diff options
Diffstat (limited to 'gcc-4.9/libgcc/config/epiphany/udivsi3.S')
| -rw-r--r-- | gcc-4.9/libgcc/config/epiphany/udivsi3.S | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/gcc-4.9/libgcc/config/epiphany/udivsi3.S b/gcc-4.9/libgcc/config/epiphany/udivsi3.S new file mode 100644 index 000000000..3c994aa41 --- /dev/null +++ b/gcc-4.9/libgcc/config/epiphany/udivsi3.S @@ -0,0 +1,85 @@ +/* Unsigned 32 bit division optimized for Epiphany. + Copyright (C) 2009-2014 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 (__udivsi3,T_UINT) + .global SYM(__udivsi3) + .balign 4 + HIDDEN_FUNC(__udivsi3) +SYM(__udivsi3): + sub r3,r0,r1 + bltu .Lret0 + mov r3,0x95 + lsl r12,r3,23 ; 0x4a800000 + lsl r3,r3,30 ; 0x40000000 + orr r16,r0,r3 + orr r2,r1,r3 + fsub r16,r16,r3 + fsub r2,r2,r3 + lsr r3,r1,21 + lsr r17,r0,21 + movt r17,0x4a80 + fsub r17,r17,r12 + movt r3,0x4a80 + fsub r3,r3,r12 + mov r12,%low(.L0step) + movt r12,%high(.L0step) + mov r21,1 + movne r16,r17 + lsr r17,r1,21 + movne r2,r3 + lsr r3,r16,23 ; must mask lower bits of r2 in case op0 was .. + lsr r2,r2,23 ; .. shifted and op1 was not. + sub r3,r3,r2 ; calculate bit number difference. + lsl r1,r1,r3 + lsr r16,r1,1 + lsl r2,r21,r3 + lsl r3,r3,3 + sub r12,r12,r3 + sub r3,r0,r1 + movltu r3,r0 + mov r0,0 + movgteu r0,r2 + lsr r2,r2,1 + add r17,r2,r0 + sub r1,r3,r16 + movgteu r3,r1 + movgteu r0,r17 + sub r16,r16,1 + jr r12 + .rep 30 + lsl r3,r3,1 + sub r1,r3,r16 + movgteu r3,r1 + .endr + sub r2,r2,1 ; mask result bits from steps ... + and r3,r3,r2 + orr r0,r0,r3 ; ... and combine with first bits. + nop +.L0step:rts +.Lret0: mov r0,0 + rts + ENDFUNC(__udivsi3) |