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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Quake III Arena source code.
Quake III Arena source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
Quake III Arena source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
//
// Sys_SnapVector NASM code (Andrew Henderson)
// See win32/win_shared.c for the Win32 equivalent
// This code is provided to ensure that the
// rounding behavior (and, if necessary, the
// precision) of DLL and QVM code are identical
// e.g. for network-visible operations.
// See ftol.nasm for operations on a single float,
// as used in compiled VM and DLL code that does
// not use this system trap.
//
// 23/09/05 Ported to gas by intel2gas, best supporting actor Tim Angus
// <tim@ngus.net>
#define GLQUAKE 1 // don't include unneeded defs
#include "qasm.h"
#ifdef id386
.data
fpucw: .long 0
cw037F: .long 0x037F
.text
// void Sys_SnapVector( float *v )
.global C(Sys_SnapVector)
C(Sys_SnapVector):
pushl %eax
pushl %ebp
movl %esp,%ebp
fnstcw fpucw
movl 12(%ebp),%eax
fldcw cw037F
flds (%eax)
fistpl (%eax)
fildl (%eax)
fstps (%eax)
flds 4(%eax)
fistpl 4(%eax)
fildl 4(%eax)
fstps 4(%eax)
flds 8(%eax)
fistpl 8(%eax)
fildl 8(%eax)
fstps 8(%eax)
fldcw fpucw
popl %ebp
popl %eax
ret
// void Sys_SnapVectorCW( float *v, unsigned short int cw )
.global C(Sys_SnapVectorCW)
C(Sys_SnapVectorCW):
pushl %eax
pushl %ebp
movl %esp,%ebp
fnstcw fpucw
movl 12(%ebp),%eax
fldcw 16(%ebp)
flds (%eax)
fistpl (%eax)
fildl (%eax)
fstps (%eax)
flds 4(%eax)
fistpl 4(%eax)
fildl 4(%eax)
fstps 4(%eax)
flds 8(%eax)
fistpl 8(%eax)
fildl 8(%eax)
fstps 8(%eax)
fldcw fpucw
popl %ebp
popl %eax
ret
#endif
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