############################################################################## # Build global options # NOTE: Can be overridden externally. # # Compiler options here. ifeq ($(USE_OPT),) USE_OPT = -O2 -ggdb -fomit-frame-pointer -falign-functions=16 endif # C specific options here (added to USE_OPT). ifeq ($(USE_COPT),) USE_COPT = endif # C++ specific options here (added to USE_OPT). ifeq ($(USE_CPPOPT),) USE_CPPOPT = -fno-rtti endif # Enable this if you want the linker to remove unused code and data ifeq ($(USE_LINK_GC),) USE_LINK_GC = yes endif # If enabled, this option allows to compile the application in THUMB mode. ifeq ($(USE_THUMB),) USE_THUMB = yes endif # Enable this if you want to see the full log while compiling. ifeq ($(USE_VERBOSE_COMPILE),) USE_VERBOSE_COMPILE = no endif # # Build global options ############################################################################## ############################################################################## # Architecture or project specific options # # Enable this if you really want to use the STM FWLib. ifeq ($(USE_FWLIB),) USE_FWLIB = no endif # # Architecture or project specific options ############################################################################## ############################################################################## # Project, sources and paths # # Define project name here PROJECT = ch # Imported source files and paths CHIBIOS = ../../.. include $(CHIBIOS)/boards/ST_STM32L_DISCOVERY/board.mk include $(CHIBIOS)/os/hal/platforms/STM32L1xx/platform.mk include $(CHIBIOS)/os/hal/hal.mk include $(CHIBIOS)/os/ports/GCC/ARMCMx/STM32L1xx/port.mk include $(CHIBIOS)/os/kernel/kernel.mk #include $(CHIBIOS)/test/test.mk # Define linker script file here LDSCRIPT= $(PORTLD)/STM32L152xB.ld # C sources that can be compiled in ARM or THUMB mode depending on the global # setting. CSRC = $(PORTSRC) \ $(KERNSRC) \ $(TESTSRC) \ $(HALSRC) \ $(PLATFORMSRC) \ $(BOARDSRC) \ main.c # C++ sources that can be compiled in ARM or THUMB mode depending on the global # setting. CPPSRC = # C sources to be compiled in ARM mode regardless of the global setting. # NOTE: Mixing ARM and THUMB mode enables the -mthumb-interwork compiler # option that results in lower performance and larger code size. ACSRC = # C++ sources to be compiled in ARM mode regardless of the global setting. # NOTE: Mixing ARM and THUMB mode enables the -mthumb-interwork compiler # option that results in lower performance and larger code size. ACPPSRC = # C sources to be compiled in THUMB mode regardless of the global setting. # NOTE: Mixing ARM and THUMB mode enables the -mthumb-interwork compiler # option that results in lower performance and larger code size. TCSRC = # C sources to be compiled in THUMB mode regardless of the global setting. # NOTE: Mixing ARM and THUMB mode enables the -mthumb-interwork compiler # option that results in lower performance and larger code size. TCPPSRC = # List ASM source files here ASMSRC = $(PORTASM) INCDIR = $(PORTINC) $(KERNINC) $(TESTINC) \ $(HALINC) $(PLATFORMINC) $(BOARDINC) \ $(CHIBIOS)/os/various # # Project, sources and paths ############################################################################## ############################################################################## # Compiler settings # MCU = cortex-m3 #TRGT = arm-elf- TRGT = arm-none-eabi- CC = $(TRGT)gcc CPPC = $(TRGT)g++ # Enable loading with g++ only if you need C++ runtime support. # NOTE: You can use C++ even without C++ support if you are careful. C++ # runtime support makes code size explode. LD = $(TRGT)gcc #LD = $(TRGT)g++ CP = $(TRGT)objcopy AS = $(TRGT)gcc -x assembler-with-cpp OD = $(TRGT)objdump HEX = $(CP) -O ihex BIN = $(CP) -O binary # ARM-specific options here AOPT = # THUMB-specific options here TOPT = -mthumb -DTHUMB # Define C warning options here CWARN = -Wall -Wextra -Wstrict-prototypes # Define C++ warning options here CPPWARN = -Wall -Wextra # # Compiler settings ############################################################################## ############################################################################## # Start of default section # # List all default C defines here, like -D_DEBUG=1 DDEFS = # List all default ASM defines here, like -D_DEBUG=1 DADEFS = # List all default directories to look for include files here DINCDIR = # List the default directory to look for the libraries here DLIBDIR = # List all default libraries here DLIBS = # # End of default section ############################################################################## ############################################################################## # Start of user section # # List all user C define here, like -D_DEBUG=1 UDEFS = # Define ASM defines here UADEFS = # List all user directories here UINCDIR = # List the user directory to look for the libraries here ULIBDIR = # List all user libraries here ULIBS = # # End of user defines ############################################################################## ifeq ($(USE_FWLIB),yes) include $(CHIBIOS)/ext/stm32lib/stm32lib.mk CSRC += $(STM32SRC) INCDIR += $(STM32INC) USE_OPT += -DUSE_STDPERIPH_DRIVER endif include $(CHIBIOS)/os/ports/GCC/ARMCMx/rules.mk a id='n84' href='#n84'>84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 
--  Inference in synthesis.
--  Copyright (C) 2017 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 Netlists.Utils; use Netlists.Utils;
with Netlists.Gates; use Netlists.Gates;
with Netlists.Gates_Ports; use Netlists.Gates_Ports;
with Types; use Types;

package body Synth.Inference is
   type Mux_Info_Type is record
      Mux : Instance;
      Chain : Port_Nbr;
   end record;

   type Mux_Info_Arr is array (Natural range <>) of Mux_Info_Type;

   procedure Find_Longest_Loop
     (Val : Net; Prev_Val : Net; Res : out Instance; Dist : out Integer)
   is
      Inst : constant Instance := Get_Parent (Val);
   begin
      if Get_Id (Inst) = Id_Mux2 then
         declare
            Res0, Res1 : Instance;
            Dist0, Dist1 : Integer;
         begin
            Find_Longest_Loop
              (Get_Driver (Get_Mux2_I0 (Inst)), Prev_Val, Res0, Dist0);
            Find_Longest_Loop
              (Get_Driver (Get_Mux2_I1 (Inst)), Prev_Val, Res1, Dist1);
            --  Input1 has an higher priority than input0 in case the selector
            --  is a clock.
            --  FIXME: improve algorithm.
            if Dist1 > Dist0 then
               Dist := Dist1 + 1;
               if Dist1 > 0 then
                  Res := Res1;
               else
                  Res := Inst;
               end if;
            elsif Dist0 >= 0 then
               Dist := Dist0 + 1;
               if Dist0 > 0 then
                  Res := Res0;
               else
                  Res := Inst;
               end if;
            else
               pragma Assert (Dist1 < 0 and Dist0 < 0);
               Res := No_Instance;
               Dist := -1;
            end if;
         end;
      elsif Val = Prev_Val then
         Res := No_Instance;
         Dist := 0;
      else
         Res := No_Instance;
         Dist := -1;
      end if;
   end Find_Longest_Loop;

   --  Walk the And-net N, and extract clock (posedge/negedge) if found.
   --  ENABLE is N without the clock.
   procedure Extract_Clock (N : Net; Clk : out Net; Enable : out Net)
   is
      Inst : constant Instance := Get_Net_Parent (N);
   begin
      Clk := No_Net;
      Enable := No_Net;

      case Get_Id (Inst) is
         when Edge_Module_Id =>
            Clk := N;
         when Id_And =>
            --  Assume the condition is canonicalized, ie of the form:
            --  CLK and EXPR.
            --  FIXME: do it!
            declare
               I0 : constant Input := Get_Input (Inst, 0);
               I1 : Input;
               Drv : Net;
            begin
               Drv := Get_Driver (I0);
               if Get_Id (Get_Net_Parent (Drv)) in Edge_Module_Id then
                  --  INST is clearly not synthesizable (boolean operation on
                  --  an edge).  Will be removed at the end by
                  --  remove_unused_instances.  Do not remove it now as its
                  --  output may be used by other nets.
                  Clk := Drv;
                  I1 := Get_Input (Inst, 1);
                  Enable := Get_Driver (I1);
               end if;
            end;
         when others =>
            null;
      end case;
   end Extract_Clock;

   function Infere (Ctxt : Context_Acc; Val : Net; Prev_Val : Net) return Net
   is
      pragma Assert (Val /= No_Net);
      pragma Assert (Prev_Val /= No_Net);
      Last_Mux : Instance;
      Len : Integer;
   begin
      Find_Longest_Loop (Val, Prev_Val, Last_Mux, Len);
      if Len < 0 then
         --  No logical loop
         return Val;
      elsif Len = 0 then
         --  Self assignment.
         return Val;
      end if;

      --  Create the array of mux till the last one.
      --  Find the one with clock edge.
      --  If none -> latch (not yet supported)
      --  If found -> previous mux2 (if any) are either asynch set/reset or
      --    enable.
      declare
         Mux_Info : Mux_Info_Arr (1 .. Len);
      begin
         --  Fill array.
         declare
            Mux : Instance;
            O : Net;
         begin
            Mux := Last_Mux;
            for I in reverse Mux_Info'Range loop
               pragma Assert (Get_Id (Mux) = Id_Mux2);
               Mux_Info (I) := (Mux => Mux, Chain => 0);
               exit when I = Mux_Info'First;
               O := Get_Output (Mux, 0);
               pragma Assert (Has_One_Connection (O));
               Mux := Get_Parent (Get_First_Sink (O));
            end loop;
         end;

         --  Classify.
         for I in Mux_Info'Range loop
            declare
               Mi : Mux_Info_Type renames Mux_Info (I);
               Sel : constant Input := Get_Mux2_Sel (Mi.Mux);
               I0 : constant Input := Get_Mux2_I0 (Mi.Mux);
               I1 : constant Input := Get_Mux2_I1 (Mi.Mux);
               Data : Net;
               Clk : Net;
               Enable : Net;
               Res : Net;
               Sig : Instance;
               Init : Net;
               Init_Input : Input;
            begin
               Extract_Clock (Get_Driver (Sel), Clk, Enable);
               if Clk = No_Net then
                  --  Enable or async reset/set.
                  if Get_Driver (I0) = Prev_Val then
                     --  Enable
                     raise Internal_Error;
                  elsif Get_Driver (I1) = Prev_Val then
                     --  /Enable
                     raise Internal_Error;
                  else
                     --  Set or reset.
                     raise Internal_Error;
                  end if;
               else
                  --  Create and return the DFF.
                  Disconnect (Sel);
                  if Get_Driver (I0) /= Prev_Val then
                     --  There must be no 'else' part for clock expression.
                     raise Internal_Error;
                  end if;
                  --  Don't try to free driver of I0 as this is Prev_Val.
                  Disconnect (I0);
                  Data := Get_Driver (I1);
                  --  Don't try to free driver of I1 as it is reconnected.
                  Disconnect (I1);
                  if Enable /= No_Net then
                     Data := Build_Mux2 (Ctxt, Enable, Prev_Val, Data);
                  end if;

                  --  If the signal declaration has an initial value, move it
                  --  to the dff.
                  Sig := Get_Parent (Prev_Val);
                  if Get_Id (Get_Module (Sig)) = Id_Isignal then
                     Init_Input := Get_Input (Sig, 1);
                     Init := Get_Driver (Init_Input);
                     Disconnect (Init_Input);
                  else
                     Init := No_Net;
                  end if;

                  if Init /= No_Net then
                     Res := Build_Idff (Ctxt, Clk, D => Data, Init => Init);
                  else
                     Res := Build_Dff (Ctxt, Clk, D => Data);
                  end if;

                  --  The output of the mux may be read later in the process,
                  --  like this:
                  --    if clk'event and clk = '1' then
                  --       d := i + 1;
                  --    end if;
                  --    d1 := d + 1;
                  --  So connections to the mux output are redirected to dff
                  --  output.
                  Redirect_Inputs (Get_Output (Mi.Mux, 0), Res);

                  Free_Instance (Mi.Mux);
                  return Res;
               end if;
            end;
         end loop;
      end;
      raise Internal_Error;
   end Infere;
end Synth.Inference;
generated by cgit v1.2.3 (git 2.25.1) at 2026-01-09 14:15:29 +0000