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91 lines
3.2 KiB
ObjectPascal
91 lines
3.2 KiB
ObjectPascal
{
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Copyright (c) 2015 by Jonas Maebe
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This unit implements llvm support for some basic 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 nllvmbas;
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{$i fpcdefs.inc}
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interface
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uses
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nbas,ncgbas;
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type
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tllvmtempinfoaccessor = class(ttempinfoaccessor)
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protected
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class procedure settempinfoflags(tempinfo: ptempinfo; const flags: ttempinfoflags); override;
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end;
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tllvmtempcreatenode = class(tcgtempcreatenode)
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procedure pass_generate_code;override;
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end;
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implementation
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uses
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aasmdata,
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cgbase,cgutils,
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llvmbase,aasmllvm
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;
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{*****************************************************************************
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TLLVMTEMPINFOACCESSOR
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*****************************************************************************}
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class procedure tllvmtempinfoaccessor.settempinfoflags(tempinfo: ptempinfo; const flags: ttempinfoflags);
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begin
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{ it is not possible to typecast between e.g. an integer and a record
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in a register, which is a problem if such a typecast is performed on
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an lvalue (since we then have to store it first to a temp in memory,
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which means we no longer have an lvalue).
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Disable regvars altogether since LLVM will put the values in registers
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anyway if possible/useful. }
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inherited settempinfoflags(tempinfo,flags-[ti_may_be_in_reg]);
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end;
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{*****************************************************************************
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TTEMPCREATENODE
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*****************************************************************************}
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procedure tllvmtempcreatenode.pass_generate_code;
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begin
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inherited;
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{ if a temp is in a register and we never assign anything to it (e.g.
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because it's the register for an inlined function result that never
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gets assigned a value), then llvm will be confused the first time
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we try to read from it (since it's never been defined) -> always
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immediately assign undef to such registers }
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if tempinfo^.location.loc in [LOC_REGISTER,LOC_CREGISTER,LOC_FPUREGISTER,
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LOC_CFPUREGISTER,LOC_MMREGISTER,LOC_CMMREGISTER] then
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current_asmdata.CurrAsmList.concat(
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taillvm.op_reg_size_undef(la_bitcast,tempinfo^.location.register,tempinfo^.typedef)
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);
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end;
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begin
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ctempinfoaccessor:=tllvmtempinfoaccessor;
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ctempcreatenode:=tllvmtempcreatenode;
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end.
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