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/* Signed 32 bit modulo optimized for Epiphany.

   Copyright (C) 2009 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

.  */

#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)