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      1 /* Unsigned 32 bit division optimized for Epiphany.
      2    Copyright (C) 2009-2024 Free Software Foundation, Inc.
      3    Contributed by Embecosm on behalf of Adapteva, Inc.
      4 
      5 This file is part of GCC.
      6 
      7 This file is free software; you can redistribute it and/or modify it
      8 under the terms of the GNU General Public License as published by the
      9 Free Software Foundation; either version 3, or (at your option) any
     10 later version.
     11 
     12 This file is distributed in the hope that it will be useful, but
     13 WITHOUT ANY WARRANTY; without even the implied warranty of
     14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15 General Public License for more details.
     16 
     17 Under Section 7 of GPL version 3, you are granted additional
     18 permissions described in the GCC Runtime Library Exception, version
     19 3.1, as published by the Free Software Foundation.
     20 
     21 You should have received a copy of the GNU General Public License and
     22 a copy of the GCC Runtime Library Exception along with this program;
     23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     24 <http://www.gnu.org/licenses/>.  */
     25 
     26 #include "epiphany-asm.h"
     27 
     28 	FSTAB (__modsi3,T_UINT)
     29 	.global SYM(__modsi3)
     30 	.balign 4
     31 	HIDDEN_FUNC(__modsi3)
     32 SYM(__modsi3):
     33 	asr TMP3,r0,31 ; save sign
     34 	 float TMP0,r0
     35 	float TMP1,r1
     36 	 mov r2,0
     37 	sub TMP4,r2,r0
     38 	beq .Lret_r0
     39 	movgt r0,TMP4
     40 	sub TMP2,r2,r1
     41 	movlte TMP2,r1
     42 	sub r2,TMP0,TMP1
     43 	lsl r2,r2,1
     44 	blte .L0step
     45 	asr TMP4,r2,24
     46 	lsl r2,TMP4,3
     47 	mov TMP4,%low(.L0step)
     48 	movt TMP4,%high(.L0step)
     49 	sub r2,TMP4,r2
     50 	jr r2
     51 #define STEP(n) lsl.l r2,TMP2,n` sub r2,r0,r2` movgteu r0,r2
     52 	.balign 8,,2
     53 	STEP(31)` STEP(30)` STEP(29)` STEP(28)`
     54 	STEP(27)` STEP(26)` STEP(25)` STEP(24)`
     55 	STEP(23)` STEP(22)` STEP(21)` STEP(20)`
     56 	STEP(19)` STEP(18)` STEP(17)` STEP(16)`
     57 	STEP(15)` STEP(14)` STEP(13)` STEP(12)`
     58 	STEP(11)` STEP(10)` STEP(9)`  STEP(8)`
     59 	STEP(7)` STEP(6)` STEP(5)` STEP(4)` STEP(3)` STEP(2)` STEP(1)
     60 .L0step:STEP(0)
     61 	eor r0,r0,TMP3 ; restore sign
     62 	sub r0,r0,TMP3
     63 .Lret_r0:
     64 	rts
     65 	ENDFUNC(__modsi3)
     66