mirror of https://github.com/ioquake/ioq3.git
105 lines
2.7 KiB
ArmAsm
105 lines
2.7 KiB
ArmAsm
/*
|
|
===========================================================================
|
|
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_SnapVector_cw):
|
|
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
|