diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/synth/netlists-memories.adb | 107 |
1 files changed, 75 insertions, 32 deletions
diff --git a/src/synth/netlists-memories.adb b/src/synth/netlists-memories.adb index a29ec0d33..597df7dee 100644 --- a/src/synth/netlists-memories.adb +++ b/src/synth/netlists-memories.adb @@ -1557,25 +1557,6 @@ package body Netlists.Memories is end loop; end Reduce_Extract_Muxes; - -- Extract the step (equivalent to data width) of a dyn_insert/dyn_extract - -- address. This is either a memidx or an addidx gate. - function Extract_Memidx_Step (Memidx : Instance) return Width - is - Inst : Instance; - begin - Inst := Memidx; - loop - case Get_Id (Inst) is - when Id_Addidx => - Inst := Get_Input_Instance (Inst, 1); - when Id_Memidx => - return Get_Param_Uns32 (Inst, 0); - when others => - raise Internal_Error; - end case; - end loop; - end Extract_Memidx_Step; - type Off_Array is array (Int32 range <>) of Uns32; type Off_Array_Acc is access Off_Array; @@ -1747,23 +1728,75 @@ package body Netlists.Memories is end case; end Extract_Sub_Constant; + -- Physical dimension of the memory. + type Mem_Dim_Type is record + Data_Wd : Width; + Depth : Uns32; + -- Number of dimensions. + Dim : Natural; + end record; + + -- Extract the dim (equivalent to data width) of a dyn_insert/dyn_extract + -- address. This is either a memidx or an addidx gate. + function Extract_Memidx_Dim (Memidx : Instance) return Mem_Dim_Type + is + Res : Mem_Dim_Type; + Inst : Instance; + Idx : Instance; + begin + Inst := Memidx; + Res := (Data_Wd => 0, Depth => 1, Dim => 0); + loop + case Get_Id (Inst) is + when Id_Addidx => + -- Handle the memidx, ... + Idx := Get_Input_Instance (Inst, 0); + -- .. and continue with the chain. + Inst := Get_Input_Instance (Inst, 1); + when Id_Memidx => + -- Just handle the memidx. + Idx := Inst; + Inst := No_Instance; + when others => + raise Internal_Error; + end case; + Res.Dim := Res.Dim + 1; + Res.Data_Wd := Get_Param_Uns32 (Idx, 0); + Res.Depth := Res.Depth * (Get_Param_Uns32 (Idx, 1) + 1); + if Inst = No_Instance then + return Res; + end if; + end loop; + end Extract_Memidx_Dim; + -- Subroutine of Convert_To_Memory. -- -- Compute the number of ports (dyn_extract and dyn_insert) and the width -- of the memory. Just walk all the gates. - procedure Compute_Ports_And_Width - (Sig : Instance; Nbr_Ports : out Int32; Wd : out Width) + procedure Compute_Ports_And_Dim + (Sig : Instance; Nbr_Ports : out Int32; Dim : out Mem_Dim_Type) is - procedure Add_Port_And_Width (Memidx : Instance) is + procedure Add_Port_And_Width (Memidx : Instance) + is + T : Mem_Dim_Type; begin Nbr_Ports := Nbr_Ports + 1; - if Wd = 0 then - Wd := Extract_Memidx_Step (Memidx); - elsif Wd /= Extract_Memidx_Step (Memidx) then - Info_Msg_Synth (+Sig, "memory %n uses different widths", + T := Extract_Memidx_Dim (Memidx); + if Nbr_Ports = 1 then + Dim := T; + else + -- TODO: handle different width and depth. + if T.Data_Wd /= Dim.Data_Wd then + Info_Msg_Synth (+Sig, "memory %n uses different widths", (1 => +Sig)); - Nbr_Ports := 0; - return; + Nbr_Ports := 0; + return; + elsif T.Depth /= Dim.Depth then + Info_Msg_Synth (+Sig, "memory %n uses different depth", + (1 => +Sig)); + Nbr_Ports := 0; + return; + end if; end if; end Add_Port_And_Width; @@ -1771,7 +1804,7 @@ package body Netlists.Memories is Inp2 : Input; begin Nbr_Ports := 0; - Wd := 0; + Dim.Dim := 0; -- Top-level loop, for each parallel path of multiport RAMs. Inp2 := Get_First_Sink (Get_Output (Sig, 0)); @@ -1837,7 +1870,7 @@ package body Netlists.Memories is end case; Inp2 := Get_Next_Sink (Inp2); end loop; - end Compute_Ports_And_Width; + end Compute_Ports_And_Dim; -- Subroutine of Convert_To_Memory. -- @@ -2166,10 +2199,13 @@ package body Netlists.Memories is Sig_Name : constant Sname := Get_Instance_Name (Sig); + Dim : Mem_Dim_Type; + -- Width of the RAM, computed from the step of memidx. + -- Width is the length of the data bus. Mem_W : Width; - -- Number of addresses of the memory. + -- Number of elements of the memory. -- Sz = W * Depth. Mem_Depth : Uns32; @@ -2193,10 +2229,11 @@ package body Netlists.Memories is Nbr_Ports := 0; Mem_W := 0; Inst := Sig; - Compute_Ports_And_Width (Sig, Nbr_Ports, Mem_W); + Compute_Ports_And_Dim (Sig, Nbr_Ports, Dim); if Nbr_Ports = 0 then return; end if; + Mem_W := Dim.Data_Wd; if Mem_W = 0 then -- No ports ? @@ -2216,6 +2253,10 @@ package body Netlists.Memories is end if; -- 2. Walk to extract offsets/width + -- NOTE: ideally, there are two kinds of offsets: + -- * offsets within the width: when the data is a struct + -- * offsets larger than the size: multiple memories, which may have + -- different sizes. Offs := new Off_Array (1 .. 2 * Nbr_Ports); Extract_Ports_Offsets (Sig, Offs, Nbr_Offs); @@ -2370,6 +2411,7 @@ package body Netlists.Memories is end case; end Is_Const_Input; + -- The main entry point. procedure Extract_Memories (Ctxt : Context_Acc; M : Module) is Dyns : Instance_Tables.Instance; @@ -2433,6 +2475,7 @@ package body Netlists.Memories is -- Unmark memory gates. Unmark_Table (Mems); + -- Convert to RAM or ROM. for I in Instance_Tables.First .. Instance_Tables.Last (Mems) loop -- INST is the memorizing instance, ie isignal/signal. Inst := Mems.Table (I); |