66 lines
1.9 KiB
ArmAsm
66 lines
1.9 KiB
ArmAsm
/* Unsigned 32 bit division optimized for Epiphany.
|
|
Copyright (C) 2009-2017 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_UINT)
|
|
.global SYM(__modsi3)
|
|
.balign 4
|
|
HIDDEN_FUNC(__modsi3)
|
|
SYM(__modsi3):
|
|
asr TMP3,r0,31 ; save sign
|
|
float TMP0,r0
|
|
float TMP1,r1
|
|
mov r2,0
|
|
sub TMP4,r2,r0
|
|
beq .Lret_r0
|
|
movgt r0,TMP4
|
|
sub TMP2,r2,r1
|
|
movlte TMP2,r1
|
|
sub r2,TMP0,TMP1
|
|
lsl r2,r2,1
|
|
blte .L0step
|
|
asr TMP4,r2,24
|
|
lsl r2,TMP4,3
|
|
mov TMP4,%low(.L0step)
|
|
movt TMP4,%high(.L0step)
|
|
sub r2,TMP4,r2
|
|
jr r2
|
|
#define STEP(n) lsl.l r2,TMP2,n` 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)
|
|
eor r0,r0,TMP3 ; restore sign
|
|
sub r0,r0,TMP3
|
|
.Lret_r0:
|
|
rts
|
|
ENDFUNC(__modsi3)
|