1/* Signed 32 bit division optimized for Epiphany. 2 Copyright (C) 2009-2015 Free Software Foundation, Inc. 3 Contributed by Embecosm on behalf of Adapteva, Inc. 4 5This file is part of GCC. 6 7This file is free software; you can redistribute it and/or modify it 8under the terms of the GNU General Public License as published by the 9Free Software Foundation; either version 3, or (at your option) any 10later version. 11 12This file is distributed in the hope that it will be useful, but 13WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15General Public License for more details. 16 17Under Section 7 of GPL version 3, you are granted additional 18permissions described in the GCC Runtime Library Exception, version 193.1, as published by the Free Software Foundation. 20 21You should have received a copy of the GNU General Public License and 22a copy of the GCC Runtime Library Exception along with this program; 23see 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 (__divsi3,T_UINT) 29 .global SYM(__divsi3) 30 .balign 4 31 HIDDEN_FUNC(__divsi3) 32SYM(__divsi3): 33 float TMP2,r0 34 mov TMP4,0 35 float TMP1,r1 36 sub TMP0,TMP4,r0 37 beq .Lret_r0 38 movgt r0,TMP0 39 sub TMP0,TMP4,r1 40 movgt r1,TMP0 41 mov TMP0,1 42 sub TMP2,TMP2,TMP1 43 asr TMP3,TMP2,31 ; save sign 44 lsl TMP2,TMP2,1 45 blt .Lret0 46 sub TMP1,TMP2,1 ; rounding compensation, avoid overflow 47 movgte TMP2,TMP1 48 lsr TMP2,TMP2,24 49 lsl r1,r1,TMP2 50 lsl TMP0,TMP0,TMP2 51 sub TMP1,r0,r1 52 movgteu r0,TMP1 53 movgteu TMP4,TMP0 54 lsl TMP5,TMP0,1 55 sub TMP1,r0,r1 56 movgteu r0,TMP1 57 movgteu TMP4,TMP5 58 sub TMP1,r1,1 59 mov r1,%low(.L0step) 60 movt r1,%high(.L0step) 61 lsl TMP2,TMP2,3 62 sub r1,r1,TMP2 63 jr r1 64 .rep 30 65 lsl r0,r0,1 66 sub.l r1,r0,TMP1 67 movgteu r0,r1 68 .endr 69.L0step:sub r1,TMP0,1 ; mask result bits from steps ... 70 and r0,r0,r1 71 orr r0,r0,TMP4 ; ... and combine with first bit. 72 eor r0,r0,TMP3 ; restore sign 73 sub r0,r0,TMP3 74.Lret_r0:rts 75.Lret0: mov r0,0 76 rts 77 ENDFUNC(__divsi3) 78