78 lines
2.2 KiB
ArmAsm
78 lines
2.2 KiB
ArmAsm
/* Signed 32 bit modulo optimized for Epiphany.
|
|
Copyright (C) 2009-2013 Free Software Foundation, Inc.
|
|
Contributed by Embecosm on behalf of Adapteva, Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
This file is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by the
|
|
Free Software Foundation; either version 3, or (at your option) any
|
|
later version.
|
|
|
|
This file is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include "epiphany-asm.h"
|
|
|
|
FSTAB (__modsi3,T_INT)
|
|
.global SYM(__modsi3)
|
|
.balign 4
|
|
HIDDEN_FUNC(__modsi3)
|
|
SYM(__modsi3):
|
|
asr r17,r0,31 ; save sign
|
|
mov r2,0
|
|
sub r3,r2,r0
|
|
movgt r0,r3
|
|
sub r3,r2,r1
|
|
movgt r1,r3
|
|
movt r2,0xa000 ; 0xa0000000
|
|
orr r3,r2,r0
|
|
lsr r15,r0,16
|
|
movt r15,0xa800
|
|
movne r3,r15
|
|
lsr r16,r2,2 ; 0x28000000
|
|
and r15,r3,r16
|
|
fadd r12,r3,r15
|
|
orr r3,r2,r1
|
|
lsr r2,r1,16
|
|
movt r2,0xa800
|
|
movne r3,r2
|
|
and r2,r16,r3
|
|
fadd r3,r3,r2
|
|
sub r2,r0,r1
|
|
bltu .Lret_a
|
|
lsr r12,r12,23
|
|
mov r2,%low(.L0step)
|
|
movt r2,%high(.L0step)
|
|
lsr r3,r3,23
|
|
sub r3,r12,r3 ; calculate bit number difference.
|
|
lsl r3,r3,3
|
|
sub r2,r2,r3
|
|
jr r2
|
|
/* lsl_l r2,r1,n` sub r2,r0,r2` movgteu r0,r2 */
|
|
#define STEP(n) .long 0x0006441f | (n) << 5` sub r2,r0,r2` movgteu r0,r2
|
|
.balign 8,,2
|
|
STEP(31)` STEP(30)` STEP(29)` STEP(28)`
|
|
STEP(27)` STEP(26)` STEP(25)` STEP(24)`
|
|
STEP(23)` STEP(22)` STEP(21)` STEP(20)`
|
|
STEP(19)` STEP(18)` STEP(17)` STEP(16)`
|
|
STEP(15)` STEP(14)` STEP(13)` STEP(12)`
|
|
STEP(11)` STEP(10)` STEP(9)` STEP(8)`
|
|
STEP(7)` STEP(6)` STEP(5)` STEP(4)` STEP(3)` STEP(2)` STEP(1)
|
|
.L0step:STEP(0)
|
|
.Lret_a:eor r0,r0,r17 ; restore sign
|
|
sub r0,r0,r17
|
|
rts
|
|
ENDFUNC(__modsi3)
|