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90 lines
2.1 KiB
PHP
90 lines
2.1 KiB
PHP
{
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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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{$if (not defined(CPUTHUMB)) and defined(CPUARM_HAS_UMULL)}
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{$define FPC_SYSTEM_HAS_MUL_QWORD}
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function fpc_mul_qword(f1,f2 : qword) : qword;assembler;nostackframe;[public,alias: 'FPC_MUL_QWORD']; compilerproc;
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asm
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stmfd sp!,{r4,r5,r6,r14}
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mov r6,#0
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// r4 = result lo, r5 = result hi
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{$ifdef ENDIAN_LITTLE}
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// lo(f1)*lo(f2)
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umull r4,r5,r0,r2
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// lo(f1)*hi(f2)
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umlal r5,r6,r0,r3
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// hi(f1)*lo(f2)
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umlal r5,r6,r1,r2
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mov r0,r4
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mov r1,r5
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{$else}
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// lo(f1)*lo(f2)
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umull r4,r5,r1,r3
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// lo(f1)*hi(f2)
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umlal r5,r6,r1,r2
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// hi(f1)*lo(f2)
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umlal r5,r6,r0,r3
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mov r1,r4
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mov r0,r5
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{$endif}
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ldmfd sp!,{r4,r5,r6,r15}
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end;
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function fpc_mul_qword_checkoverflow(f1,f2 : qword) : qword;assembler;nostackframe;[public,alias: 'FPC_MUL_QWORD_CHECKOVERFLOW']; compilerproc;
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asm
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stmfd sp!,{r4,r5,r6,r14}
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mov r6,#0
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// r4 = result lo, r5 = result hi
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{$ifdef ENDIAN_LITTLE}
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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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{$else}
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// lo(f1)*lo(f2)
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umull r4,r5,r1,r3
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// lo(f1)*hi(f2)
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umlal r5,r6,r1,r2
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// overflow?
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// hi(f1)*hi(f2)
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mul r1,r0,r2
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// hi(f1)*lo(f2)
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umlal r5,r6,r0,r3
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// check for overflow
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orrs r6,r6,r1
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mov r1,r4
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mov r0,r5
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{$endif}
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// no overflow?
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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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ldmfd sp!,{r4,r5,r6,r15}
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end;
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{$endif (not defined(CPUTHUMB)) and defined(CPUARM_HAS_UMULL)}
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