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+ div 2^n optimization for arm
git-svn-id: trunk@8864 -
This commit is contained in:
florian
parent
d44e928a6d
commit
c57f44d75b
@ -29,11 +29,15 @@ interface
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node,nmat,ncgmat;
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type
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tarmmoddivnode = class(tmoddivnode)
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function first_moddivint: tnode;override;
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procedure pass_generate_code;override;
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end;
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tarmnotnode = class(tcgnotnode)
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procedure second_boolean;override;
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end;
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tarmunaryminusnode = class(tcgunaryminusnode)
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procedure second_float;override;
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end;
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@ -43,15 +47,161 @@ implementation
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uses
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globtype,systems,
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cutils,verbose,globals,
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symconst,symdef,
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cutils,verbose,globals,constexp,
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aasmbase,aasmcpu,aasmtai,aasmdata,
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defutil,
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cgbase,cgobj,cgutils,
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pass_1,pass_2,procinfo,
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pass_2,procinfo,
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ncon,
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cpubase,cpuinfo,
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ncgutil,cgcpu,cg64f32,rgobj;
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cpubase,
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ncgutil,cgcpu;
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{*****************************************************************************
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TARMMODDIVNODE
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*****************************************************************************}
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function tarmmoddivnode.first_moddivint: tnode;
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var
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power : longint;
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begin
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if (right.nodetype=ordconstn) and
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(nodetype=divn) and
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ispowerof2(tordconstnode(right).value,power) and
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not(is_64bitint(resultdef)) then
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result:=nil
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else
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result:=inherited first_moddivint;
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end;
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procedure tarmmoddivnode.pass_generate_code;
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var
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power : longint;
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numerator,
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helper1,
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helper2,
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resultreg : tregister;
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size : Tcgsize;
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so : tshifterop;
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procedure genOrdConstNodeDiv;
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begin
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if tordconstnode(right).value=0 then
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internalerror(2005061701)
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else if tordconstnode(right).value=1 then
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cg.a_load_reg_reg(current_asmdata.CurrAsmList, OS_INT, OS_INT, numerator, resultreg)
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else if (tordconstnode(right).value = int64(-1)) then
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begin
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// note: only in the signed case possible..., may overflow
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current_asmdata.CurrAsmList.concat(setoppostfix(taicpu.op_reg_reg(A_MVN,
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resultreg,numerator),toppostfix(ord(cs_check_overflow in current_settings.localswitches)*ord(PF_S))));
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end
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else if ispowerof2(tordconstnode(right).value,power) then
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begin
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if (is_signed(right.resultdef)) then
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begin
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helper1:=cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
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helper2:=cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
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shifterop_reset(so);
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so.shiftmode:=SM_ASR;
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so.shiftimm:=31;
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current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg_shifterop(A_MOV,helper1,numerator,so));
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shifterop_reset(so);
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so.shiftmode:=SM_LSR;
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so.shiftimm:=32-power;
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current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg_reg_shifterop(A_ADD,helper2,numerator,helper1,so));
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shifterop_reset(so);
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so.shiftmode:=SM_ASR;
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so.shiftimm:=power;
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current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg_shifterop(A_MOV,resultreg,helper2,so));
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end
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else
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cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_SHR,OS_INT,power,numerator,resultreg)
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end;
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end;
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{
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procedure genOrdConstNodeMod;
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var
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modreg, maskreg, tempreg : tregister;
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begin
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if (tordconstnode(right).value = 0) then begin
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internalerror(2005061702);
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end
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else if (abs(tordconstnode(right).value.svalue) = 1) then
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begin
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// x mod +/-1 is always zero
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cg.a_load_const_reg(current_asmdata.CurrAsmList, OS_INT, 0, resultreg);
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end
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else if (ispowerof2(tordconstnode(right).value, power)) then
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begin
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if (is_signed(right.resultdef)) then begin
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tempreg := cg.getintregister(current_asmdata.CurrAsmList, OS_INT);
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maskreg := cg.getintregister(current_asmdata.CurrAsmList, OS_INT);
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modreg := cg.getintregister(current_asmdata.CurrAsmList, OS_INT);
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cg.a_load_const_reg(current_asmdata.CurrAsmList, OS_INT, abs(tordconstnode(right).value.svalue)-1, modreg);
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cg.a_op_const_reg_reg(current_asmdata.CurrAsmList, OP_SAR, OS_INT, 31, numerator, maskreg);
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cg.a_op_reg_reg_reg(current_asmdata.CurrAsmList, OP_AND, OS_INT, numerator, modreg, tempreg);
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current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg_reg(A_ANDC, maskreg, maskreg, modreg));
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current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg_const(A_SUBFIC, modreg, tempreg, 0));
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current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg_reg(A_SUBFE, modreg, modreg, modreg));
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cg.a_op_reg_reg_reg(current_asmdata.CurrAsmList, OP_AND, OS_INT, modreg, maskreg, maskreg);
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cg.a_op_reg_reg_reg(current_asmdata.CurrAsmList, OP_OR, OS_INT, maskreg, tempreg, resultreg);
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end else begin
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cg.a_op_const_reg_reg(current_asmdata.CurrAsmList, OP_AND, OS_INT, tordconstnode(right).value.svalue-1, numerator, resultreg);
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end;
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end else begin
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genOrdConstNodeDiv();
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cg.a_op_const_reg_reg(current_asmdata.CurrAsmList, OP_MUL, OS_INT, tordconstnode(right).value.svalue, resultreg, resultreg);
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cg.a_op_reg_reg_reg(current_asmdata.CurrAsmList, OP_SUB, OS_INT, resultreg, numerator, resultreg);
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end;
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end;
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}
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begin
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secondpass(left);
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secondpass(right);
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location_copy(location,left.location);
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{ put numerator in register }
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size:=def_cgsize(left.resultdef);
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location_force_reg(current_asmdata.CurrAsmList,left.location,
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size,true);
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location_copy(location,left.location);
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numerator:=location.register;
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resultreg:=location.register;
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if location.loc=LOC_CREGISTER then
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begin
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location.loc := LOC_REGISTER;
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location.register := cg.getintregister(current_asmdata.CurrAsmList,size);
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resultreg:=location.register;
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end
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else if (nodetype=modn) or (right.nodetype=ordconstn) then
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begin
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// for a modulus op, and for const nodes we need the result register
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// to be an extra register
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resultreg:=cg.getintregister(current_asmdata.CurrAsmList,size);
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end;
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if right.nodetype=ordconstn then
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begin
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if nodetype=divn then
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genOrdConstNodeDiv
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else
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// genOrdConstNodeMod;
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end;
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location.register:=resultreg;
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{ unsigned division/module can only overflow in case of division by zero }
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{ (but checking this overflow flag is more convoluted than performing a }
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{ simple comparison with 0) }
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if is_signed(right.resultdef) then
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cg.g_overflowcheck(current_asmdata.CurrAsmList,location,resultdef);
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end;
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{*****************************************************************************
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TARMNOTNODE
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@ -60,7 +210,6 @@ implementation
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procedure tarmnotnode.second_boolean;
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var
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hl : tasmlabel;
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ins : taicpu;
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begin
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{ if the location is LOC_JUMP, we do the secondpass after the
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labels are allocated
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@ -117,6 +266,7 @@ implementation
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begin
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cnotnode:=tarmnotnode;
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cunaryminusnode:=tarmunaryminusnode;
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cmoddivnode:=tarmmoddivnode;
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cnotnode:=tarmnotnode;
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cunaryminusnode:=tarmunaryminusnode;
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end.
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