mirror of
git://git.gnupg.org/gnupg.git
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197 lines
3.9 KiB
ArmAsm
197 lines
3.9 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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*
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* Copyright (C) 1993, 1994, 1996, 1998,
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* 2001 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* Note: This code is heavily based on the GNU MP Library.
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* Actually it's the same code with only minor changes in the
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* way the data is stored; this is to support the abstraction
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* of an optional secure memory allocation which may be used
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* to avoid revealing of sensitive data due to paging etc.
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* The GNU MP Library itself is published under the LGPL;
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* however I decided to publish this code under the plain GPL.
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*/
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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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