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-- Expand dyn gates.
-- Copyright (C) 2019 Tristan Gingold
--
-- This file is part of GHDL.
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; either version 2 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
-- MA 02110-1301, USA.
with Mutils; use Mutils;
with Netlists.Gates; use Netlists.Gates;
with Netlists.Utils; use Netlists.Utils;
with Netlists.Butils; use Netlists.Butils;
with Netlists.Locations; use Netlists.Locations;
with Netlists.Memories; use Netlists.Memories;
package body Netlists.Expands is
function Count_Nbr_Elements (Addr : Net) return Natural
is
N : Net;
Inst, Inst1 : Instance;
Res : Natural;
Max : Uns32;
begin
N := Addr;
Res := 1;
loop
Inst := Get_Net_Parent (N);
case Get_Id (Inst) is
when Id_Memidx =>
Inst1 := Inst;
when Id_Addidx =>
Inst1 := Get_Net_Parent (Get_Input_Net (Inst, 1));
pragma Assert (Get_Id (Inst1) = Id_Memidx);
N := Get_Input_Net (Inst, 0);
when others =>
raise Internal_Error;
end case;
Max := Get_Param_Uns32 (Inst1, 1);
pragma Assert (Max /= 0);
Res := Res * Natural (Max);
exit when Inst1 = Inst;
end loop;
return Res;
end Count_Nbr_Elements;
-- IDX is the next index to be fill in ELS.
-- OFF is offset for extraction from VAL.
-- ADDR_OFF is the address offset.
procedure Fill_Els (Ctxt : Context_Acc;
Val : Net;
Els : Case_Element_Array_Acc;
Idx : in out Positive;
Addr : Net;
Off : in out Uns32;
W : Width;
Sel : in out Uns64)
is
Inst : Instance;
Sub_Inst : Instance;
begin
-- Extract memidx.
Inst := Get_Net_Parent (Addr);
case Get_Id (Inst) is
when Id_Memidx =>
-- Found.
Sub_Inst := No_Instance;
null;
when Id_Addidx =>
-- Will recurse.
Sub_Inst := Get_Net_Parent (Get_Input_Net (Inst, 0));
Inst := Get_Net_Parent (Get_Input_Net (Inst, 1));
pragma Assert (Get_Id (Inst) = Id_Memidx);
when others =>
raise Internal_Error;
end case;
declare
Step : constant Uns32 := Get_Param_Uns32 (Inst, 0);
Max : constant Uns32 := Get_Param_Uns32 (Inst, 1);
begin
pragma Assert (Max /= 0);
for I in 0 .. Max - 1 loop
if Sub_Inst /= No_Instance then
-- recurse.
raise Internal_Error;
else
Els (Idx) := (Sel => Sel,
Val => Build_Extract (Ctxt, Val, Off, W));
Idx := Idx + 1;
Sel := Sel + 1;
Off := Off + Step;
end if;
end loop;
end;
end Fill_Els;
-- Extract address from memidx/addidx and remove those gates.
procedure Extract_Address
(Ctxt : Context_Acc; Addr_Net : Net; Ndims : Natural; Addr : out Net)
is
Res_Arr : Net_Array (1 .. Int32 (Ndims));
P : Int32;
Inst, Inst1 : Instance;
Inp : Input;
N : Net;
begin
P := Res_Arr'Last;
N := Addr_Net;
loop
Inst := Get_Net_Parent (N);
case Get_Id (Inst) is
when Id_Memidx =>
Inst1 := Inst;
when Id_Addidx =>
-- Extract memidx.
Inp := Get_Input (Inst, 1);
Inst1 := Get_Net_Parent (Get_Driver (Inp));
pragma Assert (Get_Id (Inst1) = Id_Memidx);
Disconnect (Inp);
-- Extract next.
Inp := Get_Input (Inst, 0);
N := Get_Driver (Inp);
Disconnect (Inp);
Remove_Instance (Inst);
when others =>
raise Internal_Error;
end case;
-- INST1 is a memidx.
Inp := Get_Input (Inst1, 0);
Res_Arr (P) := Get_Driver (Inp);
P := P - 1;
Disconnect (Inp);
Remove_Instance (Inst1);
exit when Inst1 = Inst;
end loop;
pragma Assert (P = 0);
Addr := Build2_Concat (Ctxt, Res_Arr);
end Extract_Address;
procedure Expand_Dyn_Extract (Ctxt : Context_Acc; Inst : Instance)
is
Val : constant Net := Get_Input_Net (Inst, 0);
Addr_Net : constant Net := Get_Input_Net (Inst, 1);
Loc : constant Location_Type := Get_Location (Inst);
W : constant Width := Get_Width (Get_Output (Inst, 0));
-- 1. compute number of dims, check order.
Ndims : constant Natural := Count_Memidx (Addr_Net);
-- 2. compute number of cells.
Nbr_Els : constant Natural := Count_Nbr_Elements (Addr_Net);
Addr_Len : Uns32;
Els : Case_Element_Array_Acc;
Idx : Positive;
Off : Uns32;
Sel : Uns64;
Res : Net;
Addr : Net;
Def : Net;
begin
-- 2. build extract gates
Els := new Case_Element_Array (1 .. Nbr_Els);
Idx := 1;
Off := Get_Param_Uns32 (Inst, 0);
Sel := 0;
Fill_Els (Ctxt, Val, Els, Idx, Addr_Net, Off, W, Sel);
-- 3. build mux tree
Extract_Address (Ctxt, Addr_Net, Ndims, Addr);
Addr_Len := Uns32 (Clog2 (Uns64 (Nbr_Els)));
if Get_Width (Addr) > Addr_Len then
-- Truncate the address. This is requied so that synth_case doesn't
-- use default value.
Addr := Build_Trunc (Ctxt, Id_Utrunc, Addr, Addr_Len);
end if;
Def := No_Net;
Synth_Case (Ctxt, Addr, Els.all, Def, Res, Loc);
-- 4. remove old dyn_extract.
Disconnect (Get_Input (Inst, 0));
Disconnect (Get_Input (Inst, 1));
Redirect_Inputs (Get_Output (Inst, 0), Res);
Remove_Instance (Inst);
Free_Case_Element_Array (Els);
end Expand_Dyn_Extract;
procedure Expand_Gates (Ctxt : Context_Acc; M : Module)
is
Inst : Instance;
begin
Inst := Get_First_Instance (M);
while Inst /= No_Instance loop
-- Walk all the instances of M:
case Get_Id (Inst) is
when Id_Dyn_Extract =>
Expand_Dyn_Extract (Ctxt, Inst);
when others =>
null;
end case;
Inst := Get_Next_Instance (Inst);
end loop;
end Expand_Gates;
end Netlists.Expands;
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