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fc21845686
the stack pointer during the prolog. This was done previously in
tcg.g_proc_entry(), but that routine is called after register allocation
and hence has no influence. Also cleaned up the deallocation of that
register by moving the previously ifdef'd code to thlcgppcgen
(mantis #27634)
git-svn-id: trunk@30164 -
102 lines
3.3 KiB
ObjectPascal
102 lines
3.3 KiB
ObjectPascal
{
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Copyright (c) 1998-2010 by Florian Klaempfl and Jonas Maebe
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Member of the Free Pascal development team
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This unit contains routines high-level code generator support shared by
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ppc32 and ppc64
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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 hlcgppc;
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{$mode objfpc}
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interface
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uses
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aasmdata,
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symtype,
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cgbase,cgutils,hlcgobj,hlcg2ll;
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type
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thlcgppcgen = class(thlcg2ll)
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protected
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procedure a_load_subsetref_regs_noindex(list: TAsmList; subsetsize: tdef; loadbitsize: byte; const sref: tsubsetreference; valuereg, extra_value_reg: tregister); override;
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public
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procedure gen_load_para_value(list: TAsmList); override;
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end;
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implementation
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uses
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cpubase,globtype,
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procinfo,cpupi,
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symdef,defutil;
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{ thlcgppc }
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procedure thlcgppcgen.a_load_subsetref_regs_noindex(list: TAsmList; subsetsize: tdef; loadbitsize: byte; const sref: tsubsetreference; valuereg, extra_value_reg: tregister);
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var
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fromsreg, tosreg: tsubsetregister;
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restbits: byte;
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begin
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restbits:=(sref.bitlen-(loadbitsize-sref.startbit));
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if is_signed(subsetsize) then
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begin
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{ sign extend }
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a_op_const_reg(list,OP_SHL,osuinttype,AIntBits-loadbitsize+sref.startbit,valuereg);
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a_op_const_reg(list,OP_SAR,osuinttype,AIntBits-sref.bitlen,valuereg);
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end
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else
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begin
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a_op_const_reg(list,OP_SHL,osuinttype,restbits,valuereg);
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{ mask other bits }
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if (sref.bitlen<>AIntBits) then
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a_op_const_reg(list,OP_AND,osuinttype,(aword(1) shl sref.bitlen)-1,valuereg);
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end;
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{ use subsetreg routine, it may have been overridden with an optimized version }
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fromsreg.subsetreg:=extra_value_reg;
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fromsreg.subsetregsize:=OS_INT;
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{ subsetregs always count bits from right to left }
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fromsreg.startbit:=loadbitsize-restbits;
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fromsreg.bitlen:=restbits;
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tosreg.subsetreg:=valuereg;
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tosreg.subsetregsize:=OS_INT;
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tosreg.startbit:=0;
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tosreg.bitlen:=restbits;
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a_load_subsetreg_subsetreg(list,subsetsize,subsetsize,fromsreg,tosreg);
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end;
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procedure thlcgppcgen.gen_load_para_value(list: TAsmList);
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begin
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{ get the register that contains the stack pointer before the procedure
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entry, which is used to access the parameters in their original
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callee-side location }
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if (tppcprocinfo(current_procinfo).needs_frame_pointer) then
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getcpuregister(list,NR_OLD_STACK_POINTER_REG);
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inherited;
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{ free it again }
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if (tppcprocinfo(current_procinfo).needs_frame_pointer) then
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ungetcpuregister(list,NR_OLD_STACK_POINTER_REG);
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end;
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end.
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