Initial import.

1 files changed, 103 insertions, 0 deletions

diff --git a/src/asm/snapvectora.s b/src/asm/snapvectora.s
new file mode 100644
index 0000000..11294a0
--- /dev/null
+++ b/src/asm/snapvectora.s
@@ -0,0 +1,103 @@
+/*
+===========================================================================
+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>
+
+#include "qasm.h"
+
+#if id386
+.data
+
+fpucw:  .long   0
+cw037F: .long   0x037F
+
+.text
+
+// void Sys_SnapVector( float *v )
+.globl 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 )
+.globl 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