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- {
- $Id$
- Copyright (c) 1998-2002 by Florian Klaempfl and Carl Eric Codere
- Generate generic assembler for in set/case nodes
- 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 ncgset;
- {$i fpcdefs.inc}
- interface
- uses
- globtype,globals,
- node,nset,cpubase,cgbase,cgobj,aasmbase,aasmtai;
- type
- tcgsetelementnode = class(tsetelementnode)
- procedure pass_2;override;
- end;
- tcginnode = class(tinnode)
- procedure pass_2;override;
- protected
- {# Routine to test bitnumber in bitnumber register on value
- in value register. The __result register should be set
- to one if the bit is set, otherwise __result register
- should be set to zero.
- Should be overriden on processors which have specific
- instructions to do bit tests.
- }
- procedure emit_bit_test_reg_reg(list : taasmoutput;
- bitsize: tcgsize; bitnumber,value : tregister;
- ressize: tcgsize; res :tregister);virtual;
- end;
- tcgcasenode = class(tcasenode)
- {
- Emits the case node statement. Contrary to the intel
- 80x86 version, this version does not emit jump tables,
- because of portability problems.
- }
- procedure pass_2;override;
- protected
- with_sign : boolean;
- opsize : tcgsize;
- jmp_gt,jmp_lt,jmp_le : topcmp;
- { register with case expression }
- hregister,hregister2 : tregister;
- endlabel,elselabel : tasmlabel;
- { true, if we can omit the range check of the jump table }
- jumptable_no_range : boolean;
- { has the implementation jumptable support }
- min_label : tconstexprint;
- procedure optimizevalues(var max_linear_list:aint;var max_dist:aword);virtual;
- function has_jumptable : boolean;virtual;
- procedure genjumptable(hp : pcaserecord;min_,max_ : aint); virtual;
- procedure genlinearlist(hp : pcaserecord); virtual;
- procedure genlinearcmplist(hp : pcaserecord); virtual;
- procedure gentreejmp(p : pcaserecord);
- end;
- implementation
- uses
- systems,
- verbose,
- symconst,symdef,defutil,
- paramgr,
- pass_2,
- nbas,ncon,nflw,
- ncgutil,regvars,cpuinfo,
- cgutils;
- {*****************************************************************************
- TCGSETELEMENTNODE
- *****************************************************************************}
- procedure tcgsetelementnode.pass_2;
- begin
- { load first value in 32bit register }
- secondpass(left);
- if left.location.loc in [LOC_REGISTER,LOC_CREGISTER] then
- location_force_reg(exprasmlist,left.location,OS_32,false);
- { also a second value ? }
- if assigned(right) then
- begin
- secondpass(right);
- if codegenerror then
- exit;
- if right.location.loc in [LOC_REGISTER,LOC_CREGISTER] then
- location_force_reg(exprasmlist,right.location,OS_32,false);
- end;
- { we doesn't modify the left side, we check only the type }
- location_copy(location,left.location);
- end;
- {*****************************************************************************
- *****************************************************************************}
- {**********************************************************************}
- { Description: Emit operation to do a bit test, where the bitnumber }
- { to test is in the bitnumber register. The value to test against is }
- { located in the value register. }
- { WARNING: Bitnumber register value is DESTROYED! }
- { __Result register is set to 1, if the bit is set otherwise, __Result}
- { is set to zero. __RESULT register is also used as scratch. }
- {**********************************************************************}
- procedure tcginnode.emit_bit_test_reg_reg(list : taasmoutput;
- bitsize: tcgsize; bitnumber,value : tregister;
- ressize: tcgsize; res :tregister);
- var
- newres: tregister;
- begin
- { first make sure that the bit number is modulo 32 }
- { not necessary, since if it's > 31, we have a range error -> will }
- { be caught when range checking is on! (JM) }
- { cg.a_op_const_reg(list,OP_AND,31,bitnumber); }
- if bitsize<>ressize then
- begin
- { FIX ME! We're not allowed to modify the value register here! }
- { shift value register "bitnumber" bits to the right }
- cg.a_op_reg_reg(list,OP_SHR,bitsize,bitnumber,value);
- { extract the bit we want }
- cg.a_op_const_reg(list,OP_AND,bitsize,1,value);
- cg.a_load_reg_reg(list,bitsize,ressize,value,res);
- end
- else
- begin
- { rotate value register "bitnumber" bits to the right }
- cg.a_op_reg_reg_reg(list,OP_SHR,bitsize,bitnumber,value,res);
- { extract the bit we want }
- cg.a_op_const_reg(list,OP_AND,bitsize,1,res);
- end;
- end;
- procedure tcginnode.pass_2;
- type
- Tsetpart=record
- range : boolean; {Part is a range.}
- start,stop : byte; {Start/stop when range; Stop=element when an element.}
- end;
- var
- l,l3 : tasmlabel;
- adjustment : aint;
- href : treference;
- hr,hr2,
- pleftreg : tregister;
- setparts : array[1..8] of Tsetpart;
- opsize : tcgsize;
- genjumps,
- use_small : boolean;
- i,numparts : byte;
- function analizeset(const Aset:Tconstset;is_small:boolean):boolean;
- var
- compares,maxcompares:word;
- i:byte;
- begin
- analizeset:=false;
- numparts:=0;
- compares:=0;
- { Lots of comparisions take a lot of time, so do not allow
- too much comparisions. 8 comparisions are, however, still
- smalller than emitting the set }
- if cs_littlesize in aktglobalswitches then
- maxcompares:=8
- else
- maxcompares:=5;
- { when smallset is possible allow only 3 compares the smallset
- code is for littlesize also smaller when more compares are used }
- if is_small then
- maxcompares:=3;
- for i:=0 to 255 do
- if i in Aset then
- begin
- if (numparts=0) or (i<>setparts[numparts].stop+1) then
- begin
- {Set element is a separate element.}
- inc(compares);
- if compares>maxcompares then
- exit;
- inc(numparts);
- setparts[numparts].range:=false;
- setparts[numparts].stop:=i;
- end
- else
- {Set element is part of a range.}
- if not setparts[numparts].range then
- begin
- {Transform an element into a range.}
- setparts[numparts].range:=true;
- setparts[numparts].start:=setparts[numparts].stop;
- setparts[numparts].stop:=i;
- { there's only one compare per range anymore. Only a }
- { sub is added, but that's much faster than a }
- { cmp/jcc combo so neglect its effect }
- { inc(compares);
- if compares>maxcompares then
- exit; }
- end
- else
- begin
- {Extend a range.}
- setparts[numparts].stop:=i;
- end;
- end;
- analizeset:=true;
- end;
- begin
- { We check first if we can generate jumps, this can be done
- because the resulttype.def is already set in firstpass }
- { check if we can use smallset operation using btl which is limited
- to 32 bits, the left side may also not contain higher values !! }
- use_small:=(tsetdef(right.resulttype.def).settype=smallset) and
- ((left.resulttype.def.deftype=orddef) and (torddef(left.resulttype.def).high<=32) or
- (left.resulttype.def.deftype=enumdef) and (tenumdef(left.resulttype.def).max<=32));
- { Can we generate jumps? Possible for all types of sets }
- genjumps:=(right.nodetype=setconstn) and
- analizeset(Tsetconstnode(right).value_set^,use_small);
- opsize:=OS_32;
- { calculate both operators }
- { the complex one first }
- firstcomplex(self);
- secondpass(left);
- { Only process the right if we are not generating jumps }
- if not genjumps then
- secondpass(right);
- if codegenerror then
- exit;
- { ofcourse not commutative }
- if nf_swaped in flags then
- swapleftright;
- { location is always LOC_JUMP }
- location_reset(location,LOC_REGISTER,def_cgsize(resulttype.def));
- if genjumps then
- begin
- { allocate a register for the result }
- location.register := cg.getintregister(exprasmlist,location.size);
- { Get a label to jump to the end }
- objectlibrary.getlabel(l);
- { clear the register value, indicating result is FALSE }
- cg.a_load_const_reg(exprasmlist,location.size,0,location.register);
- { If register is used, use only lower 8 bits }
- location_force_reg(exprasmlist,left.location,opsize,false);
- pleftreg := left.location.register;
- { how much have we already substracted from the x in the }
- { "x in [y..z]" expression }
- adjustment := 0;
- hr:=NR_NO;
- for i:=1 to numparts do
- if setparts[i].range then
- { use fact that a <= x <= b <=> aword(x-a) <= aword(b-a) }
- begin
- { is the range different from all legal values? }
- if (setparts[i].stop-setparts[i].start <> 255) then
- begin
- { yes, is the lower bound <> 0? }
- if (setparts[i].start <> 0) then
- { we're going to substract from the left register, }
- { so in case of a LOC_CREGISTER first move the value }
- { to edi (not done before because now we can do the }
- { move and substract in one instruction with LEA) }
- if (left.location.loc = LOC_CREGISTER) and
- (hr<>pleftreg) then
- begin
- cg.a_op_const_reg(exprasmlist,OP_SUB,opsize,setparts[i].start,pleftreg);
- hr:=cg.getintregister(exprasmlist,opsize);
- cg.a_load_reg_reg(exprasmlist,opsize,opsize,pleftreg,hr);
- pleftreg:=hr;
- end
- else
- begin
- { otherwise, the value is already in a register }
- { that can be modified }
- cg.a_op_const_reg(exprasmlist,OP_SUB,opsize,
- setparts[i].start-adjustment,pleftreg)
- end;
- { new total value substracted from x: }
- { adjustment + (setparts[i].start - adjustment) }
- adjustment := setparts[i].start;
- { check if result < b-a+1 (not "result <= b-a", since }
- { we need a carry in case the element is in the range }
- { (this will never overflow since we check at the }
- { beginning whether stop-start <> 255) }
- cg.a_cmp_const_reg_label(exprasmlist, opsize, OC_B,
- setparts[i].stop-setparts[i].start+1,pleftreg,l);
- end
- else
- { if setparts[i].start = 0 and setparts[i].stop = 255, }
- { it's always true since "in" is only allowed for bytes }
- begin
- cg.a_jmp_always(exprasmlist,l);
- end;
- end
- else
- begin
- { Emit code to check if left is an element }
- cg.a_cmp_const_reg_label(exprasmlist, opsize, OC_EQ,
- setparts[i].stop-adjustment,pleftreg,l);
- end;
- { To compensate for not doing a second pass }
- right.location.reference.symbol:=nil;
- objectlibrary.getlabel(l3);
- cg.a_jmp_always(exprasmlist,l3);
- { Now place the end label if IN success }
- cg.a_label(exprasmlist,l);
- { result register is 1 }
- cg.a_load_const_reg(exprasmlist,location.size,1,location.register);
- { in case value is not found }
- cg.a_label(exprasmlist,l3);
- case left.location.loc of
- LOC_CREGISTER :
- cg.ungetregister(exprasmlist,pleftreg);
- LOC_REGISTER :
- cg.ungetregister(exprasmlist,pleftreg);
- else
- begin
- reference_release(exprasmlist,left.location.reference);
- cg.ungetregister(exprasmlist,pleftreg);
- end;
- end;
- end
- else
- {*****************************************************************}
- { NO JUMP TABLE GENERATION }
- {*****************************************************************}
- begin
- { We will now generated code to check the set itself, no jmps,
- handle smallsets separate, because it allows faster checks }
- if use_small then
- begin
- {**************************** SMALL SET **********************}
- if left.nodetype=ordconstn then
- begin
- location_force_reg(exprasmlist,right.location,opsize,true);
- location.register:=cg.getintregister(exprasmlist,location.size);
- { first SHR the register }
- cg.a_op_const_reg_reg(exprasmlist,OP_SHR,opsize,tordconstnode(left).value and 31,right.location.register,location.register);
- { then extract the lowest bit }
- cg.a_op_const_reg(exprasmlist,OP_AND,opsize,1,location.register);
- end
- else
- begin
- location_force_reg(exprasmlist,left.location,opsize,false);
- location_force_reg(exprasmlist,right.location,opsize,true);
- { allocate a register for the result }
- location.register:=cg.getintregister(exprasmlist,location.size);
- { emit bit test operation }
- emit_bit_test_reg_reg(exprasmlist,left.location.size,left.location.register,
- right.location.register,location.size,location.register);
- end;
- location_release(exprasmlist,left.location);
- location_release(exprasmlist,right.location);
- end
- else
- {************************** NOT SMALL SET ********************}
- begin
- if right.location.loc=LOC_CONSTANT then
- begin
- { can it actually occur currently? CEC }
- { yes: "if bytevar in [1,3,5,7,9,11,13,15]" (JM) }
- { note: this code assumes that left in [0..255], which is a valid }
- { assumption (other cases will be caught by range checking) (JM) }
- { load left in register }
- location_force_reg(exprasmlist,left.location,opsize,true);
- if left.location.loc = LOC_CREGISTER then
- hr := cg.getintregister(exprasmlist,opsize)
- else
- hr := left.location.register;
- { load right in register }
- hr2:=cg.getintregister(exprasmlist,opsize);
- cg.a_load_const_reg(exprasmlist,opsize,right.location.value,hr2);
- { emit bit test operation }
- emit_bit_test_reg_reg(exprasmlist,left.location.size,left.location.register,hr2,opsize,hr2);
- { if left > 31 then hr := 0 else hr := $ffffffff }
- cg.a_op_const_reg_reg(exprasmlist,OP_SUB,opsize,32,left.location.register,hr);
- cg.a_op_const_reg(exprasmlist,OP_SAR,opsize,31,hr);
- { free registers }
- cg.ungetregister(exprasmlist,hr2);
- if (left.location.loc in [LOC_CREGISTER]) then
- cg.ungetregister(exprasmlist,hr)
- else
- cg.ungetregister(exprasmlist,left.location.register);
- { if left > 31, then result := 0 else result := result of bit test }
- cg.a_op_reg_reg(exprasmlist,OP_AND,opsize,hr,hr2);
- { allocate a register for the result }
- location.register := cg.getintregister(exprasmlist,location.size);
- cg.a_load_reg_reg(exprasmlist,opsize,location.size,hr2,location.register);
- end { of right.location.loc=LOC_CONSTANT }
- { do search in a normal set which could have >32 elementsm
- but also used if the left side contains higher values > 32 }
- else if left.nodetype=ordconstn then
- begin
- { use location.register as scratch register here }
- if (target_info.endian = endian_little) then
- inc(right.location.reference.offset,tordconstnode(left).value shr 3)
- else
- { adjust for endianess differences }
- inc(right.location.reference.offset,(tordconstnode(left).value shr 3) xor 3);
- { allocate a register for the result }
- location.register := cg.getintregister(exprasmlist,location.size);
- cg.a_load_ref_reg(exprasmlist,OS_8,location.size,right.location.reference, location.register);
- location_release(exprasmlist,right.location);
- cg.a_op_const_reg(exprasmlist,OP_SHR,location.size,tordconstnode(left).value and 7,
- location.register);
- cg.a_op_const_reg(exprasmlist,OP_AND,location.size,1,location.register);
- end
- else
- begin
- location_force_reg(exprasmlist,left.location,OS_INT,true);
- pleftreg := left.location.register;
- location_freetemp(exprasmlist,left.location);
- hr := cg.getaddressregister(exprasmlist);
- cg.a_op_const_reg_reg(exprasmlist,OP_SHR,OS_INT,5,pleftreg,hr);
- cg.a_op_const_reg(exprasmlist,OP_SHL,OS_INT,2,hr);
- href := right.location.reference;
- if (href.base = NR_NO) then
- href.base := hr
- else if (right.location.reference.index = NR_NO) then
- href.index := hr
- else
- begin
- reference_release(exprasmlist,href);
- hr2 := cg.getaddressregister(exprasmlist);
- cg.a_loadaddr_ref_reg(exprasmlist,href, hr2);
- reference_reset_base(href,hr2,0);
- href.index := hr;
- end;
- reference_release(exprasmlist,href);
- { allocate a register for the result }
- location.register := cg.getintregister(exprasmlist,opsize);
- cg.a_load_ref_reg(exprasmlist,opsize,opsize,href,location.register);
- cg.ungetregister(exprasmlist,pleftreg);
- hr := cg.getintregister(exprasmlist,opsize);
- cg.a_op_const_reg_reg(exprasmlist,OP_AND,opsize,31,pleftreg,hr);
- cg.a_op_reg_reg(exprasmlist,OP_SHR,opsize,hr,location.register);
- cg.ungetregister(exprasmlist,hr);
- cg.a_op_const_reg(exprasmlist,OP_AND,opsize,1,location.register);
- end;
- end;
- end;
- location_freetemp(exprasmlist,right.location);
- end;
- {*****************************************************************************
- TCGCASENODE
- *****************************************************************************}
- procedure tcgcasenode.optimizevalues(var max_linear_list:aint;var max_dist:aword);
- begin
- { no changes by default }
- end;
- function tcgcasenode.has_jumptable : boolean;
- begin
- { No jumptable support in the default implementation }
- has_jumptable:=false;
- end;
- procedure tcgcasenode.genjumptable(hp : pcaserecord;min_,max_ : aint);
- begin
- internalerror(200209161);
- end;
- procedure tcgcasenode.genlinearlist(hp : pcaserecord);
- var
- first : boolean;
- last : TConstExprInt;
- scratch_reg: tregister;
- procedure genitem(t : pcaserecord);
- procedure gensub(value:aint);
- begin
- { here, since the sub and cmp are separate we need
- to move the result before subtract to a help
- register.
- }
- cg.a_load_reg_reg(exprasmlist, opsize, opsize, hregister, scratch_reg);
- cg.a_op_const_reg(exprasmlist, OP_SUB, opsize, value, hregister);
- end;
- begin
- if assigned(t^.less) then
- genitem(t^.less);
- { need we to test the first value }
- if first and (t^._low>get_min_value(left.resulttype.def)) then
- begin
- cg.a_cmp_const_reg_label(exprasmlist,opsize,jmp_lt,t^._low,hregister,elselabel);
- end;
- if t^._low=t^._high then
- begin
- if t^._low-last=0 then
- cg.a_cmp_const_reg_label(exprasmlist, opsize, OC_EQ,0,hregister,t^.statement)
- else
- begin
- gensub(aint(t^._low-last));
- cg.a_cmp_const_reg_label(exprasmlist, opsize, OC_EQ,aint(t^._low-last),scratch_reg,t^.statement);
- end;
- last:=t^._low;
- end
- else
- begin
- { it begins with the smallest label, if the value }
- { is even smaller then jump immediately to the }
- { ELSE-label }
- if first then
- begin
- { have we to ajust the first value ? }
- if (t^._low>get_min_value(left.resulttype.def)) then
- gensub(aint(t^._low));
- end
- else
- begin
- { if there is no unused label between the last and the }
- { present label then the lower limit can be checked }
- { immediately. else check the range in between: }
- gensub(aint(t^._low-last));
- cg.a_cmp_const_reg_label(exprasmlist, opsize,jmp_lt,aint(t^._low-last),scratch_reg,elselabel);
- end;
- gensub(aint(t^._high-t^._low));
- cg.a_cmp_const_reg_label(exprasmlist, opsize,jmp_le,aint(t^._high-t^._low),scratch_reg,t^.statement);
- last:=t^._high;
- end;
- first:=false;
- if assigned(t^.greater) then
- genitem(t^.greater);
- end;
- begin
- { do we need to generate cmps? }
- if (with_sign and (min_label<0)) then
- genlinearcmplist(hp)
- else
- begin
- last:=0;
- first:=true;
- scratch_reg:=cg.getintregister(exprasmlist,opsize);
- genitem(hp);
- cg.ungetregister(exprasmlist,scratch_reg);
- cg.a_jmp_always(exprasmlist,elselabel);
- end;
- end;
- procedure tcgcasenode.genlinearcmplist(hp : pcaserecord);
- var
- first : boolean;
- last : TConstExprInt;
- procedure genitem(t : pcaserecord);
- {$ifndef cpu64bit}
- var
- l1 : tasmlabel;
- {$endif cpu64bit}
- begin
- if assigned(t^.less) then
- genitem(t^.less);
- if t^._low=t^._high then
- begin
- {$ifndef cpu64bit}
- if opsize in [OS_S64,OS_64] then
- begin
- objectlibrary.getlabel(l1);
- cg.a_cmp_const_reg_label(exprasmlist, OS_32, OC_NE, aint(hi(int64(t^._low))),hregister2,l1);
- cg.a_cmp_const_reg_label(exprasmlist, OS_32, OC_EQ, aint(lo(int64(t^._low))),hregister, t^.statement);
- cg.a_label(exprasmlist,l1);
- end
- else
- {$endif cpu64bit}
- begin
- cg.a_cmp_const_reg_label(exprasmlist, opsize, OC_EQ, aint(t^._low),hregister, t^.statement);
- end;
- { Reset last here, because we've only checked for one value and need to compare
- for the next range both the lower and upper bound }
- last:=0;
- end
- else
- begin
- { it begins with the smallest label, if the value }
- { is even smaller then jump immediately to the }
- { ELSE-label }
- if first or (t^._low-last>1) then
- begin
- {$ifndef cpu64bit}
- if opsize in [OS_64,OS_S64] then
- begin
- objectlibrary.getlabel(l1);
- cg.a_cmp_const_reg_label(exprasmlist, OS_32, jmp_lt, aint(hi(int64(t^._low))),
- hregister2, elselabel);
- cg.a_cmp_const_reg_label(exprasmlist, OS_32, jmp_gt, aint(hi(int64(t^._low))),
- hregister2, l1);
- { the comparisation of the low dword must be always unsigned! }
- cg.a_cmp_const_reg_label(exprasmlist, OS_32, OC_B, aint(lo(int64(t^._low))), hregister, elselabel);
- cg.a_label(exprasmlist,l1);
- end
- else
- {$endif cpu64bit}
- begin
- cg.a_cmp_const_reg_label(exprasmlist, opsize, jmp_lt, aint(t^._low), hregister,
- elselabel);
- end;
- end;
- {$ifndef cpu64bit}
- if opsize in [OS_S64,OS_64] then
- begin
- objectlibrary.getlabel(l1);
- cg.a_cmp_const_reg_label(exprasmlist, OS_32, jmp_lt, aint(hi(int64(t^._high))), hregister2,
- t^.statement);
- cg.a_cmp_const_reg_label(exprasmlist, OS_32, jmp_gt, aint(hi(int64(t^._high))), hregister2,
- l1);
- cg.a_cmp_const_reg_label(exprasmlist, OS_32, OC_BE, aint(lo(int64(t^._high))), hregister, t^.statement);
- cg.a_label(exprasmlist,l1);
- end
- else
- {$endif cpu64bit}
- begin
- cg.a_cmp_const_reg_label(exprasmlist, opsize, jmp_le, aint(t^._high), hregister, t^.statement);
- end;
- last:=t^._high;
- end;
- first:=false;
- if assigned(t^.greater) then
- genitem(t^.greater);
- end;
- begin
- last:=0;
- first:=true;
- genitem(hp);
- cg.a_jmp_always(exprasmlist,elselabel);
- end;
- procedure tcgcasenode.gentreejmp(p : pcaserecord);
- var
- lesslabel,greaterlabel : tasmlabel;
- begin
- cg.a_label(exprasmlist,p^._at);
- { calculate labels for left and right }
- if (p^.less=nil) then
- lesslabel:=elselabel
- else
- lesslabel:=p^.less^._at;
- if (p^.greater=nil) then
- greaterlabel:=elselabel
- else
- greaterlabel:=p^.greater^._at;
- { calculate labels for left and right }
- { no range label: }
- if p^._low=p^._high then
- begin
- if greaterlabel=lesslabel then
- begin
- cg.a_cmp_const_reg_label(exprasmlist, opsize, OC_NE,p^._low,hregister, lesslabel);
- end
- else
- begin
- cg.a_cmp_const_reg_label(exprasmlist,opsize, jmp_lt,p^._low,hregister, lesslabel);
- cg.a_cmp_const_reg_label(exprasmlist,opsize, jmp_gt,p^._low,hregister, greaterlabel);
- end;
- cg.a_jmp_always(exprasmlist,p^.statement);
- end
- else
- begin
- cg.a_cmp_const_reg_label(exprasmlist,opsize,jmp_lt,p^._low, hregister, lesslabel);
- cg.a_cmp_const_reg_label(exprasmlist,opsize,jmp_gt,p^._high,hregister, greaterlabel);
- cg.a_jmp_always(exprasmlist,p^.statement);
- end;
- if assigned(p^.less) then
- gentreejmp(p^.less);
- if assigned(p^.greater) then
- gentreejmp(p^.greater);
- end;
- procedure ReLabel(var p:tasmsymbol);
- begin
- if p.defbind = AB_LOCAL then
- begin
- if not assigned(p.altsymbol) then
- objectlibrary.GenerateAltSymbol(p);
- p:=p.altsymbol;
- p.increfs;
- end;
- end;
- procedure relabelcaserecord(p : pcaserecord);
- begin
- Relabel(p^.statement);
- Relabel(p^._at);
- if assigned(p^.greater) then
- relabelcaserecord(p^.greater);
- if assigned(p^.less) then
- relabelcaserecord(p^.less);
- end;
- procedure tcgcasenode.pass_2;
- var
- lv,hv,
- max_label: tconstexprint;
- labels : aint;
- max_linear_list : aint;
- otl, ofl: tasmlabel;
- isjump : boolean;
- max_dist,
- dist : aword;
- hp : tstatementnode;
- relabeling: boolean;
- begin
- location_reset(location,LOC_VOID,OS_NO);
- { Relabel for inlining? }
- relabeling := false;
- if assigned(nodes) and
- (nodes^.statement.getrefs <> 0) then
- begin
- objectlibrary.CreateUsedAsmSymbolList;
- relabelcaserecord(nodes);
- relabeling := true;
- end;
- objectlibrary.getlabel(endlabel);
- objectlibrary.getlabel(elselabel);
- with_sign:=is_signed(left.resulttype.def);
- if with_sign then
- begin
- jmp_gt:=OC_GT;
- jmp_lt:=OC_LT;
- jmp_le:=OC_LTE;
- end
- else
- begin
- jmp_gt:=OC_A;
- jmp_lt:=OC_B;
- jmp_le:=OC_BE;
- end;
- { save current truelabel and falselabel }
- isjump:=false;
- if left.location.loc=LOC_JUMP then
- begin
- otl:=truelabel;
- objectlibrary.getlabel(truelabel);
- ofl:=falselabel;
- objectlibrary.getlabel(falselabel);
- isjump:=true;
- end;
- secondpass(left);
- { determines the size of the operand }
- opsize:=def_cgsize(left.resulttype.def);
- { copy the case expression to a register }
- location_force_reg(exprasmlist,left.location,opsize,false);
- {$ifndef cpu64bit}
- if opsize in [OS_S64,OS_64] then
- begin
- hregister:=left.location.registerlow;
- hregister2:=left.location.registerhigh;
- end
- else
- {$endif cpu64bit}
- hregister:=left.location.register;
- if isjump then
- begin
- truelabel:=otl;
- falselabel:=ofl;
- end;
- { we need the min_label always to choose between }
- { cmps and subs/decs }
- min_label:=case_get_min(nodes);
- {$ifdef OLDREGVARS}
- load_all_regvars(exprasmlist);
- {$endif OLDREGVARS}
- { now generate the jumps }
- {$ifndef cpu64bit}
- if opsize in [OS_64,OS_S64] then
- genlinearcmplist(nodes)
- else
- {$endif cpu64bit}
- begin
- if cs_optimize in aktglobalswitches then
- begin
- { procedures are empirically passed on }
- { consumption can also be calculated }
- { but does it pay on the different }
- { processors? }
- { moreover can the size only be appro- }
- { ximated as it is not known if rel8, }
- { rel16 or rel32 jumps are used }
- max_label:=case_get_max(nodes);
- labels:=case_count_labels(nodes);
- { can we omit the range check of the jump table ? }
- getrange(left.resulttype.def,lv,hv);
- jumptable_no_range:=(lv=min_label) and (hv=max_label);
- { hack a little bit, because the range can be greater }
- { than the positive range of a aint }
- if (min_label<0) and (max_label>0) then
- begin
- if min_label=TConstExprInt(low(aint)) then
- dist:=aword(max_label)+aword(low(aint))
- else
- dist:=aword(max_label)+aword(-min_label)
- end
- else
- dist:=max_label-min_label;
- { optimize for size ? }
- if cs_littlesize in aktglobalswitches then
- begin
- if (has_jumptable) and
- not((labels<=2) or
- ((max_label-min_label)<0) or
- ((max_label-min_label)>3*labels)) then
- begin
- { if the labels less or more a continuum then }
- genjumptable(nodes,min_label,max_label);
- end
- else
- begin
- { a linear list is always smaller than a jump tree }
- genlinearlist(nodes);
- end;
- end
- else
- begin
- max_dist:=4*aword(labels);
- if jumptable_no_range then
- max_linear_list:=4
- else
- max_linear_list:=2;
- { allow processor specific values }
- optimizevalues(max_linear_list,max_dist);
- if (labels<=max_linear_list) then
- genlinearlist(nodes)
- else
- begin
- if (has_jumptable) and
- (dist<max_dist) then
- genjumptable(nodes,min_label,max_label)
- else
- begin
- {
- This one expects that the case labels are a
- perfectly balanced tree, which is not the case
- very often -> generates really bad code (JM)
- if labels>16 then
- gentreejmp(nodes)
- else
- }
- genlinearlist(nodes);
- end;
- end;
- end;
- end
- else
- { it's always not bad }
- genlinearlist(nodes);
- end;
- cg.ungetregister(exprasmlist,hregister);
- { now generate the instructions }
- hp:=tstatementnode(right);
- while assigned(hp) do
- begin
- { relabel when inlining }
- if relabeling then
- begin
- if hp.left.nodetype<>labeln then
- internalerror(200211261);
- Relabel(tlabelnode(hp.left).labelnr);
- end;
- secondpass(hp.left);
- { don't come back to case line }
- aktfilepos:=exprasmList.getlasttaifilepos^;
- {$ifdef OLDREGVARS}
- load_all_regvars(exprasmlist);
- {$endif OLDREGVARS}
- cg.a_jmp_always(exprasmlist,endlabel);
- hp:=tstatementnode(hp.right);
- end;
- cg.a_label(exprasmlist,elselabel);
- { ...and the else block }
- if assigned(elseblock) then
- begin
- secondpass(elseblock);
- {$ifdef OLDREGVARS}
- load_all_regvars(exprasmlist);
- {$endif OLDREGVARS}
- end;
- cg.a_label(exprasmlist,endlabel);
- { Remove relabels for inlining }
- if relabeling and
- assigned(nodes) then
- begin
- { restore used symbols }
- objectlibrary.UsedAsmSymbolListResetAltSym;
- objectlibrary.DestroyUsedAsmSymbolList;
- end;
- end;
- begin
- csetelementnode:=tcgsetelementnode;
- cinnode:=tcginnode;
- ccasenode:=tcgcasenode;
- end.
- {
- $Log$
- Revision 1.65 2004-07-22 10:07:09 jonas
- * fixed relabeling (nextaltnr was never increased)
- * fixed inlining of case statements at the node level
- Revision 1.64 2004/07/04 12:38:55 jonas
- * fixed regvar bug in tcginnode.pass_2
- Revision 1.63 2004/06/20 08:55:29 florian
- * logs truncated
- Revision 1.62 2004/06/16 20:07:08 florian
- * dwarf branch merged
- Revision 1.61 2004/05/30 21:18:22 jonas
- * some optimizations and associated fixes for better regvar code
- Revision 1.60.2.5 2004/05/02 16:49:12 peter
- * 64 bit fixes
- Revision 1.60.2.4 2004/05/02 14:09:54 peter
- * fix case 64bit issues
- Revision 1.60.2.3 2004/05/01 16:02:09 peter
- * POINTER_SIZE replaced with sizeof(aint)
- * aint,aword,tconst*int moved to globtype
- }
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