{ $Id$ Copyright (c) 1993-98 by Florian Klaempfl and Jonas Maebe This unit contains the peephole optimizer. 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., 675 Mass Ave, Cambridge, MA 02139, USA. **************************************************************************** } Unit POpt386; Interface Uses Aasm; Procedure PeepHoleOptPass1(AsmL: PAasmOutput; BlockStart, BlockEnd: Pai); Procedure PeepHoleOptPass2(AsmL: PAasmOutput; BlockStart, BlockEnd: Pai); Implementation Uses globtype,systems, globals,verbose,hcodegen, i386base,i386asm, DAOpt386; Function RegUsedAfterInstruction(Reg: TRegister; p: Pai; Var UsedRegs: TRegSet): Boolean; Begin UpdateUsedRegs(UsedRegs, Pai(p^.Next)); RegUsedAfterInstruction := Reg in UsedRegs End; Procedure PeepHoleOptPass1(Asml: PAasmOutput; BlockStart, BlockEnd: Pai); {First pass of peepholeoptimizations} Var l : longint; p ,hp1, hp2: pai; TmpBool1, TmpBool2: Boolean; TmpRef: PReference; UsedRegs, TmpUsedRegs: TRegSet; Procedure GetFinalDestination(hp: pai386_labeled); {traces sucessive jumps to their final destination and sets it, e.g. je l1 je l3 l1: becomes l1: je l2 je l3 l2: l2: jmp l3 jmp l3} Var p1: pai; Function SkipLabels(hp: Pai): Pai; {skips all labels and returns the next "real" instruction; it is assumed that hp is of the type ait_label} Begin While assigned(hp^.next) and (pai(hp^.next)^.typ In SkipInstr + [ait_label]) Do hp := pai(hp^.next); If assigned(hp^.next) Then SkipLabels := pai(hp^.next) Else SkipLabels := hp; End; Begin If (hp^.lab^.nb >= LoLab) and (hp^.lab^.nb <= HiLab) and {range check, a jump can go past an assembler block!} Assigned(LTable^[hp^.lab^.nb-LoLab].PaiObj) Then Begin p1 := LTable^[hp^.lab^.nb-LoLab].PaiObj; {the jump's destination} p1 := SkipLabels(p1); If (pai(p1)^.typ = ait_labeled_instruction) and ((pai386_labeled(p1)^.opcode = A_JMP) or ((pai386_labeled(p1)^.opcode = A_Jcc) and (pai386_labeled(p1)^.condition = hp^.condition))) Then Begin GetFinalDestination(pai386_labeled(p1)); Dec(hp^.lab^.refcount); If (hp^.lab^.refcount = 0) Then hp^.lab^.is_used := False; hp^.lab := pai386_labeled(p1)^.lab; Inc(hp^.lab^.refcount); End End End; Begin P := BlockStart; UsedRegs := []; While (P <> BlockEnd) Do Begin UpDateUsedRegs(UsedRegs, Pai(p^.next)); Case P^.Typ Of Ait_Labeled_Instruction: Begin {the following if-block removes all code between a jmp and the next label, because it can never be executed} If (pai386_labeled(p)^.opcode = A_JMP) Then Begin hp1 := pai(p^.next); While GetNextInstruction(p, hp1) and ((hp1^.typ <> ait_label) or { skip unused labels, they're not referenced anywhere } Not(Pai_Label(hp1)^.l^.is_used)) Do If (hp1^.typ <> ait_label) Then Begin AsmL^.Remove(hp1); Dispose(hp1, done); End; End; If GetNextInstruction(p, hp1) then Begin If (pai(hp1)^.typ=ait_labeled_instruction) and (pai386_labeled(hp1)^.opcode=A_JMP) and GetNextInstruction(hp1, hp2) And FindLabel(pai386_labeled(p)^.lab, hp2) Then Begin if pai386_labeled(p)^.opcode=A_Jcc then pai386_labeled(p)^.condition:=inverse_cond[pai386_labeled(p)^.condition] else begin If (LabDif <> 0) Then GetFinalDestination(pai386_labeled(p)); p:=pai(p^.next); continue; end; Dec(pai_label(hp2)^.l^.refcount); If (pai_label(hp2)^.l^.refcount = 0) Then pai_label(hp2)^.l^.is_used := False; pai386_labeled(p)^.lab:=pai386_labeled(hp1)^.lab; Inc(pai386_labeled(p)^.lab^.refcount); asml^.remove(hp1); dispose(hp1,done); If (LabDif <> 0) Then GetFinalDestination(pai386_labeled(p)); end else if FindLabel(pai386_labeled(p)^.lab, hp1) then Begin hp2:=pai(hp1^.next); asml^.remove(p); dispose(p,done); p:=hp2; continue; end Else If (LabDif <> 0) Then GetFinalDestination(pai386_labeled(p)); end end; ait_instruction: Begin If (Pai386(p)^.oper[0].typ = top_ref) Then With Pai386(p)^.oper[0].ref^ Do Begin If (base = R_NO) And (index <> R_NO) And (scalefactor = 1) Then Begin base := index; index := R_NO End End; If (Pai386(p)^.oper[1].typ = top_ref) Then With Pai386(p)^.oper[1].ref^ Do Begin If (base = R_NO) And (index <> R_NO) And (scalefactor = 1) Then Begin base := index; index := R_NO End End; Case Pai386(p)^.opcode Of A_AND: Begin If (Pai386(p)^.oper[0].typ = top_const) And (Pai386(p)^.oper[1].typ = top_reg) And GetNextInstruction(p, hp1) And (Pai(hp1)^.typ = ait_instruction) And (Pai386(hp1)^.opcode = A_AND) And (Pai386(hp1)^.oper[0].typ = top_const) And (Pai386(hp1)^.oper[1].typ = top_reg) And (Pai386(hp1)^.oper[1].reg = Pai386(hp1)^.oper[1].reg) Then {change "and const1, reg; and const2, reg" to "and (const1 and const2), reg"} Begin Pai386(p)^.LoadConst(0,Pai386(p)^.oper[0].val And Pai386(hp1)^.oper[0].val); AsmL^.Remove(hp1); Dispose(hp1, Done) End Else {change "and x, reg; jxx" to "test x, reg", if reg is deallocated before the jump} If (Pai386(p)^.oper[1].typ = top_reg) And GetNextInstruction(p, hp1) And (hp1^.typ = ait_labeled_instruction) And Not(Pai386(p)^.oper[1].reg in UsedRegs) Then Pai386(p)^.opcode := A_TEST; End; A_CMP: Begin If (Pai386(p)^.oper[0].typ = top_const) And (Pai386(p)^.oper[1].typ = top_reg) And (Pai386(p)^.oper[0].val = 0) Then {change "cmp $0, %reg" to "test %reg, %reg"} Begin Pai386(p)^.opcode := A_TEST; Pai386(p)^.loadreg(0,Pai386(p)^.oper[1].reg); End; End; A_FLD: Begin If (Pai386(p)^.oper[0].typ = top_ref) And GetNextInstruction(p, hp2) And (hp2^.typ = Ait_Instruction) And (Pai386(hp2)^.oper[0].typ = top_reg) And (Pai386(hp2)^.oper[1].typ = top_reg) And (Pai386(p)^.opsize in [S_FS, S_FL]) And (Pai386(hp2)^.oper[0].reg = R_ST) And (Pai386(hp2)^.oper[1].reg = R_ST1) Then If GetLastInstruction(p, hp1) And (hp1^.typ = Ait_Instruction) And ((Pai386(hp1)^.opcode = A_FLD) Or (Pai386(hp1)^.opcode = A_FST)) And (Pai386(hp1)^.opsize = Pai386(p)^.opsize) And (Pai386(hp1)^.oper[0].typ = top_ref) And RefsEqual(Pai386(p)^.oper[0].ref^, Pai386(hp1)^.oper[0].ref^) Then If ((Pai386(hp2)^.opcode = A_FMULP) Or (Pai386(hp2)^.opcode = A_FADDP)) Then { change to fld/fst mem1 (hp1) fld/fst mem1 fld mem1 (p) fadd/ faddp/ fmul st, st fmulp st, st1 (hp2) } Begin AsmL^.Remove(p); Dispose(p, Done); p := hp1; If (Pai386(hp2)^.opcode = A_FADDP) Then Pai386(hp2)^.opcode := A_FADD Else Pai386(hp2)^.opcode := A_FMUL; Pai386(hp2)^.oper[1].reg := R_ST; End Else { change to fld/fst mem1 (hp1) fld/fst mem1 fld mem1 (p) fld st} Begin Pai386(p)^.changeopsize(S_FL); Pai386(p)^.loadreg(0,R_ST); End Else Begin Case Pai386(hp2)^.opcode Of A_FMULP,A_FADDP,A_FSUBP,A_FDIVP,A_FSUBRP,A_FDIVRP: { change to fld/fst mem1 (hp1) fld/fst mem1 fld mem2 (p) fxxx mem2 fxxxp st, st1 (hp2) } Begin Case Pai386(hp2)^.opcode Of A_FADDP: Pai386(p)^.opcode := A_FADD; A_FMULP: Pai386(p)^.opcode := A_FMUL; A_FSUBP: Pai386(p)^.opcode := A_FSUBR; A_FSUBRP: Pai386(p)^.opcode := A_FSUB; A_FDIVP: Pai386(p)^.opcode := A_FDIVR; A_FDIVRP: Pai386(p)^.opcode := A_FDIV; End; AsmL^.Remove(hp2); Dispose(hp2, Done) End End End End; A_FSTP,A_FISTP: Begin If (Pai386(p)^.oper[0].typ = top_ref) And GetNextInstruction(p, hp1) And (Pai(hp1)^.typ = ait_instruction) And (((Pai386(hp1)^.opcode = A_FLD) And (Pai386(p)^.opcode = A_FSTP)) Or ((Pai386(p)^.opcode = A_FISTP) And (Pai386(hp1)^.opcode = A_FILD))) And (Pai386(hp1)^.oper[0].typ = top_ref) And (Pai386(hp1)^.opsize = Pai386(p)^.opsize) And RefsEqual(Pai386(p)^.oper[0].ref^, Pai386(hp1)^.oper[0].ref^) Then Begin If GetNextInstruction(hp1, hp2) And (hp2^.typ = ait_instruction) And ((Pai386(hp2)^.opcode = A_LEAVE) Or (Pai386(hp2)^.opcode = A_RET)) And (Pai386(p)^.oper[0].ref^.Base = ProcInfo.FramePointer) And (Pai386(p)^.oper[0].ref^.Offset >= ProcInfo.RetOffset) And (Pai386(p)^.oper[0].ref^.Index = R_NO) Then Begin AsmL^.Remove(p); AsmL^.Remove(hp1); Dispose(p, Done); Dispose(hp1, Done); p := hp2; Continue End Else {fst can't store an extended value!} If (Pai386(p)^.opsize <> S_FX) And (Pai386(p)^.opsize <> S_IQ) Then Begin If (Pai386(p)^.opcode = A_FSTP) Then Pai386(p)^.opcode := A_FST Else Pai386(p)^.opcode := A_FIST; AsmL^.Remove(hp1); Dispose(hp1, done) End End; End; A_IMUL: {changes certain "imul const, %reg"'s to lea sequences} Begin If (Pai386(p)^.oper[0].typ = Top_Const) And (Pai386(p)^.oper[1].typ = Top_Reg) And (Pai386(p)^.opsize = S_L) Then If (Pai386(p)^.oper[0].val = 1) Then If (Pai386(p)^.oper[2].typ = Top_None) Then {remove "imul $1, reg"} Begin hp1 := Pai(p^.Next); AsmL^.Remove(p); Dispose(p, Done); p := hp1; Continue; End Else {change "imul $1, reg1, reg2" to "mov reg1, reg2"} Begin hp1 := New(Pai386, Op_Reg_Reg(A_MOV, S_L, Pai386(p)^.oper[1].reg,Pai386(p)^.oper[2].reg)); hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL, p^.previous, p^.next, hp1); Dispose(p, Done); p := hp1; End Else If ((Pai386(p)^.oper[2].typ = Top_Reg) or (Pai386(p)^.oper[2].typ = Top_None)) And (aktoptprocessor < ClassP6) And (Pai386(p)^.oper[0].val <= 12) And Not(CS_LittleSize in aktglobalswitches) And (Not(GetNextInstruction(p, hp1)) Or {GetNextInstruction(p, hp1) And} Not((Pai(hp1)^.typ = ait_labeled_instruction) And ((pai386_labeled(hp1)^.opcode = A_Jcc) and (pai386_labeled(hp1)^.condition in [C_O,C_NO])))) Then Begin New(TmpRef); Reset_reference(tmpref^); Case Pai386(p)^.oper[0].val Of 3: Begin {imul 3, reg1, reg2 to lea (reg1,reg1,2), reg2 imul 3, reg1 to lea (reg1,reg1,2), reg1} TmpRef^.base := Pai386(p)^.oper[1].reg; TmpRef^.Index := Pai386(p)^.oper[1].reg; TmpRef^.ScaleFactor := 2; If (Pai386(p)^.oper[2].typ = Top_None) Then hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[1].reg)) Else hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[2].reg)); hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p^.previous, p^.next, hp1); Dispose(p, Done); p := hp1; End; 5: Begin {imul 5, reg1, reg2 to lea (reg1,reg1,4), reg2 imul 5, reg1 to lea (reg1,reg1,4), reg1} TmpRef^.base := Pai386(p)^.oper[1].reg; TmpRef^.Index := Pai386(p)^.oper[1].reg; TmpRef^.ScaleFactor := 4; If (Pai386(p)^.oper[2].typ = Top_None) Then hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[1].reg)) Else hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[2].reg)); hp1^.fileinfo:= p^.fileinfo; InsertLLItem(AsmL,p^.previous, p^.next, hp1); Dispose(p, Done); p := hp1; End; 6: Begin {imul 6, reg1, reg2 to lea (,reg1,2), reg2 lea (reg2,reg1,4), reg2 imul 6, reg1 to lea (reg1,reg1,2), reg1 add reg1, reg1} If (aktoptprocessor <= Class386) Then Begin TmpRef^.Index := Pai386(p)^.oper[1].reg; If (Pai386(p)^.oper[2].typ = Top_Reg) Then Begin TmpRef^.base := Pai386(p)^.oper[2].reg; TmpRef^.ScaleFactor := 4; hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[1].reg)); End Else Begin Dispose(TmpRef); hp1 := New(Pai386, op_reg_reg(A_ADD, S_L, Pai386(p)^.oper[1].reg,Pai386(p)^.oper[1].reg)); End; hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p, p^.next, hp1); New(TmpRef); Reset_reference(tmpref^); TmpRef^.Index := Pai386(p)^.oper[1].reg; TmpRef^.ScaleFactor := 2; If (Pai386(p)^.oper[2].typ = Top_Reg) Then Begin TmpRef^.base := R_NO; hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[2].reg)); End Else Begin TmpRef^.base := Pai386(p)^.oper[1].reg; hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[1].reg)); End; hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p^.previous, p^.next, hp1); Dispose(p, Done); p := Pai(hp1^.next); End Else Dispose(TmpRef); End; 9: Begin {imul 9, reg1, reg2 to lea (reg1,reg1,8), reg2 imul 9, reg1 to lea (reg1,reg1,8), reg1} TmpRef^.base := Pai386(p)^.oper[1].reg; TmpRef^.Index := Pai386(p)^.oper[1].reg; TmpRef^.ScaleFactor := 8; If (Pai386(p)^.oper[2].typ = Top_None) Then hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[1].reg)) Else hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[2].reg)); hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p^.previous, p^.next, hp1); Dispose(p, Done); p := hp1; End; 10: Begin {imul 10, reg1, reg2 to lea (reg1,reg1,4), reg2 add reg2, reg2 imul 10, reg1 to lea (reg1,reg1,4), reg1 add reg1, reg1} If (aktoptprocessor <= Class386) Then Begin If (Pai386(p)^.oper[2].typ = Top_Reg) Then hp1 := New(Pai386, op_reg_reg(A_ADD, S_L, Pai386(p)^.oper[2].reg,Pai386(p)^.oper[2].reg)) Else hp1 := New(Pai386, op_reg_reg(A_ADD, S_L, Pai386(p)^.oper[1].reg,Pai386(p)^.oper[1].reg)); hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p, p^.next, hp1); TmpRef^.base := Pai386(p)^.oper[1].reg; TmpRef^.Index := Pai386(p)^.oper[1].reg; TmpRef^.ScaleFactor := 4; If (Pai386(p)^.oper[2].typ = Top_Reg) Then hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[2].reg)) Else hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[1].reg)); hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p^.previous, p^.next, hp1); Dispose(p, Done); p := Pai(hp1^.next); End Else Dispose(TmpRef); End; 12: Begin {imul 12, reg1, reg2 to lea (,reg1,4), reg2 lea (,reg1,8) reg2 imul 12, reg1 to lea (reg1,reg1,2), reg1 lea (,reg1,4), reg1} If (aktoptprocessor <= Class386) Then Begin TmpRef^.Index := Pai386(p)^.oper[1].reg; If (Pai386(p)^.oper[2].typ = Top_Reg) Then Begin TmpRef^.base := Pai386(p)^.oper[2].reg; TmpRef^.ScaleFactor := 8; hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[2].reg)); End Else Begin TmpRef^.base := R_NO; TmpRef^.ScaleFactor := 4; hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[1].reg)); End; hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p, p^.next, hp1); New(TmpRef); Reset_reference(tmpref^); TmpRef^.Index := Pai386(p)^.oper[1].reg; If (Pai386(p)^.oper[2].typ = Top_Reg) Then Begin TmpRef^.base := R_NO; TmpRef^.ScaleFactor := 4; hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[2].reg)); End Else Begin TmpRef^.base := Pai386(p)^.oper[1].reg; TmpRef^.ScaleFactor := 2; hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[1].reg)); End; hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p^.previous, p^.next, hp1); Dispose(p, Done); p := Pai(hp1^.next); End Else Dispose(TmpRef); End Else Dispose(TmpRef); End; End; End; A_LEA: Begin {removes seg register prefixes from LEA operations, as they don't do anything} Pai386(p)^.oper[0].ref^.Segment := R_NO; {changes "lea (%reg1), %reg2" into "mov %reg1, %reg2"} If (Pai386(p)^.oper[0].ref^.Base In [R_EAX..R_EDI]) And (Pai386(p)^.oper[0].ref^.Index = R_NO) And (Pai386(p)^.oper[0].ref^.Offset = 0) And (Not(Assigned(Pai386(p)^.oper[0].ref^.Symbol))) Then If (Pai386(p)^.oper[0].ref^.Base <> Pai386(p)^.oper[1].reg) Then Begin hp1 := New(Pai386, op_reg_reg(A_MOV, S_L,Pai386(p)^.oper[0].ref^.Base, Pai386(p)^.oper[1].reg)); hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p^.previous,p^.next, hp1); Dispose(p, Done); p := hp1; Continue; End Else Begin hp1 := Pai(p^.Next); AsmL^.Remove(p); Dispose(p, Done); p := hp1; Continue; End; End; A_MOV: Begin TmpUsedRegs := UsedRegs; If (Pai386(p)^.oper[1].typ = top_reg) And (Pai386(p)^.oper[1].reg In [R_EAX, R_EBX, R_EDX, R_EDI]) And GetNextInstruction(p, hp1) And (Pai(hp1)^.typ = ait_instruction) And (Pai386(hp1)^.opcode = A_MOV) And (Pai386(hp1)^.oper[0].typ = top_reg) And (Pai386(hp1)^.oper[0].reg = Pai386(p)^.oper[1].reg) Then {we have "mov x, %treg; mov %treg, y} If not(RegUsedAfterInstruction(Pai386(p)^.oper[1].reg, hp1, TmpUsedRegs)) then {we've got "mov x, %treg; mov %treg, y; with %treg is not used after } Case Pai386(p)^.oper[0].typ Of top_reg: Begin { change "mov %reg, %treg; mov %treg, y" to "mov %reg, y" } Pai386(hp1)^.LoadOper(0,Pai386(p)^.oper[0]); AsmL^.Remove(p); Dispose(p, Done); p := hp1; continue; End; top_ref: If (Pai386(hp1)^.oper[1].typ = top_reg) Then Begin { change "mov mem, %treg; mov %treg, %reg" to "mov mem, %reg" } Pai386(p)^.Loadoper(1,Pai386(hp1)^.oper[1]); AsmL^.Remove(hp1); Dispose(hp1, Done); continue; End; End Else {remove an instruction which never makes sense: we've got "mov mem, %reg1; mov %reg1, %edi" and then EDI isn't used anymore!} { Begin If (Pai386(hp1)^.oper[1].reg = R_EDI) And Not(GetNextInstruction(hp1, hp2) And (Pai(hp2)^.typ = ait_instruction) And (Pai386(hp2)^.oper[1].typ = top_reg) And (Pai386(hp2)^.oper[1] = Pointer(R_ESI))) Then Begin AsmL^.Remove(hp1); Dispose(hp1, Done); Continue; End End} Else {Change "mov %reg1, %reg2; xxx %reg2, ???" to "mov %reg1, %reg2; xxx %reg1, ???" to avoid a write/read penalty} If (Pai386(p)^.oper[0].typ = top_reg) And (Pai386(p)^.oper[1].typ = top_reg) And GetNextInstruction(p,hp1) And (Pai(hp1)^.typ = ait_instruction) And (Pai386(hp1)^.oper[0].typ = top_reg) And (Pai386(hp1)^.oper[0].reg = Pai386(p)^.oper[1].reg) Then {we have "mov %reg1, %reg2; XXX %reg2, ???"} Begin If ((Pai386(hp1)^.opcode = A_OR) Or (Pai386(hp1)^.opcode = A_TEST)) And (Pai386(hp1)^.oper[1].typ = top_reg) And (Pai386(hp1)^.oper[0].reg = Pai386(hp1)^.oper[1].reg) Then {we have "mov %reg1, %reg2; test/or %reg2, %reg2"} Begin TmpUsedRegs := UsedRegs; If GetNextInstruction(hp1, hp2) And (hp2^.typ = ait_labeled_instruction) And Not(RegUsedAfterInstruction(Pai386(hp1)^.oper[0].reg, hp1, TmpUsedRegs)) Then {change "mov %reg1, %reg2; test/or %reg2, %reg2; jxx" to "test %reg1, %reg1; jxx"} Begin Pai386(hp1)^.Loadoper(0,Pai386(p)^.oper[0]); Pai386(hp1)^.Loadoper(1,Pai386(p)^.oper[0]); AsmL^.Remove(p); Dispose(p, done); p := hp1; continue End Else {change "mov %reg1, %reg2; test/or %reg2, %reg2" to "mov %reg1, %reg2; test/or %reg1, %reg1"} Begin Pai386(hp1)^.Loadoper(0,Pai386(p)^.oper[0]); Pai386(hp1)^.Loadoper(1,Pai386(p)^.oper[0]); End; End { Else If (Pai386(p^.next)^.opcode In [A_PUSH, A_OR, A_XOR, A_AND, A_TEST])} {change "mov %reg1, %reg2; push/or/xor/... %reg2, ???" to "mov %reg1, %reg2; push/or/xor/... %reg1, ???"} End Else {leave out the mov from "mov reg, x(%frame_pointer); leave/ret" (with x >= RetOffset) as it doesn't do anything (it writes either to a parameter or to the temporary storage room for the function result)} If GetNextInstruction(p, hp1) And (Pai(hp1)^.typ = ait_instruction) Then If ((Pai386(hp1)^.opcode = A_LEAVE) Or (Pai386(hp1)^.opcode = A_RET)) And (Pai386(p)^.oper[1].typ = top_ref) And (Pai386(p)^.oper[1].ref^.base = ProcInfo.FramePointer) And (Pai386(p)^.oper[1].ref^.offset >= ProcInfo.RetOffset) And (Pai386(p)^.oper[1].ref^.index = R_NO) And (Pai386(p)^.oper[0].typ = top_reg) Then Begin AsmL^.Remove(p); Dispose(p, done); p := hp1; End Else If (Pai386(p)^.oper[0].typ = top_reg) And (Pai386(p)^.oper[1].typ = top_ref) And (Pai386(p)^.opsize = Pai386(hp1)^.opsize) And (Pai386(hp1)^.opcode = A_CMP) And (Pai386(hp1)^.oper[1].typ = top_ref) And RefsEqual(Pai386(p)^.oper[1].ref^, Pai386(hp1)^.oper[1].ref^) Then {change "mov reg, mem1; cmp x, mem1" to "mov reg, mem1; cmp x, reg1"} Pai386(hp1)^.loadreg(1,Pai386(p)^.oper[0].reg); { Next instruction is also a MOV ? } If GetNextInstruction(p, hp1) And (pai(hp1)^.typ = ait_instruction) and (Pai386(hp1)^.opcode = A_MOV) and (Pai386(hp1)^.opsize = Pai386(p)^.opsize) Then Begin If (Pai386(hp1)^.oper[0].typ = Pai386(p)^.oper[1].typ) and (Pai386(hp1)^.oper[1].typ = Pai386(p)^.oper[0].typ) Then {mov reg1, mem1 or mov mem1, reg1 mov mem2, reg2 mov reg2, mem2} Begin If OpsEqual(Pai386(hp1)^.oper[1],Pai386(p)^.oper[0]) Then {mov reg1, mem1 or mov mem1, reg1 mov mem2, reg1 mov reg2, mem1} Begin If OpsEqual(Pai386(hp1)^.oper[0],Pai386(p)^.oper[1]) Then { Removes the second statement from mov reg1, mem1 mov mem1, reg1 } Begin AsmL^.remove(hp1); Dispose(hp1,done); End Else Begin TmpUsedRegs := UsedRegs; UpdateUsedRegs(TmpUsedRegs, Pai(hp1^.next)); If (Pai386(p)^.oper[0].typ = top_reg) And { mov reg1, mem1 mov mem2, reg1 } GetNextInstruction(hp1, hp2) And (hp2^.typ = ait_instruction) And (Pai386(hp2)^.opcode = A_CMP) And (Pai386(hp2)^.opsize = Pai386(p)^.opsize) and (Pai386(hp2)^.oper[0].typ = TOp_Ref) And (Pai386(hp2)^.oper[1].typ = TOp_Reg) And RefsEqual(Pai386(hp2)^.oper[0].ref^, Pai386(p)^.oper[1].ref^) And (Pai386(hp2)^.oper[1].reg = Pai386(p)^.oper[0].reg) And Not(RegUsedAfterInstruction(Pai386(p)^.oper[0].reg, hp2, TmpUsedRegs)) Then { change to mov reg1, mem1 mov reg1, mem1 mov mem2, reg1 cmp reg1, mem2 cmp mem1, reg1 } Begin AsmL^.Remove(hp2); Dispose(hp2, Done); Pai386(hp1)^.opcode := A_CMP; Pai386(hp1)^.loadref(1,newreference(Pai386(hp1)^.oper[0].ref^)); Pai386(hp1)^.loadreg(0,Pai386(p)^.oper[0].reg); End; End; End Else Begin If GetNextInstruction(hp1, hp2) And (Pai386(p)^.oper[0].typ = top_ref) And (Pai386(p)^.oper[1].typ = top_reg) And (Pai386(hp1)^.oper[0].typ = top_reg) And (Pai386(hp1)^.oper[0].reg = Pai386(p)^.oper[1].reg) And (Pai386(hp1)^.oper[1].typ = top_ref) And (Pai(hp2)^.typ = ait_instruction) And (Pai386(hp2)^.opcode = A_MOV) And (Pai386(hp2)^.opsize = Pai386(p)^.opsize) and (Pai386(hp2)^.oper[1].typ = top_reg) And (Pai386(hp2)^.oper[0].typ = top_ref) And RefsEqual(Pai386(hp2)^.oper[0].ref^, Pai386(hp1)^.oper[1].ref^) Then If (Pai386(p)^.oper[1].reg in [R_DI,R_EDI]) Then { mov mem1, %edi mov %edi, mem2 mov mem2, reg2 to: mov mem1, reg2 mov reg2, mem2} Begin Pai386(p)^.Loadoper(1,Pai386(hp2)^.oper[1]); Pai386(hp1)^.loadoper(0,Pai386(hp2)^.oper[1]); AsmL^.Remove(hp2); Dispose(hp2,Done); End Else { mov mem1, reg1 mov mem1, reg1 mov reg1, mem2 mov reg1, mem2 mov mem2, reg2 mov mem2, reg1 to: to: mov mem1, reg1 mov mem1, reg1 mov mem1, reg2 mov reg1, mem2 mov reg1, mem2} Begin If (Pai386(p)^.oper[1].reg <> Pai386(hp2)^.oper[1].reg) Then Begin Pai386(hp1)^.LoadRef(0,newreference(Pai386(p)^.oper[0].ref^)); Pai386(hp1)^.LoadReg(1,Pai386(hp2)^.oper[1].reg); End Else Begin AsmL^.Remove(hp1); Dispose(hp1, Done) End; Pai386(hp2)^.LoadRef(1,newreference(Pai386(hp2)^.oper[0].ref^)); Pai386(hp2)^.LoadReg(0,Pai386(p)^.oper[1].reg); End; End; End Else (* {movl [mem1],reg1 movl [mem1],reg2 to: movl [mem1],reg1 movl reg1,reg2 } If (Pai386(p)^.oper[0].typ = top_ref) and (Pai386(p)^.oper[1].typ = top_reg) and (Pai386(hp1)^.oper[0].typ = top_ref) and (Pai386(hp1)^.oper[1].typ = top_reg) and (Pai386(p)^.opsize = Pai386(hp1)^.opsize) and RefsEqual(TReference(Pai386(p)^.oper[0]^),Pai386(hp1)^.oper[0]^.ref^) and (Pai386(p)^.oper[1].reg<>Pai386(hp1)^.oper[0]^.ref^.base) and (Pai386(p)^.oper[1].reg<>Pai386(hp1)^.oper[0]^.ref^.index) then Pai386(hp1)^.LoadReg(0,Pai386(p)^.oper[1].reg) Else*) { movl const1,[mem1] movl [mem1],reg1 to: movl const1,reg1 movl reg1,[mem1] } If (Pai386(p)^.oper[0].typ = top_const) and (Pai386(p)^.oper[1].typ = top_ref) and (Pai386(hp1)^.oper[0].typ = top_ref) and (Pai386(hp1)^.oper[1].typ = top_reg) and (Pai386(p)^.opsize = Pai386(hp1)^.opsize) and RefsEqual(Pai386(hp1)^.oper[0].ref^,Pai386(p)^.oper[1].ref^) then Begin Pai386(hp1)^.LoadReg(0,Pai386(hp1)^.oper[1].reg); Pai386(hp1)^.LoadRef(1,newreference(Pai386(p)^.oper[1].ref^)); Pai386(p)^.LoadReg(1,Pai386(hp1)^.oper[0].reg); End End; {changes "mov $0, %reg" into "xor %reg, %reg"} If (Pai386(p)^.oper[0].typ = Top_Const) And (Pai386(p)^.oper[0].val = 0) And (Pai386(p)^.oper[1].typ = Top_Reg) Then Begin Pai386(p)^.opcode := A_XOR; Pai386(p)^.LoadReg(0,Pai386(p)^.oper[1].reg); End; End; A_MOVZX: Begin {removes superfluous And's after movzx's} If (Pai386(p)^.oper[1].typ = top_reg) And GetNextInstruction(p, hp1) And (Pai(hp1)^.typ = ait_instruction) And (Pai386(hp1)^.opcode = A_AND) And (Pai386(hp1)^.oper[0].typ = top_const) And (Pai386(hp1)^.oper[1].typ = top_reg) And (Pai386(hp1)^.oper[1].reg = Pai386(p)^.oper[1].reg) Then Case Pai386(p)^.opsize Of S_BL, S_BW: If (Pai386(hp1)^.oper[0].val = $ff) Then Begin AsmL^.Remove(hp1); Dispose(hp1, Done); End; S_WL: If (Pai386(hp1)^.oper[0].val = $ffff) Then Begin AsmL^.Remove(hp1); Dispose(hp1, Done); End; End; {changes some movzx constructs to faster synonims (all examples are given with eax/ax, but are also valid for other registers)} If (Pai386(p)^.oper[1].typ = top_reg) Then If (Pai386(p)^.oper[0].typ = top_reg) Then Case Pai386(p)^.opsize of S_BW: Begin If (Pai386(p)^.oper[0].reg = Reg16ToReg8(Pai386(p)^.oper[1].reg)) And Not(CS_LittleSize In aktglobalswitches) Then {Change "movzbw %al, %ax" to "andw $0x0ffh, %ax"} Begin Pai386(p)^.opcode := A_AND; Pai386(p)^.changeopsize(S_W); Pai386(p)^.LoadConst(0,$ff); End Else If GetNextInstruction(p, hp1) And (Pai(hp1)^.typ = ait_instruction) And (Pai386(hp1)^.opcode = A_AND) And (Pai386(hp1)^.oper[0].typ = top_const) And (Pai386(hp1)^.oper[1].typ = top_reg) And (Pai386(hp1)^.oper[1].reg = Pai386(p)^.oper[1].reg) Then {Change "movzbw %reg1, %reg2; andw $const, %reg2" to "movw %reg1, reg2; andw $(const1 and $ff), %reg2"} Begin Pai386(p)^.opcode := A_MOV; Pai386(p)^.changeopsize(S_W); Pai386(p)^.LoadReg(0,Reg8ToReg16(Pai386(p)^.oper[0].reg)); Pai386(hp1)^.LoadConst(0,Pai386(hp1)^.oper[0].val And $ff); End; End; S_BL: Begin If (Pai386(p)^.oper[0].reg = Reg32ToReg8(Pai386(p)^.oper[1].reg)) And Not(CS_LittleSize in aktglobalswitches) Then {Change "movzbl %al, %eax" to "andl $0x0ffh, %eax"} Begin Pai386(p)^.opcode := A_AND; Pai386(p)^.changeopsize(S_L); Pai386(p)^.loadconst(0,$ff) End Else If GetNextInstruction(p, hp1) And (Pai(hp1)^.typ = ait_instruction) And (Pai386(hp1)^.opcode = A_AND) And (Pai386(hp1)^.oper[0].typ = top_const) And (Pai386(hp1)^.oper[1].typ = top_reg) And (Pai386(hp1)^.oper[1].reg = Pai386(p)^.oper[1].reg) Then {Change "movzbl %reg1, %reg2; andl $const, %reg2" to "movl %reg1, reg2; andl $(const1 and $ff), %reg2"} Begin Pai386(p)^.opcode := A_MOV; Pai386(p)^.changeopsize(S_L); Pai386(p)^.LoadReg(0,Reg8ToReg32(Pai386(p)^.oper[0].reg)); Pai386(hp1)^.LoadConst(0,Pai386(hp1)^.oper[0].val And $ff); End End; S_WL: Begin If (Pai386(p)^.oper[0].reg = Reg32ToReg16(Pai386(p)^.oper[1].reg)) And Not(CS_LittleSize In aktglobalswitches) Then {Change "movzwl %ax, %eax" to "andl $0x0ffffh, %eax"} Begin Pai386(p)^.opcode := A_AND; Pai386(p)^.changeopsize(S_L); Pai386(p)^.LoadConst(0,$ffff); End Else If GetNextInstruction(p, hp1) And (Pai(hp1)^.typ = ait_instruction) And (Pai386(hp1)^.opcode = A_AND) And (Pai386(hp1)^.oper[0].typ = top_const) And (Pai386(hp1)^.oper[1].typ = top_reg) And (Pai386(hp1)^.oper[1].reg = Pai386(p)^.oper[1].reg) Then {Change "movzwl %reg1, %reg2; andl $const, %reg2" to "movl %reg1, reg2; andl $(const1 and $ffff), %reg2"} Begin Pai386(p)^.opcode := A_MOV; Pai386(p)^.changeopsize(S_L); Pai386(p)^.LoadReg(0,Reg16ToReg32(Pai386(p)^.oper[0].reg)); Pai386(hp1)^.LoadConst(0,Pai386(hp1)^.oper[0].val And $ffff); End; End; End Else If (Pai386(p)^.oper[0].typ = top_ref) Then Begin If GetNextInstruction(p, hp1) And (Pai(hp1)^.typ = ait_instruction) And (Pai386(hp1)^.opcode = A_AND) And (Pai386(hp1)^.oper[0].typ = Top_Const) And (Pai386(hp1)^.oper[1].typ = Top_Reg) And (Pai386(hp1)^.oper[1].reg = Pai386(p)^.oper[1].reg) Then Begin Pai386(p)^.opcode := A_MOV; Case Pai386(p)^.opsize Of S_BL: Begin Pai386(p)^.changeopsize(S_L); Pai386(hp1)^.LoadConst(0,Pai386(hp1)^.oper[0].val And $ff); End; S_WL: Begin Pai386(p)^.changeopsize(S_L); Pai386(hp1)^.LoadConst(0,Pai386(hp1)^.oper[0].val And $ffff); End; S_BW: Begin Pai386(p)^.changeopsize(S_W); Pai386(hp1)^.LoadConst(0,Pai386(hp1)^.oper[0].val And $ff); End; End; End; End; End; A_POP: Begin if (Pai386(p)^.oper[0].typ = top_reg) And GetNextInstruction(p, hp1) And (pai(hp1)^.typ=ait_instruction) and (Pai386(hp1)^.opcode=A_PUSH) and (Pai386(hp1)^.oper[0].typ = top_reg) And (Pai386(hp1)^.oper[0].reg=Pai386(p)^.oper[0].reg) then If (Not(cs_regalloc in aktglobalswitches)) Then Begin hp2:=pai(hp1^.next); asml^.remove(p); asml^.remove(hp1); dispose(p,done); dispose(hp1,done); p:=hp2; continue End Else Begin { change it to a two op operation } Pai386(p)^.oper[1].typ:=top_none; Pai386(p)^.ops:=2; Pai386(p)^.opcode := A_MOV; Pai386(p)^.Loadoper(1,Pai386(p)^.oper[0]); New(TmpRef); Reset_reference(tmpref^); TmpRef^.base := R_ESP; Pai386(p)^.LoadRef(0,TmpRef); hp1 := Pai(p^.next); AsmL^.Remove(hp1); Dispose(hp1, Done) End end; A_PUSH: Begin If (Pai386(p)^.opsize = S_W) And (Pai386(p)^.oper[0].typ = Top_Const) And GetNextInstruction(p, hp1) And (Pai(hp1)^.typ = ait_instruction) And (Pai386(hp1)^.opcode = A_PUSH) And (Pai386(hp1)^.oper[0].typ = Top_Const) And (Pai386(hp1)^.opsize = S_W) Then Begin Pai386(p)^.changeopsize(S_L); Pai386(p)^.LoadConst(0,Pai386(p)^.oper[0].val shl 16 + Pai386(hp1)^.oper[0].val); AsmL^.Remove(hp1); Dispose(hp1, Done) End; End; A_SHL, A_SAL: Begin If (Pai386(p)^.oper[0].typ = Top_Const) And (Pai386(p)^.oper[1].typ = Top_Reg) And (Pai386(p)^.opsize = S_L) And (Pai386(p)^.oper[0].val <= 3) {Changes "shl const, %reg32; add const/reg, %reg32" to one lea statement} Then Begin TmpBool1 := True; {should we check the next instruction?} TmpBool2 := False; {have we found an add/sub which could be integrated in the lea?} New(TmpRef); Reset_reference(tmpref^); TmpRef^.index := Pai386(p)^.oper[1].reg; TmpRef^.scalefactor := 1 shl Pai386(p)^.oper[0].val; While TmpBool1 And GetNextInstruction(p, hp1) And (Pai(hp1)^.typ = ait_instruction) And ((Pai386(hp1)^.opcode = A_ADD) Or (Pai386(hp1)^.opcode = A_SUB)) And (Pai386(hp1)^.oper[1].typ = Top_Reg) And (Pai386(hp1)^.oper[1].reg = Pai386(p)^.oper[1].reg) Do Begin TmpBool1 := False; If (Pai386(hp1)^.oper[0].typ = Top_Const) Then Begin TmpBool1 := True; TmpBool2 := True; If Pai386(hp1)^.opcode = A_ADD Then Inc(TmpRef^.offset, Pai386(hp1)^.oper[0].val) Else Dec(TmpRef^.offset, Pai386(hp1)^.oper[0].val); AsmL^.Remove(hp1); Dispose(hp1, Done); End Else If (Pai386(hp1)^.oper[0].typ = Top_Reg) And (Pai386(hp1)^.opcode = A_ADD) And (TmpRef^.base = R_NO) Then Begin TmpBool1 := True; TmpBool2 := True; TmpRef^.base := Pai386(hp1)^.oper[0].reg; AsmL^.Remove(hp1); Dispose(hp1, Done); End; End; If TmpBool2 Or ((aktoptprocessor < ClassP6) And (Pai386(p)^.oper[0].val <= 3) And Not(CS_LittleSize in aktglobalswitches)) Then Begin If Not(TmpBool2) And (Pai386(p)^.oper[0].val = 1) Then Begin Dispose(TmpRef); hp1 := new(Pai386,op_reg_reg(A_ADD,Pai386(p)^.opsize, Pai386(p)^.oper[1].reg, Pai386(p)^.oper[1].reg)) End Else hp1 := New(Pai386, op_ref_reg(A_LEA, S_L, TmpRef, Pai386(p)^.oper[1].reg)); hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p^.previous, p^.next, hp1); Dispose(p, Done); p := hp1; End; End Else If (aktoptprocessor < ClassP6) And (Pai386(p)^.oper[0].typ = top_const) And (Pai386(p)^.oper[1].typ = top_reg) Then If (Pai386(p)^.oper[0].val = 1) Then {changes "shl $1, %reg" to "add %reg, %reg", which is the same on a 386, but faster on a 486, and pairable in both U and V pipes on the Pentium (unlike shl, which is only pairable in the U pipe)} Begin hp1 := new(Pai386,op_reg_reg(A_ADD,Pai386(p)^.opsize, Pai386(p)^.oper[1].reg, Pai386(p)^.oper[1].reg)); hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p^.previous, p^.next, hp1); Dispose(p, done); p := hp1; End Else If (Pai386(p)^.opsize = S_L) and (Pai386(p)^.oper[0].val<= 3) Then {changes "shl $2, %reg" to "lea (,%reg,4), %reg" "shl $3, %reg" to "lea (,%reg,8), %reg} Begin New(TmpRef); Reset_reference(tmpref^); TmpRef^.index := Pai386(p)^.oper[1].reg; TmpRef^.scalefactor := 1 shl Pai386(p)^.oper[0].val; hp1 := new(Pai386,op_ref_reg(A_LEA,S_L,TmpRef, Pai386(p)^.oper[1].reg)); hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p^.previous, p^.next, hp1); Dispose(p, done); p := hp1; End End; A_SAR, A_SHR: {changes the code sequence shr/sar const1, x shl const2, x to either "sar/and", "shl/and" or just "and" depending on const1 and const2} Begin If GetNextInstruction(p, hp1) And (pai(hp1)^.typ = ait_instruction) and (Pai386(hp1)^.opcode = A_SHL) and (Pai386(p)^.oper[0].typ = top_const) and (Pai386(hp1)^.oper[0].typ = top_const) and (Pai386(hp1)^.opsize = Pai386(p)^.opsize) And (Pai386(hp1)^.oper[1].typ = Pai386(p)^.oper[1].typ) And OpsEqual(Pai386(hp1)^.oper[1], Pai386(p)^.oper[1]) Then If (Pai386(p)^.oper[0].val > Pai386(hp1)^.oper[0].val) And Not(CS_LittleSize In aktglobalswitches) Then { shr/sar const1, %reg shl const2, %reg with const1 > const2 } Begin Pai386(p)^.LoadConst(0,Pai386(p)^.oper[0].val-Pai386(hp1)^.oper[0].val); Pai386(hp1)^.opcode := A_AND; l := 1 shl (Pai386(hp1)^.oper[0].val-1); Case Pai386(p)^.opsize Of S_L: Pai386(hp1)^.LoadConst(0,l Xor longint(-1)); S_B: Pai386(hp1)^.LoadConst(0,l Xor $ff); S_W: Pai386(hp1)^.LoadConst(0,l Xor $ffff); End; End Else If (Pai386(p)^.oper[0].val= ProcInfo.RetOffset) And (hp1^.typ = ait_instruction) And (Pai386(hp1)^.opcode = A_MOV) And (Pai386(hp1)^.opsize = S_B) And (Pai386(hp1)^.oper[0].typ = top_ref) And RefsEqual(Pai386(hp1)^.oper[0].ref^, Pai386(p)^.oper[0].ref^) Then Begin Pai386(p)^.LoadReg(0,Pai386(hp1)^.oper[1].reg); AsmL^.Remove(hp1); Dispose(hp1, Done) End End; A_SUB: { * change "subl $2, %esp; pushw x" to "pushl x"} { * change "sub/add const1, reg" or "dec reg" followed by "sub const2, reg" to one "sub ..., reg" } Begin If (Pai386(p)^.oper[0].typ = top_const) And (Pai386(p)^.oper[1].typ = top_reg) Then If (Pai386(p)^.oper[0].val = 2) And (Pai386(p)^.oper[1].reg = R_ESP) Then Begin hp1 := Pai(p^.next); While Assigned(hp1) And (Pai(hp1)^.typ In [ait_instruction]+SkipInstr) And Not((Pai(hp1)^.typ = ait_instruction) And ((Pai386(hp1)^.opcode = A_CALL) or (Pai386(hp1)^.opcode = A_PUSH) or ((Pai386(hp1)^.opcode = A_MOV) And (Pai386(hp1)^.oper[1].typ = top_ref) And (Pai386(hp1)^.oper[1].ref^.base = R_ESP)))) do hp1 := Pai(hp1^.next); If Assigned(hp1) And (Pai(hp1)^.typ = ait_instruction) And (Pai386(hp1)^.opcode = A_PUSH) And (Pai386(hp1)^.opsize = S_W) Then Begin Pai386(hp1)^.changeopsize(S_L); if Pai386(hp1)^.oper[0].typ=top_reg then Pai386(hp1)^.LoadReg(0,Reg16ToReg32(Pai386(hp1)^.oper[0].reg)); hp1 := Pai(p^.next); AsmL^.Remove(p); Dispose(p, Done); p := hp1; Continue End Else If GetLastInstruction(p, hp1) And (Pai(hp1)^.typ = ait_instruction) And (Pai386(hp1)^.opcode = A_SUB) And (Pai386(hp1)^.oper[0].typ = top_const) And (Pai386(hp1)^.oper[1].typ = top_reg) And (Pai386(hp1)^.oper[1].reg = R_ESP) Then Begin Pai386(p)^.LoadConst(0,Pai386(p)^.oper[0].val+Pai386(hp1)^.oper[0].val); AsmL^.Remove(hp1); Dispose(hp1, Done); End; End Else If GetLastInstruction(p, hp1) And (hp1^.typ = ait_instruction) And (Pai386(hp1)^.opsize = Pai386(p)^.opsize) then Case Pai386(hp1)^.opcode Of A_DEC: If (Pai386(hp1)^.oper[0].typ = top_reg) And (Pai386(hp1)^.oper[0].reg = Pai386(p)^.oper[1].reg) Then Begin Pai386(p)^.LoadConst(0,Pai386(p)^.oper[0].val+1); AsmL^.Remove(hp1); Dispose(hp1, Done) End; A_SUB: If (Pai386(hp1)^.oper[0].typ = top_const) And (Pai386(hp1)^.oper[1].typ = top_reg) And (Pai386(hp1)^.oper[1].reg = Pai386(p)^.oper[1].reg) Then Begin Pai386(p)^.LoadConst(0,Pai386(p)^.oper[0].val+Pai386(hp1)^.oper[0].val); AsmL^.Remove(hp1); Dispose(hp1, Done) End; A_ADD: If (Pai386(hp1)^.oper[0].typ = top_const) And (Pai386(hp1)^.oper[1].typ = top_reg) And (Pai386(hp1)^.oper[1].reg = Pai386(p)^.oper[1].reg) Then Begin Pai386(p)^.LoadConst(0,Pai386(p)^.oper[0].val-Pai386(hp1)^.oper[0].val); AsmL^.Remove(hp1); Dispose(hp1, Done) End; End End; A_TEST, A_OR: {removes the line marked with (x) from the sequence And/or/xor/add/sub/... $x, %y test/or %y, %y (x) j(n)z _Label as the first instruction already adjusts the ZF} Begin If OpsEqual(Pai386(p)^.oper[0],Pai386(p)^.oper[1]) And GetLastInstruction(p, hp1) And (pai(hp1)^.typ = ait_instruction) Then Case Pai386(hp1)^.opcode Of A_ADD, A_SUB, A_OR, A_XOR, A_AND, A_SHL, A_SHR: Begin If OpsEqual(Pai386(hp1)^.oper[1],Pai386(p)^.oper[0]) Then Begin hp1 := pai(p^.next); asml^.remove(p); dispose(p, done); p := pai(hp1); continue End; End; A_DEC, A_INC, A_NEG: Begin If OpsEqual(Pai386(hp1)^.oper[0],Pai386(p)^.oper[0]) Then Begin Case Pai386(hp1)^.opcode Of A_DEC, A_INC: {replace inc/dec with add/sub 1, because inc/dec doesn't set the carry flag} Begin Case Pai386(hp1)^.opcode Of A_DEC: Pai386(hp1)^.opcode := A_SUB; A_INC: Pai386(hp1)^.opcode := A_ADD; End; Pai386(hp1)^.Loadoper(1,Pai386(hp1)^.oper[0]); Pai386(hp1)^.LoadConst(0,1); Pai386(hp1)^.ops:=2; End End; hp1 := pai(p^.next); asml^.remove(p); dispose(p, done); p := pai(hp1); continue End; End End; End; End; End; { ait_label: Begin If Not(Pai_Label(p)^.l^.is_used) Then Begin hp1 := Pai(p^.next); AsmL^.Remove(p); Dispose(p, Done); p := hp1; Continue End; End;} End; p:=pai(p^.next); end; end; Procedure PeepHoleOptPass2(AsmL: PAasmOutput; BlockStart, BlockEnd: Pai); var p,hp1,hp2: pai; Begin P := BlockStart; While (P <> BlockEnd) Do Begin Case P^.Typ Of Ait_Instruction: Begin Case Pai386(p)^.opcode Of A_CALL: If (AktOptProcessor < ClassP6) And GetNextInstruction(p, hp1) And (hp1^.typ = ait_labeled_instruction) And (pai386_labeled(hp1)^.opcode = A_JMP) Then Begin Inc(pai386_labeled(hp1)^.lab^.refcount); hp2 := New(Pai386,op_sym(A_PUSH,S_L,NewAsmSymbol(Lab2Str(pai386_labeled(hp1)^.lab)))); hp2^.fileinfo := p^.fileinfo; InsertLLItem(AsmL, p^.previous, p, hp2); Pai386(p)^.opcode := A_JMP; AsmL^.Remove(hp1); Dispose(hp1, Done) End; A_MOV: Begin If (Pai386(p)^.oper[0].typ = top_reg) And (Pai386(p)^.oper[1].typ = top_reg) And GetNextInstruction(p, hp1) And (hp1^.typ = ait_Instruction) And (Pai386(hp1)^.opcode = A_MOV) And (Pai386(hp1)^.oper[0].typ = top_ref) And (Pai386(hp1)^.oper[1].typ = top_reg) And ((Pai386(hp1)^.oper[0].ref^.Base = Pai386(p)^.oper[1].reg) Or (Pai386(hp1)^.oper[0].ref^.Index = Pai386(p)^.oper[1].reg)) And (Pai386(hp1)^.oper[1].reg = Pai386(p)^.oper[1].reg) Then {mov reg1, reg2 mov (reg2, ..), reg2 to mov (reg1, ..), reg2} Begin If (Pai386(hp1)^.oper[0].ref^.Base = Pai386(p)^.oper[1].reg) Then Pai386(hp1)^.oper[0].ref^.Base := Pai386(p)^.oper[0].reg; If (Pai386(hp1)^.oper[0].ref^.Index = Pai386(p)^.oper[1].reg) Then Pai386(hp1)^.oper[0].ref^.Index := Pai386(p)^.oper[0].reg; AsmL^.Remove(p); Dispose(p, Done); p := hp1; Continue; End; End; A_MOVZX: Begin If (Pai386(p)^.oper[1].typ = top_reg) Then If (Pai386(p)^.oper[0].typ = top_reg) Then Case Pai386(p)^.opsize of S_BL: Begin If IsGP32Reg(Pai386(p)^.oper[1].reg) And Not(CS_LittleSize in aktglobalswitches) And (aktoptprocessor = ClassP5) Then {Change "movzbl %reg1, %reg2" to "xorl %reg2, %reg2; movb %reg1, %reg2" for Pentium and PentiumMMX} Begin hp1 := New(Pai386, op_reg_reg(A_XOR, S_L, Pai386(p)^.oper[1].reg, Pai386(p)^.oper[1].reg)); hp1^.fileinfo := p^.fileinfo; InsertLLItem(AsmL,p^.previous, p, hp1); Pai386(p)^.opcode := A_MOV; Pai386(p)^.changeopsize(S_B); Pai386(p)^.LoadReg(1,Reg32ToReg8(Pai386(p)^.oper[1].reg)); End; End; End Else If (Pai386(p)^.oper[0].typ = top_ref) And (Pai386(p)^.oper[0].ref^.base <> Pai386(p)^.oper[1].reg) And (Pai386(p)^.oper[0].ref^.index <> Pai386(p)^.oper[1].reg) And Not(CS_LittleSize in aktglobalswitches) And IsGP32Reg(Pai386(p)^.oper[1].reg) And (aktoptprocessor = ClassP5) And (Pai386(p)^.opsize = S_BL) Then {changes "movzbl mem, %reg" to "xorl %reg, %reg; movb mem, %reg8" for Pentium and PentiumMMX} Begin hp1 := New(Pai386,op_reg_reg(A_XOR, S_L, Pai386(p)^.oper[1].reg, Pai386(p)^.oper[1].reg)); hp1^.fileinfo := p^.fileinfo; Pai386(p)^.opcode := A_MOV; Pai386(p)^.changeopsize(S_B); Pai386(p)^.LoadReg(1,Reg32ToReg8(Pai386(p)^.oper[1].reg)); InsertLLItem(AsmL,p^.previous, p, hp1); End; End; End; End; End; p := Pai(p^.next) End; End; End. { $Log$ Revision 1.53 1999-05-12 00:19:52 peter * removed R_DEFAULT_SEG * uniform float names Revision 1.52 1999/05/05 16:19:04 jonas + remove the segment prefixes from LEA instructions Revision 1.51 1999/05/05 10:05:54 florian * a delphi compiled compiler recompiles ppc Revision 1.50 1999/05/02 21:33:55 florian * several bugs regarding -Or fixed Revision 1.49 1999/05/02 14:26:31 peter * fixed dec -> sub $1 opt which didn't set ops=2 Revision 1.48 1999/05/01 13:24:34 peter * merged nasm compiler * old asm moved to oldasm/ Revision 1.5 1999/04/30 12:36:50 jonas * fix from Brussels: call/jmp => push/jmp transformation didn't count correctly the jmp references Revision 1.4 1999/04/10 16:14:11 peter * fixed optimizer Revision 1.3 1999/04/09 08:33:18 peter * fixed mov reg,treg;mov treg,x bug Revision 1.2 1999/03/29 16:05:51 peter * optimizer working for ag386bin Revision 1.1 1999/03/26 00:01:15 peter * first things for optimizer (compiles but cycle crashes) Revision 1.39 1999/02/26 00:48:22 peter * assembler writers fixed for ag386bin Revision 1.38 1999/02/25 21:02:44 peter * ag386bin updates + coff writer Revision 1.37 1999/02/22 02:15:30 peter * updates for ag386bin Revision 1.36 1999/01/04 22:04:15 jonas + mov reg, mem1 to mov reg, mem1 mov mem2, reg cmp reg, mem2 cmp mem1, reg # reg released Revision 1.35 1999/01/04 12:58:55 jonas * no fistp/fild optimization for S_IQ (fistq doesn't exist) Revision 1.34 1998/12/29 18:48:17 jonas + optimize pascal code surrounding assembler blocks Revision 1.33 1998/12/23 15:16:21 jonas * change "inc x/dec x; test x, x" to "add 1, x/sub 1,x" because inc and dec don't affect the carry flag (test does). This *doesn't* fix the problem with cardinal, that's a cg issue. Revision 1.32 1998/12/16 12:09:29 jonas * fixed fistp/fild optimization Revision 1.31 1998/12/15 22:30:39 jonas + change "sub/add const1, reg" or "dec reg" followed by "sub const2, reg" to one "sub const3, reg" * some small cleaning up Revision 1.30 1998/12/15 15:43:20 jonas * fixed bug in shr/shl optimization Revision 1.29 1998/12/15 11:53:54 peter * removed commentlevel Revision 1.28 1998/12/14 22:01:45 jonas - removed $ifdef ver0_99_11's Revision 1.27 1998/12/11 00:03:35 peter + globtype,tokens,version unit splitted from globals Revision 1.26 1998/12/09 18:16:13 jonas * corrected small syntax error in part between ifdef ver0_99_11 + added fistp/fild optimization between ifdef ver0_99_11 Revision 1.25 1998/12/02 16:23:29 jonas * changed "if longintvar in set" to case or "if () or () .." statements * tree.pas: changed inlinenumber (and associated constructor/vars) to a byte Revision 1.24 1998/11/26 15:41:45 jonas + change "setxx mem; movb mem, reg8" to "setxx reg8" if mem is a local variable/parameter or function result (between $ifdef ver0_99_11) Revision 1.23 1998/11/03 16:26:09 jonas * "call x;jmp y" optimization not done anymore for P6 and equivalents * made FPU optimizations simpler and more effective Revision 1.22 1998/10/29 18:37:55 jonas + change "call x; jmp y" to "push y; jmp x" (suggestion from Daniel) Revision 1.19 1998/10/23 15:38:23 jonas + some small FPU peephole optimizations (use value in FP regs instead of loading it from memory if possible, mostly with var1+var1 and var1*var1) Revision 1.18 1998/10/05 14:41:14 jonas * fixed small memory leak * fixed small inefficiency * tested multiple line comments ability of my new MacCVS client :) Revision 1.17 1998/10/02 17:29:56 jonas + removal of "lea (reg), reg)", "imul $1, reg", change "mov reg1, reg2; mov (reg2), reg2" to "mov (reg1), reg2" Revision 1.16 1998/10/01 20:19:57 jonas * moved UpdateUsedRegs (+ bugfix) to daopt386 Revision 1.15 1998/09/30 12:18:29 peter * fixed subl $2,esp;psuhw bug Revision 1.14 1998/09/20 17:11:51 jonas * released REGALLOC Revision 1.13 1998/09/16 18:00:00 jonas * optimizer now completely dependant on GetNext/GetLast instruction, works again with -dRegAlloc Revision 1.12 1998/09/15 14:05:22 jonas * fixed optimizer incompatibilities with freelabel code in psub Revision 1.11 1998/08/28 10:57:02 peter * removed warnings Revision 1.10 1998/08/27 15:17:50 florian * reinstated Jonas' bugfix Revision 1.9 1998/08/25 16:58:59 pierre * removed a line that add no sense and introduce garbage in the asmlist (uninitialized data !) Revision 1.7 1998/08/19 16:07:53 jonas * changed optimizer switches + cleanup of DestroyRefs in daopt386.pas Revision 1.6 1998/08/10 14:50:14 peter + localswitches, moduleswitches, globalswitches splitting Revision 1.5 1998/08/06 19:40:28 jonas * removed $ before and after Log in comment Revision 1.4 1998/08/05 16:27:17 jonas * fstp/fld bugfix (fstt does not exist) Revision 1.3 1998/08/05 16:00:15 florian * some fixes for ansi strings * log to Log changed }