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157 lines
3 KiB
ArmAsm
157 lines
3 KiB
ArmAsm
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, 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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You should have received a copy of the GNU General Public License
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along with Quake III Arena source code; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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//
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// qftol -- fast floating point to long conversion.
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//
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// 23/09/05 Ported to gas by intel2gas, best supporting actor Tim Angus
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// <tim@ngus.net>
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#include "qasm.h"
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.data
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temp: .single 0.0
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fpucw: .long 0
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// Precision Control Field , 2 bits / 0x0300
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// PC24 0x0000 Single precision (24 bits).
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// PC53 0x0200 Double precision (53 bits).
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// PC64 0x0300 Extended precision (64 bits).
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// Rounding Control Field, 2 bits / 0x0C00
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// RCN 0x0000 Rounding to nearest (even).
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// RCD 0x0400 Rounding down (directed, minus).
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// RCU 0x0800 Rounding up (directed plus).
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// RC0 0x0C00 Rounding towards zero (chop mode).
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// rounding towards nearest (even)
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cw027F: .long 0x027F
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cw037F: .long 0x037F
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// rounding towards zero (chop mode)
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cw0E7F: .long 0x0E7F
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cw0F7F: .long 0x0F7F
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.text
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//
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// int qftol( void ) - default control word
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//
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.globl C(qftol)
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C(qftol):
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fistpl temp
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movl temp,%eax
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ret
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//
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// int qftol027F( void ) - DirectX FPU
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//
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.globl C(qftol027F)
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C(qftol027F):
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fnstcw fpucw
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fldcw cw027F
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fistpl temp
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fldcw fpucw
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movl temp,%eax
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ret
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//
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// int qftol037F( void ) - Linux FPU
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//
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.globl C(qftol037F)
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C(qftol037F):
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fnstcw fpucw
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fldcw cw037F
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fistpl temp
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fldcw fpucw
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movl temp,%eax
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ret
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//
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// int qftol0F7F( void ) - ANSI
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//
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.globl C(qftol0F7F)
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C(qftol0F7F):
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fnstcw fpucw
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fldcw cw0F7F
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fistpl temp
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fldcw fpucw
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movl temp,%eax
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ret
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//
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// int qftol0E7F( void )
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//
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.globl C(qftol0E7F)
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C(qftol0E7F):
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fnstcw fpucw
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fldcw cw0E7F
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fistpl temp
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fldcw fpucw
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movl temp,%eax
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ret
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//
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// long Q_ftol( float q )
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//
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.globl C(Q_ftol)
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C(Q_ftol):
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flds 4(%esp)
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fistpl temp
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movl temp,%eax
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ret
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//
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// long qftol0F7F( float q ) - Linux FPU
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//
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.globl C(Q_ftol0F7F)
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C(Q_ftol0F7F):
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fnstcw fpucw
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flds 4(%esp)
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fldcw cw0F7F
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fistpl temp
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fldcw fpucw
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movl temp,%eax
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ret
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