Merge branch 'mppa-mul' into mppa-ternary

11 files changed, 115 insertions, 106 deletions

diff --git a/mppa_k1c/Asm.v b/mppa_k1c/Asm.v
index 493f4a05..0ca554ab 100644
--- a/mppa_k1c/Asm.v
+++ b/mppa_k1c/Asm.v
@@ -50,9 +50,6 @@ Inductive instruction : Type :=
   | Psemi                                           (**r semi colon separating bundles *)

   | Pnop                                            (**r instruction that does nothing *)

 

-  | Pdiv                                            (**r 32 bits integer division *)

-  | Pdivu                                           (**r 32 bits integer division *)

-

   (** builtins *)

   | Pclzll (rd rs: ireg)

   | Pstsud (rd rs1 rs2: ireg)

@@ -218,8 +215,6 @@ Inductive instruction : Type :=
 Definition control_to_instruction (c: control) :=

   match c with

   | PExpand (Asmblock.Pbuiltin ef args res) => Pbuiltin ef args res

-  | PExpand (Asmblock.Pdiv)                 => Pdiv

-  | PExpand (Asmblock.Pdivu)                => Pdivu

   | PCtlFlow Asmblock.Pret                  => Pret

   | PCtlFlow (Asmblock.Pcall l)             => Pcall l

   | PCtlFlow (Asmblock.Picall r)            => Picall r

diff --git a/mppa_k1c/Asmblock.v b/mppa_k1c/Asmblock.v
index d335801e..fdec8ed2 100644
--- a/mppa_k1c/Asmblock.v
+++ b/mppa_k1c/Asmblock.v
@@ -178,10 +178,7 @@ Inductive ex_instruction : Type :=
   | Pbtbl   (r: ireg)  (tbl: list label)            (**r N-way branch through a jump table *) *)
 
   | Pbuiltin: external_function -> list (builtin_arg preg)
-              -> builtin_res preg -> ex_instruction   (**r built-in function (pseudo) *)
-  | Pdiv                                              (**r 32 bits integer division, call to __divdi3 *)
-  | Pdivu                                             (**r 32 bits integer division, call to __udivdi3 *)
-.
+              -> builtin_res preg -> ex_instruction   (**r built-in function (pseudo) *).
 
 (** FIXME: comment not up to date !
 
@@ -1486,17 +1483,6 @@ Definition exec_control (f: function) (oc: option control) (rs: regset) (m: mem)
 (** Pseudo-instructions *)
   | Pbuiltin ef args res =>
       Stuck (**r treated specially below *)
-  | Pdiv =>
-      match Val.divs (rs GPR0) (rs GPR1) with
-      | Some v => Next (rs # GPR0 <- v # RA <- (rs RA)) m
-      | None => Stuck
-      end
-
-  | Pdivu =>
-      match Val.divu (rs GPR0) (rs GPR1) with
-      | Some v => Next (rs # GPR0 <- v # RA <- (rs RA)) m
-      | None => Stuck
-      end
   end
   | None => Next rs m
 end.
diff --git a/mppa_k1c/Asmblockdeps.v b/mppa_k1c/Asmblockdeps.v
index 501ec212..ad96ae87 100644
--- a/mppa_k1c/Asmblockdeps.v
+++ b/mppa_k1c/Asmblockdeps.v
@@ -540,8 +540,6 @@ Definition trans_control (ctl: control) : macro :=
   | Pj_l l => [(#PC, Op (Control (Oj_l l)) (Name (#PC) @ Enil))]
   | Pcb bt r l => [(#PC, Op (Control (Ocb bt l)) (Name (#r) @ Name (#PC) @ Enil))]
   | Pcbu bt r l => [(#PC, Op (Control (Ocbu bt l)) (Name (#r) @ Name (#PC) @ Enil))]
-  | Pdiv => [(#GPR0, Op (Control Odiv) (Name (#GPR0) @ Name (#GPR1) @ Enil)); (#RA, Name (#RA))]
-  | Pdivu => [(#GPR0, Op (Control Odivu) (Name (#GPR0) @ Name (#GPR1) @ Enil)); (#RA, Name (#RA))]
   | Pbuiltin ef args res => [(#PC, Op (Control (OError)) Enil)]
   end.
 
@@ -863,22 +861,6 @@ Proof.
   intros. destruct ex.
   - simpl in *. inv H1. destruct c; destruct i; try discriminate.
     all: try (inv H0; eexists; split; try split; [ simpl control_eval; pose (H3 PC); simpl in e; rewrite e; reflexivity | Simpl | intros rr; destruct rr; Simpl]).
-    (* Pdiv *)
-    + destruct (Val.divs _ _) eqn:DIVS; try discriminate. inv H0. unfold nextblock in DIVS. repeat (rewrite Pregmap.gso in DIVS; try discriminate).
-      eexists; split; try split.
-      * simpl control_eval. pose (H3 PC); simpl in e; rewrite e; clear e. simpl.
-        Simpl. pose (H3 GPR0); rewrite e; clear e. pose (H3 GPR1); rewrite e; clear e. rewrite DIVS.
-        Simpl.
-      * Simpl.
-      * intros rr; destruct rr; Simpl. destruct (preg_eq GPR0 g); Simpl. rewrite e. Simpl.
-    (* Pdivu *)
-    + destruct (Val.divu _ _) eqn:DIVU; try discriminate. inv H0. unfold nextblock in DIVU. repeat (rewrite Pregmap.gso in DIVU; try discriminate).
-      eexists; split; try split.
-      * simpl control_eval. pose (H3 PC); simpl in e; rewrite e; clear e. simpl.
-        Simpl. pose (H3 GPR0); rewrite e; clear e. pose (H3 GPR1); rewrite e; clear e. rewrite DIVU.
-        Simpl.
-      * Simpl.
-      * intros rr; destruct rr; Simpl. destruct (preg_eq GPR0 g); Simpl. rewrite e. Simpl.
     (* Pj_l *)
     + unfold goto_label in H0. destruct (label_pos _ _ _) eqn:LPOS; try discriminate. destruct (nextblock _ _ _) eqn:NB; try discriminate. inv H0.
       eexists; split; try split.
@@ -1070,12 +1052,6 @@ Lemma exec_exit_none:
 Proof.
   intros. inv H0. destruct ex as [ctl|]; try discriminate.
   destruct ctl; destruct i; try reflexivity; try discriminate.
-(* Pdiv *)
-  - simpl in *. pose (H3 GPR0); rewrite e in H1; clear e. pose (H3 GPR1); rewrite e in H1; clear e.
-    destruct (Val.divs _ _); try discriminate; auto.
-(* Pdivu *)
-  - simpl in *. pose (H3 GPR0); rewrite e in H1; clear e. pose (H3 GPR1); rewrite e in H1; clear e.
-    destruct (Val.divu _ _); try discriminate; auto.
 (* Pj_l *)
   - simpl in *. pose (H3 PC); simpl in e; rewrite e in H1. clear e.
     unfold goto_label_deps in H1. unfold goto_label.
@@ -1187,11 +1163,6 @@ Lemma forward_simu_exit_stuck:
 Proof.
   intros. inv H1. destruct ex as [ctl|]; try discriminate.
   destruct ctl; destruct i; try discriminate; try (simpl; reflexivity).
-(* Pdiv *)
-  - simpl in *. pose (H3 GPR0); simpl in e; rewrite e; clear e. pose (H3 GPR1); simpl in e; rewrite e; clear e.
-    destruct (Val.divs _ _); try discriminate; auto.
-  - simpl in *. pose (H3 GPR0); simpl in e; rewrite e; clear e. pose (H3 GPR1); simpl in e; rewrite e; clear e.
-    destruct (Val.divu _ _); try discriminate; auto.
 (* Pj_l *)
   - simpl in *. pose (H3 PC); simpl in e; rewrite e. unfold goto_label_deps. unfold goto_label in H0.
     destruct (label_pos _ _ _); auto. clear e. destruct (rs PC); auto. discriminate.
diff --git a/mppa_k1c/Asmblockgen.v b/mppa_k1c/Asmblockgen.v
index 5b00a64f..c03e319c 100644
--- a/mppa_k1c/Asmblockgen.v
+++ b/mppa_k1c/Asmblockgen.v
@@ -425,18 +425,6 @@ Definition transl_op
       OK (mulimm32 rd rs1 n ::i k)
   | Omulhs, _ => Error(msg "Asmblockgen.transl_op: Omulhs") (* Normalement pas émis *)
   | Omulhu, _ => Error(msg "Asmblockgen.transl_op: Omulhu") (* Normalement pas émis *)
-  | Odiv, a1 :: a2 :: nil => Error(msg "Asmblockgen.transl_op: Odiv: 32-bits division not supported yet. Please use 64-bits.")
-      (* do rd <- ireg_of res; do rs1 <- ireg_of a1; do rs2 <- ireg_of a2;
-      OK (Pdivw rd rs1 rs2 :: k) *)
-  | Odivu, a1 :: a2 :: nil => Error(msg "Asmblockgen.transl_op: Odivu: 32-bits division not supported yet. Please use 64-bits.")
-      (* do rd <- ireg_of res; do rs1 <- ireg_of a1; do rs2 <- ireg_of a2;
-      OK (Pdivuw rd rs1 rs2 :: k) *)
-  | Omod, a1 :: a2 :: nil => Error(msg "Asmblockgen.transl_op: Omod: 32-bits modulo not supported yet. Please use 64-bits.")
-      (* do rd <- ireg_of res; do rs1 <- ireg_of a1; do rs2 <- ireg_of a2;
-      OK (Premw rd rs1 rs2 :: k) *)
-  | Omodu, a1 :: a2 :: nil => Error(msg "Asmblockgen.transl_op: Omodu: 32-bits modulo not supported yet. Please use 64-bits.")
-      (* do rd <- ireg_of res; do rs1 <- ireg_of a1; do rs2 <- ireg_of a2;
-      OK (Premuw rd rs1 rs2 :: k) *)
   | Oand, a1 :: a2 :: nil =>
       do rd <- ireg_of res; do rs1 <- ireg_of a1; do rs2 <- ireg_of a2;
       OK (Pandw rd rs1 rs2 ::i k)
diff --git a/mppa_k1c/Asmexpand.ml b/mppa_k1c/Asmexpand.ml
index 1c9e4e4c..f1528389 100644
--- a/mppa_k1c/Asmexpand.ml
+++ b/mppa_k1c/Asmexpand.ml
@@ -124,9 +124,6 @@ let expand_annot_val kind txt targ args res = assert false
 
 (* Handling of memcpy *)
 
-let offset_in_range ofs =
-  let ofs = Z.to_int64 ofs in -2048L <= ofs && ofs < 2048L
-
 let emit_move dst r =
   if dst <> r
   then emit (Paddil(dst, r, Z.zero));;
@@ -175,7 +172,7 @@ let expand_builtin_memcpy  sz al args =
   | _ -> assert false;;
 
 (* Handling of volatile reads and writes *)
-
+(* FIXME probably need to check for size of displacement *)
 let expand_builtin_vload_common chunk base ofs res =
   match chunk, res with
   | Mint8unsigned, BR(Asmblock.IR res) ->
@@ -211,21 +208,9 @@ let expand_builtin_vload chunk args res =
   | [BA(Asmblock.IR addr)] ->
       expand_builtin_vload_common chunk addr _0 res
   | [BA_addrstack ofs] ->
-      if offset_in_range (Z.add ofs (Memdata.size_chunk chunk)) then
-        expand_builtin_vload_common chunk stack_pointer ofs res
-      else begin
-        assert false (* FIXME
-        expand_addptrofs Asmblock.GPR32 stack_pointer ofs; (* X31 <- sp + ofs *)
-        expand_builtin_vload_common chunk GPR32 _0 res *)
-      end
+     expand_builtin_vload_common chunk stack_pointer ofs res
   | [BA_addptr(BA(Asmblock.IR addr), (BA_int ofs | BA_long ofs))] ->
-      if offset_in_range (Z.add ofs (Memdata.size_chunk chunk)) then
-        expand_builtin_vload_common chunk addr ofs res
-      else begin
-          assert false (* FIXME
-        expand_addptrofs Asmblock.GPR32 addr ofs; (* X31 <- addr + ofs *)
-        expand_builtin_vload_common chunk Asmblock.GPR32 _0 res *)
-      end
+     expand_builtin_vload_common chunk addr ofs res
   | _ ->
       assert false
 
@@ -256,19 +241,9 @@ let expand_builtin_vstore chunk args =
   | [BA(Asmblock.IR addr); src] ->
       expand_builtin_vstore_common chunk addr _0 src
   | [BA_addrstack ofs; src] ->
-      if offset_in_range (Z.add ofs (Memdata.size_chunk chunk)) then
-        expand_builtin_vstore_common chunk stack_pointer ofs src
-      else begin (* FIXME 
-        expand_addptrofs X31 X2 ofs; (* X31 <- sp + ofs *)
-        expand_builtin_vstore_common chunk X31 _0 src *)
-      end
+     expand_builtin_vstore_common chunk stack_pointer ofs src
   | [BA_addptr(BA(Asmblock.IR addr), (BA_int ofs | BA_long ofs)); src] ->
-      if offset_in_range (Z.add ofs (Memdata.size_chunk chunk)) then
-        expand_builtin_vstore_common chunk addr ofs src
-      else begin (* FIXME
-        expand_addptrofs X31 addr ofs; (* X31 <- addr + ofs *)
-        expand_builtin_vstore_common chunk X31 _0 src *)
-      end
+     expand_builtin_vstore_common chunk addr ofs src
   | _ ->
       assert false
 
diff --git a/mppa_k1c/PostpassSchedulingOracle.ml b/mppa_k1c/PostpassSchedulingOracle.ml
index 2c39e342..56b00c7e 100644
--- a/mppa_k1c/PostpassSchedulingOracle.ml
+++ b/mppa_k1c/PostpassSchedulingOracle.ml
@@ -222,7 +222,6 @@ let basic_rec i =
   | Pnop -> { inst = "nop"; write_locs = []; read_locs = []; imm = None ; is_control = false}
 
 let expand_rec = function
-  | Pdiv | Pdivu -> { inst = "Pdiv"; write_locs = [Reg (IR GPR0)]; read_locs = [Reg (IR GPR0); Reg (IR GPR1)]; imm = None; is_control = true }
   | Pbuiltin _ -> raise OpaqueInstruction
 
 let ctl_flow_rec = function
diff --git a/mppa_k1c/SelectLong.vp b/mppa_k1c/SelectLong.vp
index 3a17ab17..0c3618d7 100644
--- a/mppa_k1c/SelectLong.vp
+++ b/mppa_k1c/SelectLong.vp
@@ -21,6 +21,7 @@ Require Import Coqlib.
 Require Import Compopts.
 Require Import AST Integers Floats.
 Require Import Op CminorSel.
+Require Import OpHelpers.
 Require Import SelectOp SplitLong.
 
 Local Open Scope cminorsel_scope.
diff --git a/mppa_k1c/SelectLongproof.v b/mppa_k1c/SelectLongproof.v
index 4723278a..79187338 100644
--- a/mppa_k1c/SelectLongproof.v
+++ b/mppa_k1c/SelectLongproof.v
@@ -21,6 +21,7 @@ Require Import String Coqlib Maps Integers Floats Errors.
 Require Archi.
 Require Import AST Values Memory Globalenvs Events.
 Require Import Cminor Op CminorSel.
+Require Import OpHelpers OpHelpersproof.
 Require Import SelectOp SelectOpproof SplitLong SplitLongproof.
 Require Import SelectLong.
 
diff --git a/mppa_k1c/SelectOp.vp b/mppa_k1c/SelectOp.vp
index e4d65ced..f6605c11 100644
--- a/mppa_k1c/SelectOp.vp
+++ b/mppa_k1c/SelectOp.vp
@@ -15,6 +15,7 @@
 (*                                                                     *)
 (* *********************************************************************)
 
+
 (** Instruction selection for operators *)
 
 (** The instruction selection pass recognizes opportunities for using
@@ -49,9 +50,17 @@ Require Import Integers.
 Require Import Floats.
 Require Import Op.
 Require Import CminorSel.
+Require Import OpHelpers.
 
 Local Open Scope cminorsel_scope.
 
+Local Open Scope string_scope.
+Local Open Scope error_monad_scope.
+
+Section SELECT.
+
+Context {hf: helper_functions}.
+
 (** ** Constants **)
 
 Definition addrsymbol (id: ident) (ofs: ptrofs) :=
@@ -302,10 +311,17 @@ Nondetfunction notint (e: expr) :=
 
 (** ** Integer division and modulus *)
 
-Definition divs_base (e1: expr) (e2: expr) := Eop Odiv (e1:::e2:::Enil).
-Definition mods_base (e1: expr) (e2: expr) := Eop Omod (e1:::e2:::Enil).
-Definition divu_base (e1: expr) (e2: expr) := Eop Odivu (e1:::e2:::Enil).
-Definition modu_base (e1: expr) (e2: expr) := Eop Omodu (e1:::e2:::Enil).
+Definition divs_base (e1: expr) (e2: expr) :=
+  Eexternal i32_sdiv sig_ii_i (e1 ::: e2 ::: Enil).
+  
+Definition mods_base (e1: expr) (e2: expr) :=
+  Eexternal i32_smod sig_ii_i (e1 ::: e2 ::: Enil).
+
+Definition divu_base (e1: expr) (e2: expr) :=
+  Eexternal i32_udiv sig_ii_i (e1 ::: e2 ::: Enil).
+  
+Definition modu_base (e1: expr) (e2: expr) :=
+  Eexternal i32_umod sig_ii_i (e1 ::: e2 ::: Enil).
 
 Definition shrximm (e1: expr) (n2: int) :=
   if Int.eq n2 Int.zero then e1 else Eop (Oshrximm n2) (e1:::Enil).
@@ -485,3 +501,14 @@ Nondetfunction builtin_arg (e: expr) :=
       if Archi.ptr64 then BA_addptr (BA e1) (BA_long n) else BA e
   | _ => BA e
   end.
+
+(* float division *)
+
+Definition divf_base (e1: expr) (e2: expr) :=
+  (* Eop Odivf (e1 ::: e2 ::: Enil). *)
+  Eexternal f64_div sig_ff_f (e1 ::: e2 ::: Enil).
+
+Definition divfs_base (e1: expr) (e2: expr) :=
+  (* Eop Odivf (e1 ::: e2 ::: Enil). *)
+  Eexternal f32_div sig_ss_s (e1 ::: e2 ::: Enil).
+End SELECT.
diff --git a/mppa_k1c/SelectOpproof.v b/mppa_k1c/SelectOpproof.v
index 94d162a2..89af39ee 100644
--- a/mppa_k1c/SelectOpproof.v
+++ b/mppa_k1c/SelectOpproof.v
@@ -29,8 +29,13 @@ Require Import Cminor.
 Require Import Op.
 Require Import CminorSel.
 Require Import SelectOp.
+Require Import Events.
+Require Import OpHelpers.
+Require Import OpHelpersproof.
 
 Local Open Scope cminorsel_scope.
+Local Open Scope string_scope.
+
 
 (** * Useful lemmas and tactics *)
 
@@ -80,12 +85,53 @@ Ltac TrivialExists :=
 (** * Correctness of the smart constructors *)
 
 Section CMCONSTR.
-
-Variable ge: genv.
+Variable prog: program.
+Variable hf: helper_functions.
+Hypothesis HELPERS: helper_functions_declared prog hf.
+Let ge := Genv.globalenv prog.
 Variable sp: val.
 Variable e: env.
 Variable m: mem.
 
+(* Helper lemmas - from SplitLongproof.v *)
+
+Ltac UseHelper := decompose [Logic.and] arith_helpers_correct; eauto.
+Ltac DeclHelper := red in HELPERS; decompose [Logic.and] HELPERS; eauto.
+
+Lemma eval_helper:
+  forall le id name sg args vargs vres,
+  eval_exprlist ge sp e m le args vargs ->
+  helper_declared prog id name sg  ->
+  external_implements name sg vargs vres ->
+  eval_expr ge sp e m le (Eexternal id sg args) vres.
+Proof.
+  intros.
+  red in H0. apply Genv.find_def_symbol in H0. destruct H0 as (b & P & Q).
+  rewrite <- Genv.find_funct_ptr_iff in Q.
+  econstructor; eauto.
+Qed.
+
+Corollary eval_helper_1:
+  forall le id name sg arg1 varg1 vres,
+  eval_expr ge sp e m le arg1 varg1 ->
+  helper_declared prog id name sg  ->
+  external_implements name sg (varg1::nil) vres ->
+  eval_expr ge sp e m le (Eexternal id sg (arg1 ::: Enil)) vres.
+Proof.
+  intros. eapply eval_helper; eauto. constructor; auto. constructor.
+Qed.
+
+Corollary eval_helper_2:
+  forall le id name sg arg1 arg2 varg1 varg2 vres,
+  eval_expr ge sp e m le arg1 varg1 ->
+  eval_expr ge sp e m le arg2 varg2 ->
+  helper_declared prog id name sg  ->
+  external_implements name sg (varg1::varg2::nil) vres ->
+  eval_expr ge sp e m le (Eexternal id sg (arg1 ::: arg2 ::: Enil)) vres.
+Proof.
+  intros. eapply eval_helper; eauto. constructor; auto. constructor; auto. constructor.
+Qed.
+
 (** We now show that the code generated by "smart constructor" functions
   such as [Selection.notint] behaves as expected.  Continuing the
   [notint] example, we show that if the expression [e]
@@ -557,7 +603,8 @@ Theorem eval_divs_base:
     Val.divs x y = Some z ->
     exists v, eval_expr ge sp e m le (divs_base a b) v /\ Val.lessdef z v.
 Proof.
-  intros. unfold divs_base. exists z; split. EvalOp. auto.
+  intros; unfold divs_base.
+  econstructor; split. eapply eval_helper_2; eauto. DeclHelper. UseHelper. auto.
 Qed.
 
 Theorem eval_mods_base:
@@ -567,7 +614,8 @@ Theorem eval_mods_base:
     Val.mods x y = Some z ->
     exists v, eval_expr ge sp e m le (mods_base a b) v /\ Val.lessdef z v.
 Proof.
-  intros. unfold mods_base. exists z; split. EvalOp. auto.
+  intros; unfold mods_base.
+  econstructor; split. eapply eval_helper_2; eauto. DeclHelper. UseHelper. auto.
 Qed.
 
 Theorem eval_divu_base:
@@ -577,7 +625,8 @@ Theorem eval_divu_base:
     Val.divu x y = Some z ->
     exists v, eval_expr ge sp e m le (divu_base a b) v /\ Val.lessdef z v.
 Proof.
-  intros. unfold divu_base. exists z; split. EvalOp. auto.
+  intros; unfold divu_base.
+  econstructor; split. eapply eval_helper_2; eauto. DeclHelper. UseHelper. auto.
 Qed.
 
 Theorem eval_modu_base:
@@ -587,7 +636,8 @@ Theorem eval_modu_base:
     Val.modu x y = Some z ->
     exists v, eval_expr ge sp e m le (modu_base a b) v /\ Val.lessdef z v.
 Proof.
-  intros. unfold modu_base. exists z; split. EvalOp. auto.
+  intros; unfold modu_base.
+  econstructor; split. eapply eval_helper_2; eauto. DeclHelper. UseHelper. auto.
 Qed.
 
 Theorem eval_shrximm:
@@ -968,4 +1018,24 @@ Proof.
 - constructor; auto.
 Qed.
 
+(* floating-point division *)
+Theorem eval_divf_base:
+  forall le a b x y,
+  eval_expr ge sp e m le a x ->
+  eval_expr ge sp e m le b y ->
+  exists v, eval_expr ge sp e m le (divf_base a b) v /\ Val.lessdef (Val.divf x y) v.
+Proof.
+  intros; unfold divf_base.
+  econstructor; split. eapply eval_helper_2; eauto. DeclHelper. UseHelper. auto.
+Qed.
+
+Theorem eval_divfs_base:
+  forall le a b x y,
+  eval_expr ge sp e m le a x ->
+  eval_expr ge sp e m le b y ->
+  exists v, eval_expr ge sp e m le (divfs_base a b) v /\ Val.lessdef (Val.divfs x y) v.
+Proof.
+  intros; unfold divfs_base.
+  econstructor; split. eapply eval_helper_2; eauto. DeclHelper. UseHelper. auto.
+Qed.
 End CMCONSTR.
diff --git a/mppa_k1c/TargetPrinter.ml b/mppa_k1c/TargetPrinter.ml
index 9ab7ccd9..41a6622a 100644
--- a/mppa_k1c/TargetPrinter.ml
+++ b/mppa_k1c/TargetPrinter.ml
@@ -258,10 +258,6 @@ module Target (*: TARGET*) =
          fprintf oc "	goto	%a\n" symbol s
       | Pigoto(rs) ->
          fprintf oc "	igoto	%a\n" ireg rs
-      | Pdiv ->
-         fprintf oc "	call	__divdi3\n"
-      | Pdivu ->
-         fprintf oc "	call	__udivdi3\n"
       | Pj_l(s) ->
          fprintf oc "	goto	%a\n" print_label s
       | Pcb (bt, r, lbl) | Pcbu (bt, r, lbl) ->