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63 lines
1.5 KiB
PHP
63 lines
1.5 KiB
PHP
{
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$Id$
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This file is part of the Free Pascal run time library.
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Copyright (c) 1999-2000 by the Free Pascal development team
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This file contains some helper routines for int64 and qword
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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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.
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**********************************************************************}
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{$define FPC_SYSTEM_HAS_MUL_QWORD}
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function fpc_mul_qword(f1,f2 : qword;checkoverflow : longbool) : qword;assembler;[public,alias: 'FPC_MUL_QWORD']; {$ifdef hascompilerproc} compilerproc; {$endif}
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asm
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mov r6,#0
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// lo(f1)*lo(f2)
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umull r4,r5,r0,r2
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// lo(f1)*hi(f2)
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umlal r5,r6,r0,r3
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// overflow?
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// hi(f1)*hi(f2)
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mul r0,r1,r3
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// hi(f1)*lo(f2)
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umlal r5,r6,r1,r2
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// check for overflow
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orrs r6,r6,r0
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mov r0,r4
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mov r1,r5
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// no overflow?
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beq .Lexit
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ldr r2,checkoverflow
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cmp r2,#0
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beq .Lexit
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mov r0,#215
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mov r1,fp
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bl HandleErrorFrame
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.Lexit:
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end ['r4','r5','r6'];
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{
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$Log$
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Revision 1.4 2005-01-04 12:57:52 florian
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* fixed overflow checking for qword*qword
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Revision 1.3 2004/03/23 21:03:11 florian
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+ assembler implementation of fpc_mul_qword
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* fpu exceptions are now generated
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Revision 1.2 2004/03/14 21:45:11 florian
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* draft for qword mul
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Revision 1.1 2003/11/03 17:28:21 florian
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* initial revision
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}
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