mirror of
https://github.com/DrBeef/ioq3quest.git
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105 lines
2.7 KiB
ArmAsm
105 lines
2.7 KiB
ArmAsm
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/*
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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 Foobar; 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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// Sys_SnapVector NASM code (Andrew Henderson)
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// See win32/win_shared.c for the Win32 equivalent
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// This code is provided to ensure that the
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// rounding behavior (and, if necessary, the
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// precision) of DLL and QVM code are identical
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// e.g. for network-visible operations.
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// See ftol.nasm for operations on a single float,
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// as used in compiled VM and DLL code that does
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// not use this system trap.
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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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#define GLQUAKE 1 // don't include unneeded defs
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#include "qasm.h"
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#ifdef id386
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.data
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fpucw: .long 0
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cw037F: .long 0x037F
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.text
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// void Sys_SnapVector( float *v )
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.global C(Sys_SnapVector)
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C(Sys_SnapVector):
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pushl %eax
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pushl %ebp
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movl %esp,%ebp
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fnstcw fpucw
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movl 12(%ebp),%eax
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fldcw cw037F
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flds (%eax)
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fistpl (%eax)
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fildl (%eax)
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fstps (%eax)
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flds 4(%eax)
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fistpl 4(%eax)
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fildl 4(%eax)
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fstps 4(%eax)
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flds 8(%eax)
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fistpl 8(%eax)
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fildl 8(%eax)
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fstps 8(%eax)
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fldcw fpucw
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popl %ebp
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popl %eax
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ret
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// void Sys_SnapVectorCW( float *v, unsigned short int cw )
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.global C(Sys_SnapVectorCW)
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C(Sys_SnapVector_cw):
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pushl %eax
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pushl %ebp
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movl %esp,%ebp
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fnstcw fpucw
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movl 12(%ebp),%eax
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fldcw 16(%ebp)
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flds (%eax)
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fistpl (%eax)
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fildl (%eax)
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fstps (%eax)
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flds 4(%eax)
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fistpl 4(%eax)
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fildl 4(%eax)
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fstps 4(%eax)
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flds 8(%eax)
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fistpl 8(%eax)
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fildl 8(%eax)
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fstps 8(%eax)
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fldcw fpucw
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popl %ebp
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popl %eax
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ret
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#endif
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