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https://gitlab.com/freepascal.org/fpc/source.git
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131 lines
3.8 KiB
ObjectPascal
131 lines
3.8 KiB
ObjectPascal
{
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Copyright (c) 1998-2004 by Florian Klaempfl and David Zhang
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Generate MIPSEL assembler for in set/case nodes
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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unit ncpuset;
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{$i fpcdefs.inc}
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interface
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uses
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globtype,
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nset,
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ncgset;
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type
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tcpucasenode = class(tcgcasenode)
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protected
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procedure optimizevalues(var max_linear_list: aint; var max_dist: aword); override;
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function has_jumptable: boolean; override;
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procedure genjumptable(hp: pcaselabel; min_, max_: aint); override;
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end;
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implementation
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uses
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globals,
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systems,
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constexp,
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cpubase,
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aasmbase, aasmtai, aasmcpu, aasmdata,
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cgbase, cgutils, cgobj,
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procinfo;
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procedure tcpucasenode.optimizevalues(var max_linear_list: aint; var max_dist: aword);
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begin
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{ give the jump table a higher priority }
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max_dist := (max_dist * 3) div 2;
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end;
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function tcpucasenode.has_jumptable: boolean;
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begin
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has_jumptable := True;
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end;
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procedure tcpucasenode.genjumptable(hp: pcaselabel; min_, max_: aint);
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var
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table: tasmlabel;
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last: TConstExprInt;
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indexreg, jmpreg, basereg: tregister;
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href: treference;
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jumpsegment: TAsmlist;
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procedure genitem(t: pcaselabel);
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var
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i: aint;
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begin
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if assigned(t^.less) then
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genitem(t^.less);
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{ fill possible hole }
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for i := last.svalue+1 to t^._low.svalue-1 do
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jumpSegment.concat(Tai_const.Create_sym(elselabel));
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for i := t^._low.svalue to t^._high.svalue do
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jumpSegment.concat(Tai_const.Create_sym(blocklabel(t^.blockid)));
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last := t^._high;
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if assigned(t^.greater) then
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genitem(t^.greater);
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end;
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begin
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jumpsegment := current_procinfo.aktlocaldata;
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if not (jumptable_no_range) then
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begin
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{ case expr less than min_ => goto elselabel }
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cg.a_cmp_const_reg_label(current_asmdata.CurrAsmList, opsize, jmp_lt, aint(min_), hregister, elselabel);
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{ case expr greater than max_ => goto elselabel }
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cg.a_cmp_const_reg_label(current_asmdata.CurrAsmList, opsize, jmp_gt, aint(max_), hregister, elselabel);
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end;
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current_asmdata.getjumplabel(table);
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indexreg := cg.getaddressregister(current_asmdata.CurrAsmList);
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cg.a_op_const_reg_reg(current_asmdata.CurrAsmList, OP_SHL, OS_ADDR, 2, hregister, indexreg);
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{ create reference }
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reference_reset_symbol(href, table, 0, sizeof(aint));
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href.offset := (-aint(min_)) * 4;
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basereg := cg.getaddressregister(current_asmdata.CurrAsmList);
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cg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList, href, basereg);
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jmpreg := cg.getaddressregister(current_asmdata.CurrAsmList);
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reference_reset(href, sizeof(aint));
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href.index := indexreg;
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href.base := basereg;
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cg.a_load_ref_reg(current_asmdata.CurrAsmList, OS_ADDR, OS_ADDR, href, jmpreg);
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current_asmdata.CurrAsmList.concat(taicpu.op_reg(A_JR, jmpreg));
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{ Delay slot }
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current_asmdata.CurrAsmList.concat(taicpu.op_none(A_NOP));
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{ generate jump table }
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if not(cs_opt_size in current_settings.optimizerswitches) then
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jumpSegment.concat(Tai_Align.Create_Op(4, 0));
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jumpSegment.concat(Tai_label.Create(table));
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last := min_;
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genitem(hp);
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end;
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begin
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ccasenode := tcpucasenode;
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end.
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