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54 lines
1.5 KiB
ObjectPascal
54 lines
1.5 KiB
ObjectPascal
{
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Copyright (c) 2019 by Jonas Maebe
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Generate LLVM bytecode for 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 nllvmset;
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{$i fpcdefs.inc}
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interface
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uses
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nset, ncgset;
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type
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tllvmcasenode = class(tcgcasenode)
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protected
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procedure genlinearlist(hp: pcaselabel); override;
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end;
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implementation
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procedure tllvmcasenode.genlinearlist(hp: pcaselabel);
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begin
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{ genlinearlist constantly updates the case value in the register,
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which causes tons of spilling with LLVM due to the need to bring
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it back into SSA form. LLVM will recognise and optimise the linear
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cmp list just as well (or even better), while the code that FPC
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has to generate is much smaller (no spilling) }
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genlinearcmplist(hp);
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end;
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begin
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ccasenode:=tllvmcasenode;
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end.
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