diff options
Diffstat (limited to 'src/ortho/mcode/ortho_code-x86-insns.adb')
| -rw-r--r-- | src/ortho/mcode/ortho_code-x86-insns.adb | 2068 |
1 files changed, 2068 insertions, 0 deletions
diff --git a/src/ortho/mcode/ortho_code-x86-insns.adb b/src/ortho/mcode/ortho_code-x86-insns.adb new file mode 100644 index 000000000..c218a9ae0 --- /dev/null +++ b/src/ortho/mcode/ortho_code-x86-insns.adb @@ -0,0 +1,2068 @@ +-- Mcode back-end for ortho - mcode to X86 instructions. +-- Copyright (C) 2006 Tristan Gingold +-- +-- GHDL 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, or (at your option) any later +-- version. +-- +-- GHDL 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 GCC; see the file COPYING. If not, write to the Free +-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA +-- 02111-1307, USA. +with Interfaces; +with Ada.Text_IO; +with Ortho_Code.Abi; +with Ortho_Code.Decls; use Ortho_Code.Decls; +with Ortho_Code.Types; use Ortho_Code.Types; +with Ortho_Code.Debug; +with Ortho_Code.X86.Flags; + +package body Ortho_Code.X86.Insns is + procedure Link_Stmt (Stmt : O_Enode) + is + use Ortho_Code.Abi; + begin + Set_Stmt_Link (Last_Link, Stmt); + Last_Link := Stmt; + if Debug.Flag_Debug_Insn then + Disp_Stmt (Stmt); + end if; + end Link_Stmt; + + function Get_Reg_Any (Mode : Mode_Type) return O_Reg is + begin + case Mode is + when Mode_I16 .. Mode_I32 + | Mode_U16 .. Mode_U32 + | Mode_P32 => + return R_Any32; + when Mode_I8 + | Mode_U8 + | Mode_B2 => + return R_Any8; + when Mode_U64 + | Mode_I64 => + return R_Any64; + when Mode_F32 + | Mode_F64 => + if Abi.Flag_Sse2 then + return R_Any_Xmm; + else + return R_St0; + end if; + when Mode_P64 + | Mode_X1 + | Mode_Nil + | Mode_Blk => + raise Program_Error; + end case; + end Get_Reg_Any; + + function Get_Reg_Any (Stmt : O_Enode) return O_Reg is + begin + return Get_Reg_Any (Get_Expr_Mode (Stmt)); + end Get_Reg_Any; + + -- Stack slot management. + Stack_Offset : Uns32 := 0; + Stack_Max : Uns32 := 0; + + -- Count how many bytes have been pushed on the stack, during a call. This + -- is used to correctly align the stack for nested calls. + Push_Offset : Uns32 := 0; + + -- STMT is an OE_END statement. + -- Swap Stack_Offset with Max_Stack of STMT. + procedure Swap_Stack_Offset (Blk : O_Dnode) + is + Prev_Offset : Uns32; + begin + Prev_Offset := Get_Block_Max_Stack (Blk); + Set_Block_Max_Stack (Blk, Stack_Offset); + Stack_Offset := Prev_Offset; + end Swap_Stack_Offset; + + procedure Expand_Decls (Block : O_Dnode) + is + Last : O_Dnode; + Decl : O_Dnode; + Decl_Type : O_Tnode; + begin + if Get_Decl_Kind (Block) /= OD_Block then + raise Program_Error; + end if; + Last := Get_Block_Last (Block); + Decl := Block + 1; + while Decl <= Last loop + case Get_Decl_Kind (Decl) is + when OD_Local => + Decl_Type := Get_Decl_Type (Decl); + Stack_Offset := Do_Align (Stack_Offset, Decl_Type); + Stack_Offset := Stack_Offset + Get_Type_Size (Decl_Type); + Set_Local_Offset (Decl, -Int32 (Stack_Offset)); + if Stack_Offset > Stack_Max then + Stack_Max := Stack_Offset; + end if; + when OD_Type + | OD_Const + | OD_Const_Val + | OD_Var + | OD_Function + | OD_Procedure + | OD_Interface + | OD_Body + | OD_Subprg_Ext => + null; + when OD_Block => + Decl := Get_Block_Last (Decl); + end case; + Decl := Decl + 1; + end loop; + end Expand_Decls; + + function Ekind_To_Cc (Stmt : O_Enode; Mode : Mode_Type) return O_Reg + is + Kind : OE_Kind; + begin + Kind := Get_Expr_Kind (Stmt); + case Mode is + when Mode_U8 .. Mode_U64 + | Mode_F32 .. Mode_F64 + | Mode_P32 + | Mode_P64 + | Mode_B2 => + return Ekind_Unsigned_To_Cc (Kind); + when Mode_I8 .. Mode_I64 => + return Ekind_Signed_To_Cc (Kind); + when others => + raise Program_Error; + end case; + end Ekind_To_Cc; + + -- CC is the result of A CMP B. + -- Returns the condition for B CMP A. + function Reverse_Cc (Cc : O_Reg) return O_Reg is + begin + case Cc is + when R_Ult => + return R_Ugt; + when R_Uge => + return R_Ule; + when R_Eq => + return R_Eq; + when R_Ne => + return R_Ne; + when R_Ule => + return R_Uge; + when R_Ugt => + return R_Ult; + when R_Slt => + return R_Sgt; + when R_Sge => + return R_Sle; + when R_Sle => + return R_Sge; + when R_Sgt => + return R_Slt; + when others => + raise Program_Error; + end case; + end Reverse_Cc; + + -- Get the register in which a result of MODE is returned. + function Get_Call_Register (Mode : Mode_Type) return O_Reg is + begin + case Mode is + when Mode_U8 .. Mode_U32 + | Mode_I8 .. Mode_I32 + | Mode_P32 + | Mode_B2 => + return R_Ax; + when Mode_U64 + | Mode_I64 => + return R_Edx_Eax; + when Mode_F32 + | Mode_F64 => + if Abi.Flag_Sse2 and True then + -- Note: this shouldn't be enabled as the svr4 ABI specifies + -- ST0. + return R_Xmm0; + else + return R_St0; + end if; + when Mode_Nil => + return R_None; + when Mode_X1 + | Mode_Blk + | Mode_P64 => + raise Program_Error; + end case; + end Get_Call_Register; + +-- function Ensure_Rm (Stmt : O_Enode) return O_Enode +-- is +-- begin +-- case Get_Expr_Reg (Stmt) is +-- when R_Mem +-- | Regs_Any32 => +-- return Stmt; +-- when others => +-- raise Program_Error; +-- end case; +-- end Ensure_Rm; + +-- function Ensure_Ireg (Stmt : O_Enode) return O_Enode +-- is +-- Reg : O_Reg; +-- begin +-- Reg := Get_Expr_Reg (Stmt); +-- case Reg is +-- when Regs_Any32 +-- | R_Imm => +-- return Stmt; +-- when others => +-- raise Program_Error; +-- end case; +-- end Ensure_Ireg; + + function Insert_Move (Expr : O_Enode; Dest : O_Reg) return O_Enode + is + N : O_Enode; + begin + N := New_Enode (OE_Move, Get_Expr_Mode (Expr), O_Tnode_Null, + Expr, O_Enode_Null); + Set_Expr_Reg (N, Dest); + Link_Stmt (N); + return N; + end Insert_Move; + +-- function Insert_Spill (Expr : O_Enode) return O_Enode +-- is +-- N : O_Enode; +-- begin +-- N := New_Enode (OE_Spill, Get_Expr_Mode (Expr), O_Tnode_Null, +-- Expr, O_Enode_Null); +-- Set_Expr_Reg (N, R_Spill); +-- Link_Stmt (N); +-- return N; +-- end Insert_Spill; + + procedure Error_Gen_Insn (Stmt : O_Enode; Reg : O_Reg) + is + use Ada.Text_IO; + begin + Put_Line ("gen_insn error: cannot match reg " & Abi.Image_Reg (Reg) + & " with stmt " & OE_Kind'Image (Get_Expr_Kind (Stmt))); + raise Program_Error; + end Error_Gen_Insn; + + procedure Error_Gen_Insn (Stmt : O_Enode; Mode : Mode_Type) + is + use Ada.Text_IO; + begin + Put_Line ("gen_insn error: cannot match mode " & Mode_Type'Image (Mode) + & " with stmt " & OE_Kind'Image (Get_Expr_Kind (Stmt)) + & " of mode " & Mode_Type'Image (Get_Expr_Mode (Stmt))); + raise Program_Error; + end Error_Gen_Insn; + + pragma No_Return (Error_Gen_Insn); + + Cur_Block : O_Enode; + + type O_Inum is new Int32; + O_Free : constant O_Inum := 0; + O_Iroot : constant O_Inum := 1; + + + Insn_Num : O_Inum; + + function Get_Insn_Num return O_Inum is + begin + Insn_Num := Insn_Num + 1; + return Insn_Num; + end Get_Insn_Num; + + + type Reg_Info_Type is record + -- Statement number which use this register. + -- This is a distance. + Num : O_Inum; + + -- Statement which produces this value. + -- Used to have more info on this register (such as mode to allocate + -- a spill location). + Stmt : O_Enode; + + -- If set, this register has been used. + -- All callee-saved registers marked must be saved. + Used : Boolean; + end record; + + Init_Reg_Info : constant Reg_Info_Type := (Num => O_Free, + Stmt => O_Enode_Null, + Used => False); + type Reg32_Info_Array is array (Regs_R32) of Reg_Info_Type; + Regs : Reg32_Info_Array := (others => Init_Reg_Info); + + Reg_Cc : Reg_Info_Type := Init_Reg_Info; + + type Fp_Stack_Type is mod 8; + type RegFp_Info_Array is array (Fp_Stack_Type) of Reg_Info_Type; + Fp_Top : Fp_Stack_Type := 0; + Fp_Regs : RegFp_Info_Array; + + type Reg_Xmm_Info_Array is array (Regs_Xmm) of Reg_Info_Type; + Info_Regs_Xmm : Reg_Xmm_Info_Array := (others => Init_Reg_Info); + + function Reg_Used (Reg : Regs_R32) return Boolean is + begin + return Regs (Reg).Used; + end Reg_Used; + + procedure Dump_Reg32_Info (Reg : Regs_R32) + is + use Ada.Text_IO; + use Ortho_Code.Debug.Int32_IO; + use Abi; + begin + Put (Image_Reg (Reg)); + Put (": "); + Put (Int32 (Regs (Reg).Stmt), 0); + Put (", num: "); + Put (Int32 (Regs (Reg).Num), 0); + --Put (", twin: "); + --Put (Image_Reg (Regs (Reg).Twin_Reg)); + --Put (", link: "); + --Put (Image_Reg (Regs (Reg).Link)); + New_Line; + end Dump_Reg32_Info; + + procedure Dump_Regs + is + use Ada.Text_IO; + use Debug.Int32_IO; + begin +-- Put ("free_regs: "); +-- Put (Image_Reg (Free_Regs)); +-- Put (", to_free_regs: "); +-- Put (Image_Reg (To_Free_Regs)); +-- New_Line; + + for I in Regs_R32 loop + Dump_Reg32_Info (I); + end loop; + for I in Fp_Stack_Type loop + Put ("fp" & Fp_Stack_Type'Image (I)); + Put (": "); + Put (Int32 (Fp_Regs (I).Stmt), 0); + New_Line; + end loop; + end Dump_Regs; + + pragma Unreferenced (Dump_Regs); + + procedure Error_Reg (Msg : String; Stmt : O_Enode; Reg : O_Reg) + is + use Ada.Text_IO; + use Ortho_Code.Debug.Int32_IO; + begin + Put ("error reg: "); + Put (Msg); + New_Line; + Put (" stmt: "); + Put (Int32 (Stmt), 0); + Put (", reg: "); + Put (Abi.Image_Reg (Reg)); + New_Line; + --Dump_Regs; + raise Program_Error; + end Error_Reg; + pragma No_Return (Error_Reg); + + -- Free_XX + -- Mark a register as unused. + procedure Free_R32 (Reg : O_Reg) is + begin + if Regs (Reg).Num = O_Free then + raise Program_Error; + end if; + Regs (Reg).Num := O_Free; + end Free_R32; + + procedure Free_Fp is + begin + if Fp_Regs (Fp_Top).Stmt = O_Enode_Null then + raise Program_Error; + end if; + Fp_Regs (Fp_Top).Stmt := O_Enode_Null; + Fp_Top := Fp_Top + 1; + end Free_Fp; + + procedure Free_Cc is + begin + if Reg_Cc.Num = O_Free then + raise Program_Error; + end if; + Reg_Cc.Num := O_Free; + end Free_Cc; + + procedure Free_Xmm (Reg : O_Reg) is + begin + if Info_Regs_Xmm (Reg).Num = O_Free then + raise Program_Error; + end if; + Info_Regs_Xmm (Reg).Num := O_Free; + end Free_Xmm; + + -- Allocate a stack slot for spilling. + procedure Alloc_Spill (N : O_Enode) + is + Mode : Mode_Type; + begin + Mode := Get_Expr_Mode (N); + -- Allocate on the stack. + Stack_Offset := Types.Do_Align (Stack_Offset, Mode); + Stack_Offset := Stack_Offset + Types.Get_Mode_Size (Mode); + if Stack_Offset > Stack_Max then + Stack_Max := Stack_Offset; + end if; + Set_Spill_Info (N, -Int32 (Stack_Offset)); + end Alloc_Spill; + + -- Insert a spill statement after ORIG: will save register(s) allocated by + -- ORIG. + -- Return the register(s) spilt (There might be several registers if + -- ORIG uses a R64 register). + function Insert_Spill (Orig : O_Enode) return O_Reg + is + N : O_Enode; + Mode : Mode_Type; + Reg_Orig : O_Reg; + begin + -- Add a spill statement. + Mode := Get_Expr_Mode (Orig); + N := New_Enode (OE_Spill, Mode, O_Tnode_Null, Orig, O_Enode_Null); + Alloc_Spill (N); + + -- Insert the statement after the one that set the register + -- being spilled. + -- That's very important to be able to easily find the spill location, + -- when it will be reloaded. + if Orig = Abi.Last_Link then + Link_Stmt (N); + else + Set_Stmt_Link (N, Get_Stmt_Link (Orig)); + Set_Stmt_Link (Orig, N); + end if; + Reg_Orig := Get_Expr_Reg (Orig); + Set_Expr_Reg (N, Reg_Orig); + Set_Expr_Reg (Orig, R_Spill); + return Reg_Orig; + end Insert_Spill; + + procedure Spill_R32 (Reg : Regs_R32) + is + Reg_Orig : O_Reg; + begin + if Regs (Reg).Num = O_Free then + -- This register was not allocated. + raise Program_Error; + end if; + + Reg_Orig := Insert_Spill (Regs (Reg).Stmt); + + -- Free the register. + case Reg_Orig is + when Regs_R32 => + if Reg_Orig /= Reg then + raise Program_Error; + end if; + Free_R32 (Reg); + when Regs_R64 => + Free_R32 (Get_R64_High (Reg_Orig)); + Free_R32 (Get_R64_Low (Reg_Orig)); + when others => + raise Program_Error; + end case; + end Spill_R32; + + procedure Alloc_R32 (Reg : O_Reg; Stmt : O_Enode; Num : O_Inum) is + begin + if Regs (Reg).Num /= O_Free then + Spill_R32 (Reg); + end if; + Regs (Reg) := (Num => Num, Stmt => Stmt, Used => True); + end Alloc_R32; + + procedure Clobber_R32 (Reg : O_Reg) is + begin + if Regs (Reg).Num /= O_Free then + Spill_R32 (Reg); + end if; + end Clobber_R32; + + procedure Alloc_Fp (Stmt : O_Enode) + is + begin + Fp_Top := Fp_Top - 1; + + if Fp_Regs (Fp_Top).Stmt /= O_Enode_Null then + -- Must spill-out. + raise Program_Error; + end if; + Fp_Regs (Fp_Top).Stmt := Stmt; + end Alloc_Fp; + + procedure Alloc_R64 (Reg : O_Reg; Stmt : O_Enode; Num : O_Inum) + is + Rh, Rl : O_Reg; + begin + Rl := Get_R64_Low (Reg); + Rh := Get_R64_High (Reg); + if Regs (Rl).Num /= O_Free + or Regs (Rh).Num /= O_Free + then + Spill_R32 (Rl); + end if; + Regs (Rh) := (Num => Num, Stmt => Stmt, Used => True); + Regs (Rl) := (Num => Num, Stmt => Stmt, Used => True); + end Alloc_R64; + + procedure Alloc_Cc (Stmt : O_Enode; Num : O_Inum) is + begin + if Reg_Cc.Num /= O_Free then + raise Program_Error; + end if; + Reg_Cc := (Num => Num, Stmt => Stmt, Used => True); + end Alloc_Cc; + + procedure Spill_Xmm (Reg : Regs_Xmm) + is + Reg_Orig : O_Reg; + begin + if Info_Regs_Xmm (Reg).Num = O_Free then + -- This register was not allocated. + raise Program_Error; + end if; + + Reg_Orig := Insert_Spill (Info_Regs_Xmm (Reg).Stmt); + + -- Free the register. + if Reg_Orig /= Reg then + raise Program_Error; + end if; + Free_Xmm (Reg); + end Spill_Xmm; + + procedure Alloc_Xmm (Reg : Regs_Xmm; Stmt : O_Enode; Num : O_Inum) is + begin + if Info_Regs_Xmm (Reg).Num /= O_Free then + Spill_Xmm (Reg); + end if; + Info_Regs_Xmm (Reg) := (Num => Num, Stmt => Stmt, Used => True); + end Alloc_Xmm; + + procedure Clobber_Xmm (Reg : Regs_Xmm) is + begin + if Info_Regs_Xmm (Reg).Num /= O_Free then + Spill_Xmm (Reg); + end if; + end Clobber_Xmm; + pragma Unreferenced (Clobber_Xmm); + + function Alloc_Reg (Reg : O_Reg; Stmt : O_Enode; Num : O_Inum) return O_Reg + is + Best_Reg : O_Reg; + Best_Num : O_Inum; + begin + case Reg is + when Regs_R32 => + Alloc_R32 (Reg, Stmt, Num); + return Reg; + when Regs_R64 => + Alloc_R64 (Reg, Stmt, Num); + return Reg; + when R_St0 => + Alloc_Fp (Stmt); + return Reg; + when Regs_Xmm => + Alloc_Xmm (Reg, Stmt, Num); + return Reg; + when R_Any32 => + Best_Num := O_Inum'Last; + Best_Reg := R_None; + for I in Regs_R32 loop + if I not in R_Sp .. R_Bp then + if Regs (I).Num = O_Free then + Alloc_R32 (I, Stmt, Num); + return I; + elsif Regs (I).Num <= Best_Num then + Best_Reg := I; + Best_Num := Regs (I).Num; + end if; + end if; + end loop; + Alloc_R32 (Best_Reg, Stmt, Num); + return Best_Reg; + when R_Any8 => + Best_Num := O_Inum'Last; + Best_Reg := R_None; + for I in Regs_R8 loop + if Regs (I).Num = O_Free then + Alloc_R32 (I, Stmt, Num); + return I; + elsif Regs (I).Num <= Best_Num then + Best_Reg := I; + Best_Num := Regs (I).Num; + end if; + end loop; + Alloc_R32 (Best_Reg, Stmt, Num); + return Best_Reg; + when R_Any64 => + declare + Rh, Rl : O_Reg; + begin + Best_Num := O_Inum'Last; + Best_Reg := R_None; + for I in Regs_R64 loop + Rh := Get_R64_High (I); + Rl := Get_R64_Low (I); + if Regs (Rh).Num = O_Free + and then Regs (Rl).Num = O_Free + then + Alloc_R64 (I, Stmt, Num); + return I; + elsif Regs (Rh).Num <= Best_Num + and Regs (Rl).Num <= Best_Num + then + Best_Reg := I; + Best_Num := O_Inum'Max (Regs (Rh).Num, + Regs (Rl).Num); + end if; + end loop; + Alloc_R64 (Best_Reg, Stmt, Num); + return Best_Reg; + end; + when R_Any_Xmm => + Best_Num := O_Inum'Last; + Best_Reg := R_None; + for I in Regs_X86_Xmm loop + if Info_Regs_Xmm (I).Num = O_Free then + Alloc_Xmm (I, Stmt, Num); + return I; + elsif Info_Regs_Xmm (I).Num <= Best_Num then + Best_Reg := I; + Best_Num := Info_Regs_Xmm (I).Num; + end if; + end loop; + Alloc_Xmm (Best_Reg, Stmt, Num); + return Best_Reg; + when others => + Error_Reg ("alloc_reg: unknown reg", O_Enode_Null, Reg); + raise Program_Error; + end case; + end Alloc_Reg; + + function Gen_Reload (Spill : O_Enode; Reg : O_Reg; Num : O_Inum) + return O_Enode + is + N : O_Enode; + Mode : Mode_Type; + begin + -- Add a reload node. + Mode := Get_Expr_Mode (Spill); + N := New_Enode (OE_Reload, Mode, O_Tnode_Null, Spill, O_Enode_Null); + -- Note: this does not use a just-freed register, since + -- this case only occurs at the first call. + Set_Expr_Reg (N, Alloc_Reg (Reg, N, Num)); + Link_Stmt (N); + return N; + end Gen_Reload; + + function Reload (Expr : O_Enode; Dest : O_Reg; Num : O_Inum) return O_Enode + is + Reg : O_Reg; + Spill : O_Enode; + begin + Reg := Get_Expr_Reg (Expr); + case Reg is + when R_Spill => + -- Restore the register between the statement and the spill. + Spill := Get_Stmt_Link (Expr); + Set_Expr_Reg (Expr, Get_Expr_Reg (Spill)); + Set_Expr_Reg (Spill, R_Spill); + case Dest is + when R_Mem + | R_Irm + | R_Rm => + return Spill; + when Regs_R32 + | R_Any32 + | Regs_R64 + | R_Any64 + | R_Any8 => + return Gen_Reload (Spill, Dest, Num); + when R_Sib => + return Gen_Reload (Spill, R_Any32, Num); + when R_Ir => + return Gen_Reload (Spill, Get_Reg_Any (Expr), Num); + when others => + Error_Reg ("reload: unhandled dest in spill", Expr, Dest); + end case; + when Regs_R32 => + case Dest is + when R_Irm + | R_Rm + | R_Ir + | R_Any32 + | R_Any8 + | R_Sib => + return Expr; + when Regs_R32 => + if Dest = Reg then + return Expr; + end if; + Free_R32 (Reg); + Spill := Insert_Move (Expr, Dest); + Alloc_R32 (Dest, Spill, Num); + return Spill; + when others => + Error_Reg ("reload: unhandled dest in R32", Expr, Dest); + end case; + when Regs_R64 => + return Expr; + when R_St0 => + return Expr; + when Regs_Xmm => + return Expr; + when R_Mem => + if Get_Expr_Kind (Expr) = OE_Indir then + Set_Expr_Operand (Expr, + Reload (Get_Expr_Operand (Expr), R_Sib, Num)); + return Expr; + else + raise Program_Error; + end if; + when R_B_Off + | R_B_I + | R_I_Off + | R_Sib => + case Get_Expr_Kind (Expr) is + when OE_Add => + Set_Expr_Left + (Expr, Reload (Get_Expr_Left (Expr), R_Any32, Num)); + Set_Expr_Right + (Expr, Reload (Get_Expr_Right (Expr), R_Any32, Num)); + return Expr; + when OE_Addrl => + Spill := Get_Addrl_Frame (Expr); + if Spill /= O_Enode_Null then + Set_Addrl_Frame (Expr, Reload (Spill, R_Any32, Num)); + end if; + return Expr; + when others => + Error_Reg ("reload: unhandle expr in b_off", Expr, Dest); + end case; + when R_I => + Set_Expr_Left (Expr, Reload (Get_Expr_Left (Expr), R_Any32, Num)); + return Expr; + when R_Imm => + return Expr; + when others => + Error_Reg ("reload: unhandled reg", Expr, Reg); + end case; + end Reload; + + procedure Renum_Reg (Reg : O_Reg; Stmt : O_Enode; Num : O_Inum) is + begin + case Reg is + when Regs_R32 => + Regs (Reg).Num := Num; + Regs (Reg).Stmt := Stmt; + when Regs_Cc => + Reg_Cc.Num := Num; + Reg_Cc.Stmt := Stmt; + when R_St0 => + null; + when Regs_R64 => + declare + L, H : O_Reg; + begin + L := Get_R64_Low (Reg); + Regs (L).Num := Num; + Regs (L).Stmt := Stmt; + H := Get_R64_High (Reg); + Regs (H).Num := Num; + Regs (H).Stmt := Stmt; + end; + when others => + Error_Reg ("renum_reg", Stmt, Reg); + end case; + end Renum_Reg; + + procedure Free_Insn_Regs (Insn : O_Enode) + is + R : O_Reg; + begin + R := Get_Expr_Reg (Insn); + case R is + when R_Ax + | R_Bx + | R_Cx + | R_Dx + | R_Si + | R_Di => + Free_R32 (R); + when R_Sp + | R_Bp => + null; + when R_St0 => + Free_Fp; + when Regs_Xmm => + Free_Xmm (R); + when Regs_R64 => + Free_R32 (Get_R64_High (R)); + Free_R32 (Get_R64_Low (R)); + when R_Mem => + if Get_Expr_Kind (Insn) = OE_Indir then + Free_Insn_Regs (Get_Expr_Operand (Insn)); + else + raise Program_Error; + end if; + when R_B_Off + | R_B_I + | R_I_Off + | R_Sib => + case Get_Expr_Kind (Insn) is + when OE_Add => + Free_Insn_Regs (Get_Expr_Left (Insn)); + Free_Insn_Regs (Get_Expr_Right (Insn)); + when OE_Addrl => + if Get_Addrl_Frame (Insn) /= O_Enode_Null then + Free_Insn_Regs (Get_Addrl_Frame (Insn)); + end if; + when others => + raise Program_Error; + end case; + when R_I => + Free_Insn_Regs (Get_Expr_Left (Insn)); + when R_Imm => + null; + when R_Spill => + null; + when others => + Error_Reg ("free_insn_regs: unknown reg", Insn, R); + end case; + end Free_Insn_Regs; + + procedure Insert_Reg (Mode : Mode_Type) + is + N : O_Enode; + Num : O_Inum; + begin + Num := Get_Insn_Num; + N := New_Enode (OE_Reg, Mode, O_Tnode_Null, + O_Enode_Null, O_Enode_Null); + Set_Expr_Reg (N, Alloc_Reg (Get_Reg_Any (Mode), N, Num)); + Link_Stmt (N); + Free_Insn_Regs (N); + end Insert_Reg; + + procedure Insert_Arg (Expr : O_Enode) + is + N : O_Enode; + begin + Free_Insn_Regs (Expr); + N := New_Enode (OE_Arg, Get_Expr_Mode (Expr), O_Tnode_Null, + Expr, O_Enode_Null); + Set_Expr_Reg (N, R_None); + Link_Stmt (N); + end Insert_Arg; + + function Insert_Intrinsic (Stmt : O_Enode; Reg : O_Reg; Num : O_Inum) + return O_Enode + is + N : O_Enode; + Op : Int32; + Mode : Mode_Type; + begin + Mode := Get_Expr_Mode (Stmt); + case Get_Expr_Kind (Stmt) is + when OE_Mul_Ov => + case Mode is + when Mode_U64 => + Op := Intrinsic_Mul_Ov_U64; + when Mode_I64 => + Op := Intrinsic_Mul_Ov_I64; + when others => + raise Program_Error; + end case; + when OE_Div_Ov => + case Mode is + when Mode_U64 => + Op := Intrinsic_Div_Ov_U64; + when Mode_I64 => + Op := Intrinsic_Div_Ov_I64; + when others => + raise Program_Error; + end case; + when OE_Mod => + case Mode is + when Mode_U64 => + Op := Intrinsic_Mod_Ov_U64; + when Mode_I64 => + Op := Intrinsic_Mod_Ov_I64; + when others => + raise Program_Error; + end case; + when OE_Rem => + case Mode is + when Mode_U64 => + -- For unsigned, MOD == REM. + Op := Intrinsic_Mod_Ov_U64; + when Mode_I64 => + Op := Intrinsic_Rem_Ov_I64; + when others => + raise Program_Error; + end case; + when others => + raise Program_Error; + end case; + + -- Save caller-saved registers. + Clobber_R32 (R_Ax); + Clobber_R32 (R_Dx); + Clobber_R32 (R_Cx); + + N := New_Enode (OE_Intrinsic, Mode, O_Tnode_Null, + O_Enode (Op), O_Enode_Null); + Set_Expr_Reg (N, Alloc_Reg (Reg, N, Num)); + Link_Stmt (N); + return N; + end Insert_Intrinsic; + + -- REG is mandatory: the result of STMT must satisfy the REG constraint. + function Gen_Insn (Stmt : O_Enode; Reg : O_Reg; Pnum : O_Inum) + return O_Enode; + + function Gen_Conv_From_Fp_Insn (Stmt : O_Enode; + Reg : O_Reg; + Pnum : O_Inum) + return O_Enode + is + Num : O_Inum; + Left : O_Enode; + begin + Left := Get_Expr_Operand (Stmt); + Num := Get_Insn_Num; + Left := Gen_Insn (Left, R_St0, Num); + Free_Insn_Regs (Left); + Set_Expr_Operand (Stmt, Left); + case Reg is + when Regs_R32 + | R_Any32 + | Regs_R64 + | R_Any64 => + Set_Expr_Reg (Stmt, Alloc_Reg (Reg, Stmt, Pnum)); + when R_Rm + | R_Irm + | R_Ir => + Set_Expr_Reg (Stmt, Alloc_Reg (Get_Reg_Any (Stmt), Stmt, Pnum)); + when others => + raise Program_Error; + end case; + Link_Stmt (Stmt); + return Stmt; +-- declare +-- Spill : O_Enode; +-- begin +-- Num := Get_Insn_Num; +-- Left := Gen_Insn (Left, R_St0, Num); +-- Set_Expr_Operand (Stmt, Left); +-- Set_Expr_Reg (Stmt, R_Spill); +-- Free_Insn_Regs (Left); +-- Link_Stmt (Stmt); +-- Spill := Insert_Spill (Stmt); +-- case Reg is +-- when R_Any32 +-- | Regs_R32 => +-- return Gen_Reload (Spill, Reg, Pnum); +-- when R_Ir => +-- return Gen_Reload (Spill, R_Any32, Pnum); +-- when R_Rm +-- | R_Irm => +-- return Spill; +-- when others => +-- Error_Reg +-- ("gen_insn:oe_conv(fp)", Stmt, Reg); +-- end case; +-- end; + end Gen_Conv_From_Fp_Insn; + + function Gen_Call (Stmt : O_Enode; Reg : O_Reg; Pnum : O_Inum) + return O_Enode + is + use Interfaces; + Left : O_Enode; + Reg_Res : O_Reg; + Subprg : O_Dnode; + Push_Size : Uns32; + Pad : Uns32; + Res_Stmt : O_Enode; + begin + -- Emit Setup_Frame (to align stack). + Subprg := Get_Call_Subprg (Stmt); + Push_Size := Uns32 (Get_Subprg_Stack (Subprg)); + -- Pad the stack if necessary. + Pad := (Push_Size + Push_Offset) and Uns32 (Flags.Stack_Boundary - 1); + if Pad /= 0 then + Pad := Uns32 (Flags.Stack_Boundary) - Pad; + Link_Stmt (New_Enode (OE_Stack_Adjust, Mode_Nil, O_Tnode_Null, + O_Enode (Pad), O_Enode_Null)); + end if; + -- The stack has been adjusted by Pad bytes. + Push_Offset := Push_Offset + Pad; + + -- Generate code for arguments (if any). + Left := Get_Arg_Link (Stmt); + if Left /= O_Enode_Null then + Left := Gen_Insn (Left, R_None, Pnum); + end if; + + -- Clobber registers. + Clobber_R32 (R_Ax); + Clobber_R32 (R_Dx); + Clobber_R32 (R_Cx); + -- FIXME: fp regs. + + -- Add the call. + Reg_Res := Get_Call_Register (Get_Expr_Mode (Stmt)); + Set_Expr_Reg (Stmt, Reg_Res); + Link_Stmt (Stmt); + Res_Stmt := Stmt; + + if Push_Size + Pad /= 0 then + Res_Stmt := + New_Enode (OE_Stack_Adjust, Get_Expr_Mode (Stmt), O_Tnode_Null, + O_Enode (-Int32 (Push_Size + Pad)), O_Enode_Null); + Set_Expr_Reg (Res_Stmt, Reg_Res); + Link_Stmt (Res_Stmt); + end if; + + -- The stack has been restored (just after the call). + Push_Offset := Push_Offset - (Push_Size + Pad); + + case Reg is + when R_Any32 + | R_Any64 + | R_Any8 + | R_Irm + | R_Rm + | R_Ir + | R_Sib + | R_Ax + | R_St0 + | R_Edx_Eax => + Reg_Res := Alloc_Reg (Reg_Res, Res_Stmt, Pnum); + return Res_Stmt; + when R_Any_Cc => + -- Move to register. + -- (use the 'test' instruction). + Alloc_Cc (Res_Stmt, Pnum); + return Insert_Move (Res_Stmt, R_Ne); + when R_None => + if Reg_Res /= R_None then + raise Program_Error; + end if; + return Res_Stmt; + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + end Gen_Call; + + function Gen_Insn (Stmt : O_Enode; Reg : O_Reg; Pnum : O_Inum) + return O_Enode + is + Kind : OE_Kind; + + Left : O_Enode; + Right : O_Enode; + + Reg1 : O_Reg; + -- P_Reg : O_Reg; + Reg_L : O_Reg; + Reg_Res : O_Reg; + + Num : O_Inum; + begin + Kind := Get_Expr_Kind (Stmt); + case Kind is + when OE_Addrl => + Right := Get_Addrl_Frame (Stmt); + if Right /= O_Enode_Null then + Num := Get_Insn_Num; + Right := Gen_Insn (Right, R_Any32, Num); + Set_Addrl_Frame (Stmt, Right); + else + Num := O_Free; + end if; + case Reg is + when R_Sib => + Set_Expr_Reg (Stmt, R_B_Off); + return Stmt; + when R_Irm + | R_Ir => + if Right /= O_Enode_Null then + Free_Insn_Regs (Right); + end if; + Set_Expr_Reg (Stmt, Alloc_Reg (R_Any32, Stmt, Pnum)); + Link_Stmt (Stmt); + return Stmt; + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + when OE_Addrg => + case Reg is + when R_Sib + | R_Irm + | R_Ir => + Set_Expr_Reg (Stmt, R_Imm); + return Stmt; + when R_Any32 + | Regs_R32 => + Set_Expr_Reg (Stmt, Reg); + Link_Stmt (Stmt); + return Stmt; + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + when OE_Indir => + Left := Get_Expr_Operand (Stmt); + case Reg is + when R_Irm + | R_Rm => + Left := Gen_Insn (Left, R_Sib, Pnum); + Set_Expr_Reg (Stmt, R_Mem); + Set_Expr_Operand (Stmt, Left); + when R_Ir + | R_Sib + | R_I_Off => + Num := Get_Insn_Num; + Left := Gen_Insn (Left, R_Sib, Num); + Reg1 := Get_Reg_Any (Stmt); + if Reg1 = R_Any64 then + Reg1 := Alloc_Reg (Reg1, Stmt, Pnum); + Free_Insn_Regs (Left); + else + Free_Insn_Regs (Left); + Reg1 := Alloc_Reg (Reg1, Stmt, Pnum); + end if; + Set_Expr_Reg (Stmt, Reg1); + Set_Expr_Operand (Stmt, Left); + Link_Stmt (Stmt); + when Regs_R32 + | R_Any32 + | R_Any8 + | Regs_Fp => + Num := Get_Insn_Num; + Left := Gen_Insn (Left, R_Sib, Num); + Free_Insn_Regs (Left); + Set_Expr_Reg (Stmt, Alloc_Reg (Reg, Stmt, Pnum)); + Set_Expr_Operand (Stmt, Left); + Link_Stmt (Stmt); + when Regs_R64 + | R_Any64 => + -- Avoid overwritting: + -- Eg: axdx = indir (ax) + -- axdx = indir (ax+dx) + Num := Get_Insn_Num; + Left := Gen_Insn (Left, R_Sib, Num); + Set_Expr_Reg (Stmt, Alloc_Reg (Reg, Stmt, Pnum)); + Left := Reload (Left, R_Sib, Num); + Free_Insn_Regs (Left); + Set_Expr_Operand (Stmt, Left); + Link_Stmt (Stmt); + when R_Any_Cc => + Num := Get_Insn_Num; + Left := Gen_Insn (Left, R_Sib, Num); + -- Generate a cmp $1, XX + Set_Expr_Reg (Stmt, R_Eq); + Set_Expr_Operand (Stmt, Left); + Free_Insn_Regs (Left); + Link_Stmt (Stmt); + Alloc_Cc (Stmt, Pnum); + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + return Stmt; + when OE_Conv_Ptr => + -- Delete nops. + return Gen_Insn (Get_Expr_Operand (Stmt), Reg, Pnum); + when OE_Const => + case Get_Expr_Mode (Stmt) is + when Mode_U8 .. Mode_U32 + | Mode_I8 .. Mode_I32 + | Mode_P32 + | Mode_B2 => + case Reg is + when R_Imm + | Regs_Imm32 => + Set_Expr_Reg (Stmt, R_Imm); + when Regs_R32 + | R_Any32 + | R_Any8 => + Set_Expr_Reg (Stmt, Alloc_Reg (Reg, Stmt, Pnum)); + Link_Stmt (Stmt); + when R_Rm => + Set_Expr_Reg + (Stmt, Alloc_Reg (Get_Reg_Any (Stmt), Stmt, Pnum)); + Link_Stmt (Stmt); + when R_Any_Cc => + Num := Get_Insn_Num; + Set_Expr_Reg (Stmt, Alloc_Reg (R_Any8, Stmt, Num)); + Link_Stmt (Stmt); + Free_Insn_Regs (Stmt); + Right := Insert_Move (Stmt, R_Ne); + Alloc_Cc (Right, Pnum); + return Right; + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + when Mode_F32 + | Mode_F64 => + case Reg is + when R_Ir + | R_Irm + | R_Rm + | R_St0 => + Num := Get_Insn_Num; + if Reg = R_St0 or not Abi.Flag_Sse2 then + Reg1 := R_St0; + else + Reg1 := R_Any_Xmm; + end if; + Set_Expr_Reg (Stmt, Alloc_Reg (Reg1, Stmt, Num)); + Link_Stmt (Stmt); + when others => + raise Program_Error; + end case; + when Mode_U64 + | Mode_I64 => + case Reg is + when R_Irm + | R_Ir + | R_Rm => + Set_Expr_Reg (Stmt, R_Imm); + when R_Mem => + Set_Expr_Reg (Stmt, R_Mem); + when Regs_R64 + | R_Any64 => + Set_Expr_Reg (Stmt, Alloc_Reg (Reg, Stmt, Pnum)); + Link_Stmt (Stmt); + when others => + raise Program_Error; + end case; + when others => + raise Program_Error; + end case; + return Stmt; + when OE_Alloca => + -- Roughly speaking, emited code is: (MASK is a constant). + -- VAL := (VAL + MASK) & ~MASK + -- SP := SP - VAL + -- res <- SP + Left := Get_Expr_Operand (Stmt); + case Reg is + when R_Ir + | R_Irm + | R_Any32 => + Num := Get_Insn_Num; + if X86.Flags.Flag_Alloca_Call then + Reg_L := R_Ax; + else + Reg_L := R_Any32; + end if; + Left := Gen_Insn (Left, Reg_L, Num); + Set_Expr_Operand (Stmt, Left); + Link_Stmt (Left); + Free_Insn_Regs (Left); + Set_Expr_Reg (Stmt, Alloc_Reg (Reg_L, Stmt, Pnum)); + Link_Stmt (Stmt); + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + return Stmt; + + when OE_Kind_Cmp => + -- Return LEFT cmp RIGHT, ie compute RIGHT - LEFT + Num := Get_Insn_Num; + Left := Get_Expr_Left (Stmt); + Reg_L := Get_Reg_Any (Left); + Left := Gen_Insn (Left, Reg_L, Num); + + Right := Get_Expr_Right (Stmt); + case Get_Expr_Mode (Right) is + when Mode_F32 + | Mode_F64 => + Reg1 := R_St0; + when others => + Reg1 := R_Irm; + end case; + Right := Gen_Insn (Right, Reg1, Num); + + -- FIXME: what about if right was spilled out of FP regs ? + -- (it is reloaded in reverse). + Left := Reload (Left, Reg_L, Num); + + Set_Expr_Right (Stmt, Right); + Set_Expr_Left (Stmt, Left); + + Link_Stmt (Stmt); + + Reg_Res := Ekind_To_Cc (Stmt, Get_Expr_Mode (Left)); + case Get_Expr_Mode (Left) is + when Mode_F32 + | Mode_F64 => + Reg_Res := Reverse_Cc (Reg_Res); + when Mode_I64 => + -- I64 is a little bit special... + Reg_Res := Get_R64_High (Get_Expr_Reg (Left)); + if Reg_Res not in Regs_R8 then + Reg_Res := R_Nil; + for I in Regs_R8 loop + if Regs (I).Num = O_Free then + Reg_Res := I; + exit; + end if; + end loop; + if Reg_Res = R_Nil then + -- FIXME: to be handled. + -- Can this happen ? + raise Program_Error; + end if; + end if; + + Free_Insn_Regs (Left); + Free_Insn_Regs (Right); + + Set_Expr_Reg (Stmt, Reg_Res); + case Reg is + when R_Any_Cc => + Right := Insert_Move (Stmt, R_Ne); + Alloc_Cc (Right, Pnum); + return Right; + when R_Any8 + | Regs_R8 + | R_Irm + | R_Ir + | R_Rm => + Reg_Res := Alloc_Reg (Reg_Res, Stmt, Pnum); + return Stmt; + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + when others => + null; + end case; + Set_Expr_Reg (Stmt, Reg_Res); + + Free_Insn_Regs (Left); + Free_Insn_Regs (Right); + + case Reg is + when R_Any_Cc => + Alloc_Cc (Stmt, Pnum); + return Stmt; + when R_Any8 + | Regs_R8 => + Reg_Res := Alloc_Reg (Reg, Stmt, Pnum); + return Insert_Move (Stmt, Reg_Res); + when R_Irm + | R_Ir + | R_Rm => + Reg_Res := Alloc_Reg (R_Any8, Stmt, Pnum); + return Insert_Move (Stmt, Reg_Res); + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + when OE_Add => + declare + R_L : O_Reg; + R_R : O_Reg; + begin + Left := Gen_Insn (Get_Expr_Left (Stmt), R_Sib, Pnum); + Right := Gen_Insn (Get_Expr_Right (Stmt), R_Sib, Pnum); + Left := Reload (Left, R_Sib, Pnum); + Set_Expr_Right (Stmt, Right); + Set_Expr_Left (Stmt, Left); + R_L := Get_Expr_Reg (Left); + R_R := Get_Expr_Reg (Right); + -- Results can be: Reg, R_B_Off, R_Sib, R_Imm, R_B_I + case R_L is + when R_Any32 + | Regs_R32 => + case R_R is + when R_Imm => + Set_Expr_Reg (Stmt, R_B_Off); + when R_B_Off + | R_I + | R_I_Off => + Set_Expr_Reg (Stmt, R_Sib); + when R_Any32 + | Regs_R32 => + Set_Expr_Reg (Stmt, R_B_I); + when others => + Error_Gen_Insn (Stmt, R_R); + end case; + when R_Imm => + case R_R is + when R_Imm => + Set_Expr_Reg (Stmt, R_Imm); + when R_Any32 + | Regs_R32 + | R_B_Off => + Set_Expr_Reg (Stmt, R_B_Off); + when R_I + | R_I_Off => + Set_Expr_Reg (Stmt, R_I_Off); + when others => + Error_Gen_Insn (Stmt, R_R); + end case; + when R_B_Off => + case R_R is + when R_Imm => + Set_Expr_Reg (Stmt, R_B_Off); + when R_Any32 + | Regs_R32 + | R_I => + Set_Expr_Reg (Stmt, R_Sib); + when others => + Error_Gen_Insn (Stmt, R_R); + end case; + when R_I_Off => + case R_R is + when R_Imm => + Set_Expr_Reg (Stmt, R_I_Off); + when R_Any32 + | Regs_R32 => + Set_Expr_Reg (Stmt, R_Sib); + when others => + Error_Gen_Insn (Stmt, R_R); + end case; + when R_I => + case R_R is + when R_Imm + | Regs_R32 + | R_B_Off => + Set_Expr_Reg (Stmt, R_Sib); + when others => + Error_Gen_Insn (Stmt, R_R); + end case; + when R_Sib + | R_B_I => + if R_R = R_Imm then + Set_Expr_Reg (Stmt, R_Sib); + else + Num := Get_Insn_Num; + Free_Insn_Regs (Left); + Set_Expr_Reg (Left, Alloc_Reg (R_Any32, Left, Num)); + Link_Stmt (Left); + case R_R is + when R_Any32 + | Regs_R32 + | R_I => + Set_Expr_Reg (Stmt, R_B_I); + when others => + Error_Gen_Insn (Stmt, R_R); + end case; + end if; + when others => + Error_Gen_Insn (Stmt, R_L); + end case; + + case Reg is + when R_Sib => + null; + when R_Ir + | R_Irm => + if Get_Expr_Reg (Stmt) /= R_Imm then + Set_Expr_Reg (Stmt, Alloc_Reg (R_Any32, Stmt, Pnum)); + Free_Insn_Regs (Left); + Free_Insn_Regs (Right); + Link_Stmt (Stmt); + end if; + when R_Any32 + | Regs_R32 => + Set_Expr_Reg (Stmt, Alloc_Reg (Reg, Stmt, Pnum)); + Link_Stmt (Stmt); + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + end; + return Stmt; + when OE_Mul => + Num := Get_Insn_Num; + Left := Gen_Insn (Get_Expr_Left (Stmt), R_Ax, Num); + Set_Expr_Left (Stmt, Left); + + Right := Gen_Insn (Get_Expr_Right (Stmt), R_Any32, Num); + if Get_Expr_Kind (Right) /= OE_Const then + raise Program_Error; + end if; + Set_Expr_Right (Stmt, Right); + + Free_Insn_Regs (Left); + Free_Insn_Regs (Right); + Clobber_R32 (R_Dx); + Set_Expr_Reg (Stmt, Alloc_Reg (R_Ax, Stmt, Pnum)); + case Reg is + when R_Sib + | R_B_Off => + null; + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + Link_Stmt (Stmt); + return Stmt; + when OE_Shl => + Num := Get_Insn_Num; + Right := Get_Expr_Right (Stmt); + if Get_Expr_Kind (Right) /= OE_Const then + Right := Gen_Insn (Right, R_Cx, Num); + else + Right := Gen_Insn (Right, R_Imm, Num); + end if; + Left := Get_Expr_Left (Stmt); + Reg1 := Get_Reg_Any (Stmt); + Left := Gen_Insn (Left, Reg1, Pnum); + if Get_Expr_Kind (Right) /= OE_Const then + Right := Reload (Right, R_Cx, Num); + end if; + Left := Reload (Left, Reg1, Pnum); + Set_Expr_Left (Stmt, Left); + Set_Expr_Right (Stmt, Right); + if Reg = R_Sib + and then Get_Expr_Kind (Right) = OE_Const + and then Get_Expr_Low (Right) in 0 .. 3 + then + Set_Expr_Reg (Stmt, R_I); + else + Link_Stmt (Stmt); + Set_Expr_Reg (Stmt, Get_Expr_Reg (Left)); + Free_Insn_Regs (Right); + end if; + return Stmt; + + when OE_Add_Ov + | OE_Sub_Ov + | OE_And + | OE_Xor + | OE_Or => + -- Accepted is: R with IMM or R/M + Num := Get_Insn_Num; + Right := Get_Expr_Right (Stmt); + Left := Get_Expr_Left (Stmt); + case Reg is + when R_Irm + | R_Rm + | R_Ir + | R_Sib => + Right := Gen_Insn (Right, R_Irm, Num); + Reg1 := Get_Reg_Any (Stmt); + Left := Gen_Insn (Left, Reg1, Num); + Right := Reload (Right, R_Irm, Num); + Left := Reload (Left, Reg1, Num); + Reg_Res := Get_Expr_Reg (Left); + when R_Any_Cc => + Right := Gen_Insn (Right, R_Irm, Num); + Left := Gen_Insn (Left, R_Any8, Num); + Reg_Res := R_Ne; + Alloc_Cc (Stmt, Num); + Free_Insn_Regs (Left); + when R_Any32 + | Regs_R32 + | R_Any8 + | R_Any64 + | Regs_R64 + | Regs_Fp => + Right := Gen_Insn (Right, R_Irm, Num); + Left := Gen_Insn (Left, Reg, Num); + Right := Reload (Right, R_Irm, Num); + Left := Reload (Left, Reg, Num); + Reg_Res := Get_Expr_Reg (Left); + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + Set_Expr_Right (Stmt, Right); + Set_Expr_Left (Stmt, Left); + Set_Expr_Reg (Stmt, Reg_Res); + Renum_Reg (Reg_Res, Stmt, Pnum); + Link_Stmt (Stmt); + Free_Insn_Regs (Right); + return Stmt; + + when OE_Mod + | OE_Rem + | OE_Mul_Ov + | OE_Div_Ov => + declare + Mode : Mode_Type; + begin + Num := Get_Insn_Num; + Mode := Get_Expr_Mode (Stmt); + Left := Get_Expr_Left (Stmt); + Right := Get_Expr_Right (Stmt); + case Mode is + when Mode_I32 + | Mode_U32 + | Mode_I16 + | Mode_U16 => + Left := Gen_Insn (Left, R_Ax, Num); + Right := Gen_Insn (Right, R_Rm, Num); + Left := Reload (Left, R_Ax, Num); + case Kind is + when OE_Div_Ov + | OE_Rem + | OE_Mod => + -- Be sure EDX is free. + Reg_Res := Alloc_Reg (R_Dx, Stmt, Pnum); + when others => + Reg_Res := R_Nil; + end case; + Right := Reload (Right, R_Rm, Num); + Set_Expr_Right (Stmt, Right); + Set_Expr_Left (Stmt, Left); + Free_Insn_Regs (Left); + Free_Insn_Regs (Right); + if Reg_Res /= R_Nil then + Free_R32 (Reg_Res); + end if; + if Kind = OE_Div_Ov or Kind = OE_Mul_Ov then + Reg_Res := R_Ax; + Clobber_R32 (R_Dx); + else + Reg_Res := R_Dx; + Clobber_R32 (R_Ax); + end if; + Set_Expr_Reg (Stmt, Alloc_Reg (Reg_Res, Stmt, Pnum)); + Link_Stmt (Stmt); + return Reload (Stmt, Reg, Pnum); + when Mode_U64 + | Mode_I64 => + -- FIXME: align stack + Insert_Arg (Gen_Insn (Right, R_Irm, Num)); + Insert_Arg (Gen_Insn (Left, R_Irm, Num)); + return Insert_Intrinsic (Stmt, R_Edx_Eax, Pnum); + when Mode_F32 + | Mode_F64 => + Left := Gen_Insn (Left, R_St0, Num); + Right := Gen_Insn (Right, R_Rm, Num); + Set_Expr_Left (Stmt, Left); + Set_Expr_Right (Stmt, Right); + Free_Insn_Regs (Right); + Free_Insn_Regs (Left); + Set_Expr_Reg (Stmt, Alloc_Reg (R_St0, Stmt, Pnum)); + Link_Stmt (Stmt); + return Stmt; + when others => + Error_Gen_Insn (Stmt, Mode); + end case; + end; + + when OE_Not + | OE_Abs_Ov + | OE_Neg_Ov => + Left := Get_Expr_Operand (Stmt); + case Reg is + when R_Any32 + | Regs_R32 + | R_Any64 + | Regs_R64 + | R_Any8 + | R_St0 => + Reg_Res := Reg; + when R_Any_Cc => + if Kind /= OE_Not then + raise Program_Error; + end if; + Left := Gen_Insn (Left, R_Any_Cc, Pnum); + Set_Expr_Operand (Stmt, Left); + Reg_Res := Inverse_Cc (Get_Expr_Reg (Left)); + Free_Cc; + Set_Expr_Reg (Stmt, Reg_Res); + Alloc_Cc (Stmt, Pnum); + return Stmt; + when R_Irm + | R_Rm + | R_Ir => + Reg_Res := Get_Reg_Any (Get_Expr_Mode (Left)); + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + Left := Gen_Insn (Left, Reg_Res, Pnum); + Set_Expr_Operand (Stmt, Left); + Reg_Res := Get_Expr_Reg (Left); + Free_Insn_Regs (Left); + Set_Expr_Reg (Stmt, Alloc_Reg (Reg_Res, Stmt, Pnum)); + Link_Stmt (Stmt); + return Stmt; + when OE_Conv => + declare + O_Mode : Mode_Type; -- Operand mode + R_Mode : Mode_Type; -- Result mode + begin + Left := Get_Expr_Operand (Stmt); + O_Mode := Get_Expr_Mode (Left); + R_Mode := Get_Expr_Mode (Stmt); + -- Simple case: no conversion. + -- FIXME: should be handled by EXPR and convert to NOP. + if Get_Expr_Mode (Left) = Get_Expr_Mode (Stmt) then + -- A no-op. + return Gen_Insn (Left, Reg, Pnum); + end if; + case R_Mode is + when Mode_B2 => + case O_Mode is + when Mode_U32 + | Mode_I32 => + -- Detect for bound. + null; + when others => + Error_Gen_Insn (Stmt, O_Mode); + end case; + when Mode_U8 => + case O_Mode is + when Mode_U16 + | Mode_U32 + | Mode_I32 => + -- Detect for bound. + null; + when others => + Error_Gen_Insn (Stmt, O_Mode); + end case; + when Mode_U32 => + case O_Mode is + when Mode_I32 => + -- Detect for bound. + null; + when Mode_B2 + | Mode_U8 + | Mode_U16 => + -- Zero extend. + null; + when others => + Error_Gen_Insn (Stmt, O_Mode); + end case; + when Mode_I32 => + case O_Mode is + when Mode_U8 + | Mode_I8 + | Mode_B2 + | Mode_U16 + | Mode_U32 => + -- Zero extend + -- Detect for bound (U32). + null; + when Mode_I64 => + -- Detect for bound (U32) + Num := Get_Insn_Num; + Left := Gen_Insn (Left, R_Edx_Eax, Num); + Free_Insn_Regs (Left); + Set_Expr_Operand (Stmt, Left); + case Reg is + when R_Ax + | R_Any32 + | R_Rm + | R_Irm + | R_Ir => + Set_Expr_Reg + (Stmt, Alloc_Reg (R_Ax, Stmt, Num)); + when others => + raise Program_Error; + end case; + Insert_Reg (Mode_U32); + Link_Stmt (Stmt); + return Stmt; + when Mode_F64 + | Mode_F32 => + return Gen_Conv_From_Fp_Insn (Stmt, Reg, Pnum); + when others => + Error_Gen_Insn (Stmt, O_Mode); + end case; + when Mode_I64 => + case O_Mode is + when Mode_I32 => + -- Sign extend. + Num := Get_Insn_Num; + Left := Gen_Insn (Left, R_Ax, Num); + Set_Expr_Operand (Stmt, Left); + Free_Insn_Regs (Left); + case Reg is + when R_Edx_Eax + | R_Any64 + | R_Rm + | R_Irm + | R_Ir => + Set_Expr_Reg + (Stmt, Alloc_Reg (R_Edx_Eax, Stmt, Pnum)); + when others => + raise Program_Error; + end case; + Link_Stmt (Stmt); + return Stmt; + when Mode_F64 + | Mode_F32 => + return Gen_Conv_From_Fp_Insn (Stmt, Reg, Pnum); + when others => + Error_Gen_Insn (Stmt, O_Mode); + end case; + when Mode_F64 => + case O_Mode is + when Mode_I32 + | Mode_I64 => + null; + when others => + Error_Gen_Insn (Stmt, O_Mode); + end case; + when others => + Error_Gen_Insn (Stmt, O_Mode); + end case; + Left := Gen_Insn (Left, R_Rm, Pnum); + Set_Expr_Operand (Stmt, Left); + case Reg is + when R_Irm + | R_Rm + | R_Ir + | R_Sib + | R_Any32 + | Regs_R32 + | R_Any64 + | R_Any8 + | Regs_R64 + | Regs_Fp => + Free_Insn_Regs (Left); + Set_Expr_Reg + (Stmt, Alloc_Reg (Get_Reg_Any (Stmt), Stmt, Pnum)); + when others => + Error_Gen_Insn (Stmt, Reg); + end case; + Link_Stmt (Stmt); + return Stmt; + end; + when OE_Arg => + if Reg /= R_None then + raise Program_Error; + end if; + Left := Get_Arg_Link (Stmt); + if Left /= O_Enode_Null then + -- Recurse on next argument, so the first argument is pushed + -- the last one. + Left := Gen_Insn (Left, R_None, Pnum); + end if; + + Left := Get_Expr_Operand (Stmt); + case Get_Expr_Mode (Left) is + when Mode_F32 .. Mode_F64 => + -- fstp instruction. + Reg_Res := R_St0; + when others => + -- Push instruction. + Reg_Res := R_Irm; + end case; + Left := Gen_Insn (Left, Reg_Res, Pnum); + Set_Expr_Operand (Stmt, Left); + Push_Offset := Push_Offset + + Do_Align (Get_Mode_Size (Get_Expr_Mode (Left)), Mode_U32); + Link_Stmt (Stmt); + Free_Insn_Regs (Left); + return Stmt; + when OE_Call => + return Gen_Call (Stmt, Reg, Pnum); + when OE_Case_Expr => + Left := Get_Expr_Operand (Stmt); + Set_Expr_Reg (Stmt, Alloc_Reg (Get_Expr_Reg (Left), Stmt, Pnum)); + return Stmt; + when OE_Get_Stack => + Set_Expr_Reg (Stmt, R_Sp); + return Stmt; + when OE_Get_Frame => + Set_Expr_Reg (Stmt, R_Bp); + return Stmt; + when others => + Ada.Text_IO.Put_Line + ("gen_insn: unhandled enode " & OE_Kind'Image (Kind)); + raise Program_Error; + end case; + end Gen_Insn; + + procedure Assert_Free_Regs (Stmt : O_Enode) is + begin + for I in Regs_R32 loop + if Regs (I).Num /= O_Free then + Error_Reg ("gen_insn_stmt: reg is not free", Stmt, I); + end if; + end loop; + for I in Fp_Stack_Type loop + if Fp_Regs (I).Stmt /= O_Enode_Null then + Error_Reg ("gen_insn_stmt: reg is not free", Stmt, R_St0); + end if; + end loop; + end Assert_Free_Regs; + + procedure Gen_Insn_Stmt (Stmt : O_Enode) + is + Kind : OE_Kind; + + Left : O_Enode; + Right : O_Enode; + P_Reg : O_Reg; + Num : O_Inum; + + Prev_Stack_Offset : Uns32; + begin + Insn_Num := O_Iroot; + Num := Get_Insn_Num; + Prev_Stack_Offset := Stack_Offset; + + Kind := Get_Expr_Kind (Stmt); + case Kind is + when OE_Asgn => + Left := Gen_Insn (Get_Expr_Operand (Stmt), R_Ir, Num); + Right := Gen_Insn (Get_Assign_Target (Stmt), R_Sib, Num); + Left := Reload (Left, R_Ir, Num); + --Right := Reload (Right, R_Sib, Num); + Set_Expr_Operand (Stmt, Left); + Set_Assign_Target (Stmt, Right); + Link_Stmt (Stmt); + Free_Insn_Regs (Left); + Free_Insn_Regs (Right); + when OE_Set_Stack => + Left := Gen_Insn (Get_Expr_Operand (Stmt), R_Rm, Num); + Set_Expr_Operand (Stmt, Left); + Set_Expr_Reg (Stmt, R_Sp); + Link_Stmt (Stmt); + when OE_Jump_F + | OE_Jump_T => + Left := Gen_Insn (Get_Expr_Operand (Stmt), R_Any_Cc, Num); + Set_Expr_Operand (Stmt, Left); + Link_Stmt (Stmt); + Free_Cc; + when OE_Beg => + declare + Block_Decl : O_Dnode; + begin + Cur_Block := Stmt; + Block_Decl := Get_Block_Decls (Cur_Block); + Set_Block_Max_Stack (Block_Decl, Stack_Offset); + Expand_Decls (Block_Decl); + end; + Link_Stmt (Stmt); + when OE_End => + Swap_Stack_Offset (Get_Block_Decls (Cur_Block)); + Cur_Block := Get_Block_Parent (Cur_Block); + Link_Stmt (Stmt); + when OE_Jump + | OE_Label => + Link_Stmt (Stmt); + when OE_Leave => + Link_Stmt (Stmt); + when OE_Call => + Link_Stmt (Gen_Call (Stmt, R_None, Num)); + when OE_Ret => + Left := Get_Expr_Operand (Stmt); + P_Reg := Get_Call_Register (Get_Expr_Mode (Stmt)); + Left := Gen_Insn (Left, P_Reg, Num); + Set_Expr_Operand (Stmt, Left); + Link_Stmt (Stmt); + Free_Insn_Regs (Left); + when OE_Case => + Left := Gen_Insn (Get_Expr_Operand (Stmt), + Get_Reg_Any (Get_Expr_Mode (Stmt)), + Num); + Set_Expr_Operand (Stmt, Left); + Set_Expr_Reg (Stmt, Get_Expr_Reg (Left)); + Link_Stmt (Stmt); + Free_Insn_Regs (Left); + when OE_Line => + Set_Expr_Reg (Stmt, R_None); + Link_Stmt (Stmt); + when OE_BB => + -- Keep BB. + Link_Stmt (Stmt); + when others => + Ada.Text_IO.Put_Line + ("gen_insn_stmt: unhandled enode " & OE_Kind'Image (Kind)); + raise Program_Error; + end case; + + -- Free any spill stack slots. + case Kind is + when OE_Beg + | OE_End => + null; + when others => + Stack_Offset := Prev_Stack_Offset; + end case; + + -- Check all registers are free. + if Debug.Flag_Debug_Assert then + Assert_Free_Regs (Stmt); + end if; + end Gen_Insn_Stmt; + + procedure Gen_Subprg_Insns (Subprg : Subprogram_Data_Acc) + is + First : O_Enode; + Stmt : O_Enode; + N_Stmt : O_Enode; + begin + if Debug.Flag_Debug_Insn then + declare + Inter : O_Dnode; + begin + Disp_Decl (1, Subprg.D_Decl); + Inter := Get_Subprg_Interfaces (Subprg.D_Decl); + while Inter /= O_Dnode_Null loop + Disp_Decl (2, Inter); + Inter := Get_Interface_Chain (Inter); + end loop; + end; + end if; + + for I in Regs_R32 loop + Regs (I).Used := False; + end loop; + + Stack_Max := 0; + Stack_Offset := 0; + First := Subprg.E_Entry; + Expand_Decls (Subprg.D_Body + 1); + Abi.Last_Link := First; + + -- Generate instructions. + -- Skip OE_Entry. + Stmt := Get_Stmt_Link (First); + loop + N_Stmt := Get_Stmt_Link (Stmt); + Gen_Insn_Stmt (Stmt); + exit when Get_Expr_Kind (Stmt) = OE_Leave; + Stmt := N_Stmt; + end loop; + + -- Keep stack depth for this subprogram. + Subprg.Stack_Max := Stack_Max; + + -- Sanity check: there must be no remaining pushed bytes. + if Push_Offset /= 0 then + raise Program_Error with "gen_subprg_insn: push_offset not 0"; + end if; + end Gen_Subprg_Insns; + +end Ortho_Code.X86.Insns; |