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https://github.com/autc04/Retro68.git
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86 lines
2.1 KiB
ArmAsm
86 lines
2.1 KiB
ArmAsm
/* Copyright (C) 2008-2018 Free Software Foundation, Inc.
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Contributor: Joern Rennecke <joern.rennecke@embecosm.com>
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on behalf of Synopsys Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "arc-ieee-754.h"
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#if 0 /* DEBUG */
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FUNC(__fixdfsi)
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.global __fixdfsi
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.balign 4
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__fixdfsi:
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push_s blink
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push_s r0
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bl.d __fixdfsi_c
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push_s r1
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mov_s r2,r0
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pop_s r1
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ld r0,[sp]
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bl.d __fixdfsi_asm
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st r2,[sp]
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pop_s r1
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pop_s blink
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cmp r0,r1
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jeq_s [blink]
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bl abort
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ENDFUNC(__fixdfsi)
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#define __fixdfsi __fixdfsi_asm
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#endif /* DEBUG */
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/* If the fraction has to be shifted left by a positive non-zero amount,
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we have to combine bits from DBL0L and DBL0H. If we shift right,
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or shift by zero, we only want to have the bits from DBL0H in r0. */
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.global __fixdfsi
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FUNC(__fixdfsi)
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.balign 4
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__fixdfsi:
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bbit0 DBL0H,30,.Lret0or1
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asr r2,DBL0H,20
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bmsk_s DBL0H,DBL0H,19
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sub_s r2,r2,19; 0x3ff+20-0x400
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neg_s r3,r2
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asr.f 0,r3,11
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bset_s DBL0H,DBL0H,20
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#ifdef __LITTLE_ENDIAN__
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mov.cs DBL0L,DBL0H
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asl DBL0H,DBL0H,r2
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#else
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asl.cc DBL0H,DBL0H,r2
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lsr.cs DBL0H,DBL0H,r3
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#endif
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lsr_s DBL0L,DBL0L,r3
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add.cc r0,r0,r1
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j_s.d [blink]
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neg.pl r0,r0
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.Lret0or1:
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add.f r0,DBL0H,0x100000
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lsr_s r0,r0,30
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bmsk_s r0,r0,0
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j_s.d [blink]
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neg.mi r0,r0
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ENDFUNC(__fixdfsi)
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