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189 lines
3.5 KiB
ArmAsm
189 lines
3.5 KiB
ArmAsm
! SPARC v7 __udiv_qrnnd division support, used from longlong.h.
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! This is for v7 CPUs without a floating-point unit.
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! Copyright (C) 1993, 1994, 1996 Free Software Foundation, Inc.
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! This file is part of the GNU MP Library.
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! The GNU MP Library is free software; you can redistribute it and/or modify
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! it under the terms of the GNU Library General Public License as published by
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! the Free Software Foundation; either version 2 of the License, or (at your
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! option) any later version.
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! The GNU MP Library is distributed in the hope that it will be useful, but
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! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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! or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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! License for more details.
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! You should have received a copy of the GNU Library General Public License
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! along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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! the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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! MA 02111-1307, USA.
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! INPUT PARAMETERS
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! rem_ptr o0
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! n1 o1
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! n0 o2
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! d o3
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#include "sysdep.h"
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.text
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.align 4
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.global C_SYMBOL_NAME(__udiv_qrnnd)
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C_SYMBOL_NAME(__udiv_qrnnd):
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tst %o3
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bneg Largedivisor
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mov 8,%g1
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b Lp1
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addxcc %o2,%o2,%o2
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Lplop: bcc Ln1
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addxcc %o2,%o2,%o2
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Lp1: addx %o1,%o1,%o1
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subcc %o1,%o3,%o4
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bcc Ln2
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addxcc %o2,%o2,%o2
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Lp2: addx %o1,%o1,%o1
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subcc %o1,%o3,%o4
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bcc Ln3
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addxcc %o2,%o2,%o2
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Lp3: addx %o1,%o1,%o1
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subcc %o1,%o3,%o4
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bcc Ln4
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addxcc %o2,%o2,%o2
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Lp4: addx %o1,%o1,%o1
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addcc %g1,-1,%g1
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bne Lplop
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subcc %o1,%o3,%o4
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bcc Ln5
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addxcc %o2,%o2,%o2
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Lp5: st %o1,[%o0]
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retl
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xnor %g0,%o2,%o0
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Lnlop: bcc Lp1
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addxcc %o2,%o2,%o2
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Ln1: addx %o4,%o4,%o4
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subcc %o4,%o3,%o1
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bcc Lp2
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addxcc %o2,%o2,%o2
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Ln2: addx %o4,%o4,%o4
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subcc %o4,%o3,%o1
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bcc Lp3
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addxcc %o2,%o2,%o2
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Ln3: addx %o4,%o4,%o4
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subcc %o4,%o3,%o1
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bcc Lp4
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addxcc %o2,%o2,%o2
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Ln4: addx %o4,%o4,%o4
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addcc %g1,-1,%g1
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bne Lnlop
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subcc %o4,%o3,%o1
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bcc Lp5
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addxcc %o2,%o2,%o2
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Ln5: st %o4,[%o0]
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retl
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xnor %g0,%o2,%o0
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Largedivisor:
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and %o2,1,%o5 ! %o5 = n0 & 1
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srl %o2,1,%o2
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sll %o1,31,%g2
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or %g2,%o2,%o2 ! %o2 = lo(n1n0 >> 1)
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srl %o1,1,%o1 ! %o1 = hi(n1n0 >> 1)
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and %o3,1,%g2
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srl %o3,1,%g3 ! %g3 = floor(d / 2)
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add %g3,%g2,%g3 ! %g3 = ceil(d / 2)
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b LLp1
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addxcc %o2,%o2,%o2
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LLplop: bcc LLn1
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addxcc %o2,%o2,%o2
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LLp1: addx %o1,%o1,%o1
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subcc %o1,%g3,%o4
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bcc LLn2
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addxcc %o2,%o2,%o2
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LLp2: addx %o1,%o1,%o1
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subcc %o1,%g3,%o4
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bcc LLn3
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addxcc %o2,%o2,%o2
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LLp3: addx %o1,%o1,%o1
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subcc %o1,%g3,%o4
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bcc LLn4
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addxcc %o2,%o2,%o2
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LLp4: addx %o1,%o1,%o1
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addcc %g1,-1,%g1
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bne LLplop
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subcc %o1,%g3,%o4
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bcc LLn5
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addxcc %o2,%o2,%o2
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LLp5: add %o1,%o1,%o1 ! << 1
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tst %g2
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bne Oddp
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add %o5,%o1,%o1
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st %o1,[%o0]
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retl
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xnor %g0,%o2,%o0
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LLnlop: bcc LLp1
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addxcc %o2,%o2,%o2
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LLn1: addx %o4,%o4,%o4
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subcc %o4,%g3,%o1
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bcc LLp2
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addxcc %o2,%o2,%o2
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LLn2: addx %o4,%o4,%o4
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subcc %o4,%g3,%o1
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bcc LLp3
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addxcc %o2,%o2,%o2
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LLn3: addx %o4,%o4,%o4
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subcc %o4,%g3,%o1
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bcc LLp4
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addxcc %o2,%o2,%o2
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LLn4: addx %o4,%o4,%o4
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addcc %g1,-1,%g1
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bne LLnlop
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subcc %o4,%g3,%o1
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bcc LLp5
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addxcc %o2,%o2,%o2
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LLn5: add %o4,%o4,%o4 ! << 1
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tst %g2
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bne Oddn
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add %o5,%o4,%o4
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st %o4,[%o0]
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retl
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xnor %g0,%o2,%o0
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Oddp: xnor %g0,%o2,%o2
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! q' in %o2. r' in %o1
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addcc %o1,%o2,%o1
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bcc LLp6
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addx %o2,0,%o2
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sub %o1,%o3,%o1
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LLp6: subcc %o1,%o3,%g0
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bcs LLp7
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subx %o2,-1,%o2
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sub %o1,%o3,%o1
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LLp7: st %o1,[%o0]
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retl
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mov %o2,%o0
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Oddn: xnor %g0,%o2,%o2
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! q' in %o2. r' in %o4
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addcc %o4,%o2,%o4
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bcc LLn6
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addx %o2,0,%o2
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sub %o4,%o3,%o4
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LLn6: subcc %o4,%o3,%g0
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bcs LLn7
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subx %o2,-1,%o2
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sub %o4,%o3,%o4
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LLn7: st %o4,[%o0]
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retl
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mov %o2,%o0
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