78 lines
2.2 KiB
ArmAsm
78 lines
2.2 KiB
ArmAsm
/* Signed 32 bit modulo 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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FSTAB (__modsi3,T_INT)
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.global SYM(__modsi3)
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.balign 4
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HIDDEN_FUNC(__modsi3)
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SYM(__modsi3):
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asr r17,r0,31 ; save sign
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mov r2,0
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sub r3,r2,r0
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movgt r0,r3
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sub r3,r2,r1
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movgt r1,r3
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movt r2,0xa000 ; 0xa0000000
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orr r3,r2,r0
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lsr r15,r0,16
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movt r15,0xa800
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movne r3,r15
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lsr r16,r2,2 ; 0x28000000
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and r15,r3,r16
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fadd r12,r3,r15
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orr r3,r2,r1
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lsr r2,r1,16
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movt r2,0xa800
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movne r3,r2
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and r2,r16,r3
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fadd r3,r3,r2
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sub r2,r0,r1
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bltu .Lret_a
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lsr r12,r12,23
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mov r2,%low(.L0step)
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movt r2,%high(.L0step)
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lsr r3,r3,23
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sub r3,r12,r3 ; calculate bit number difference.
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lsl r3,r3,3
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sub r2,r2,r3
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jr r2
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/* lsl_l r2,r1,n` sub r2,r0,r2` movgteu r0,r2 */
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#define STEP(n) .long 0x0006441f | (n) << 5` 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_a:eor r0,r0,r17 ; restore sign
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sub r0,r0,r17
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rts
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ENDFUNC(__modsi3)
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