ofs) ->
           if ofs + sz < Config.max_young_wosize * Arch.size_addr then begin
             let (newnext, newsz) =
-              combine i.next (Pending_alloc(reg, ofs + sz)) in
+              combine i.next (Pending_alloc(reg, ofs + sz)) symbols in
             (instr_cons (Iop(Iintop_imm(Iadd, ofs))) [| reg |] i.res newnext,
              newsz)
           end else begin
             let (newnext, newsz) =
-              combine i.next (Pending_alloc(i.res.(0), sz)) in
+              combine i.next (Pending_alloc(i.res.(0), sz)) [] in
             (instr_cons (Iop(Ialloc newsz)) i.arg i.res newnext, ofs)
           end
       end
@@ -54,8 +54,19 @@ let rec combine i allocstate =
       let newnext = combine_restart i.next in
       (instr_cons_debug i.desc i.arg i.res i.dbg newnext,
        allocated_size allocstate)
+  | Iop(Iconst_symbol s) ->
+      begin try
+        let reg = List.assoc s symbols in
+        let (newnext, sz) = combine i.next allocstate symbols in
+        (instr_cons (Iop(Imove)) [| reg |] i.res newnext, sz)
+      with
+        Not_found ->
+          let newsymbols = (s, i.res.(0)) :: symbols in
+          let (newnext, sz) = combine i.next allocstate newsymbols in
+          (instr_cons_debug i.desc i.arg i.res i.dbg newnext, sz)
+      end
   | Iop op ->
-      let (newnext, sz) = combine i.next allocstate in
+      let (newnext, sz) = combine i.next allocstate symbols in
       (instr_cons_debug i.desc i.arg i.res i.dbg newnext, sz)
   | Iifthenelse(test, ifso, ifnot) ->
       let newifso = combine_restart ifso in
@@ -73,18 +84,18 @@ let rec combine i allocstate =
       (instr_cons (Iloop(newbody)) i.arg i.res i.next,
        allocated_size allocstate)
   | Icatch(io, body, handler) ->
-      let (newbody, sz) = combine body allocstate in
+      let (newbody, sz) = combine body allocstate symbols in
       let newhandler = combine_restart handler in
       let newnext = combine_restart i.next in
       (instr_cons (Icatch(io, newbody, newhandler)) i.arg i.res newnext, sz)
   | Itrywith(body, handler) ->
-      let (newbody, sz) = combine body allocstate in
+      let (newbody, sz) = combine body allocstate symbols in
       let newhandler = combine_restart handler in
       let newnext = combine_restart i.next in
       (instr_cons (Itrywith(newbody, newhandler)) i.arg i.res newnext, sz)
 
 and combine_restart i =
-  let (newi, _) = combine i No_alloc in newi
+  let (newi, _) = combine i No_alloc [] in newi
 
 let fundecl f =
   {f with fun_body = combine_restart f.fun_body}
diff --git a/asmcomp/comballoc.mli b/asmcomp/comballoc.mli
index 329e927..77ffcf6 100644
--- a/asmcomp/comballoc.mli
+++ b/asmcomp/comballoc.mli
@@ -12,6 +12,6 @@
 
 (* $Id$ *)
 
-(* Combine heap allocations occurring in the same basic block *)
+(* Combine heap allocations and symbols occurring in the same basic block *)
 
 val fundecl: Mach.fundecl -> Mach.fundecl