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      1 /* Unsigned 32 bit modulo 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 (__umodsi3,T_UINT)
     29 	.global SYM(__umodsi3)
     30 	.balign 4
     31 	HIDDEN_FUNC(__umodsi3)
     32 SYM(__umodsi3):
     33 	mov r2,5
     34 	lsl r2,r2,29 ; 0xa0000000
     35 	orr r3,r2,r0
     36 	lsr r15,r0,16
     37 	movt r15,0xa800
     38 	movne r3,r15
     39 	lsr r16,r2,2 ; 0x28000000
     40 	and r15,r3,r16
     41 	fadd r12,r3,r15
     42 	 orr r3,r2,r1
     43 	lsr r2,r1,16
     44 	movt r2,0xa800
     45 	movne r3,r2
     46 	and r2,r16,r3
     47 	fadd r3,r3,r2
     48 	 sub r2,r0,r1
     49 	bltu .Lret_a
     50 	lsr r12,r12,23
     51 	mov r2,%low(.L0step)
     52 	movt r2,%high(.L0step)
     53 	lsr r3,r3,23
     54 	sub r3,r12,r3 ; calculate bit number difference.
     55 	lsl r3,r3,3
     56 	sub r2,r2,r3
     57 	jr r2
     58 /*              lsl_l r2,r1,n`               sub r2,r0,r2` movgteu r0,r2  */
     59 #define STEP(n) .long 0x0006441f | (n) << 5` sub r2,r0,r2` movgteu r0,r2
     60 	.balign 8,,2
     61 	STEP(31)` STEP(30)` STEP(29)` STEP(28)`
     62 	STEP(27)` STEP(26)` STEP(25)` STEP(24)`
     63 	STEP(23)` STEP(22)` STEP(21)` STEP(20)`
     64 	STEP(19)` STEP(18)` STEP(17)` STEP(16)`
     65 	STEP(15)` STEP(14)` STEP(13)` STEP(12)`
     66 	STEP(11)` STEP(10)` STEP(9)`  STEP(8)`
     67 	STEP(7)` STEP(6)` STEP(5)` STEP(4)` STEP(3)` STEP(2)` STEP(1)
     68 .L0step:STEP(0)
     69 .Lret_a:rts
     70 	ENDFUNC(__umodsi3)
     71