64 lines
2.1 KiB
ArmAsm
64 lines
2.1 KiB
ArmAsm
/* Unsigned 32 bit division optimized for Epiphany.
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Copyright (C) 2009-2020 Free Software Foundation, Inc.
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Contributed by Embecosm on behalf of Adapteva, Inc.
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This file is part of GCC.
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "epiphany-asm.h"
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/* Because we handle a divident with bit 31 set with truncating integer
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arithmetic, there is no rounding-related overflow. */
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FSTAB (__umodsi3,T_UINT)
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.global SYM(__umodsi3)
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.balign 4
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HIDDEN_FUNC(__umodsi3)
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SYM(__umodsi3):
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float r2,r0
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mov TMP1,%low(0xb0800000) ; ??? this would be faster with small data
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float TMP2,r1
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movt TMP1,%high(0xb0800000)
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asr TMP0,r0,8
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sub TMP0,TMP0,TMP1
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mov TMP1,%low(.L0step)
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movgteu r2,TMP0
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sub r2,r2,TMP2
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blteu .L0step
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asr r2,r2,23
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movt TMP1,%high(.L0step)
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lsl TMP2,r2,3
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lsl r2,r1,r2` sub r2,r0,r2` movgteu r0,r2 ; STEP(r2)
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sub r2,TMP1,TMP2
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jr r2
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#define STEP(n) lsl.l r2,r1,n` sub r2,r0,r2` movgteu r0,r2
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.balign 8,,2
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STEP(31)` STEP(30)` STEP(29)` STEP(28)`
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STEP(27)` STEP(26)` STEP(25)` STEP(24)`
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STEP(23)` STEP(22)` STEP(21)` STEP(20)`
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STEP(19)` STEP(18)` STEP(17)` STEP(16)`
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STEP(15)` STEP(14)` STEP(13)` STEP(12)`
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STEP(11)` STEP(10)` STEP(9)` STEP(8)`
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STEP(7)` STEP(6)` STEP(5)` STEP(4)` STEP(3)` STEP(2)` STEP(1)
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.L0step:STEP(0)
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.Lret_r0:
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rts
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ENDFUNC(__umodsi3)
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