From 952c5c128f9efaea89d41d882c4ea3ade7df4591 Mon Sep 17 00:00:00 2001
From: zakk <zakk@edf5b092-35ff-0310-97b2-ce42778d08ea>
Date: Fri, 26 Aug 2005 04:48:05 +0000
Subject: Itsa me, quake3io!

git-svn-id: svn://svn.icculus.org/quake3/trunk@2 edf5b092-35ff-0310-97b2-ce42778d08ea
---
 code/unix/ftol.nasm | 151 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100755 code/unix/ftol.nasm

(limited to 'code/unix/ftol.nasm')

diff --git a/code/unix/ftol.nasm b/code/unix/ftol.nasm
new file mode 100755
index 0000000..772e6a0
--- /dev/null
+++ b/code/unix/ftol.nasm
@@ -0,0 +1,151 @@
+;===========================================================================
+;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
+;===========================================================================
+
+;
+; qftol -- fast floating point to long conversion.
+;
+
+segment .data
+
+temp    dd 0.0
+fpucw   dd 0
+
+; Precision Control Field , 2 bits / 0x0300 
+; PC24 0x0000   Single precision (24 bits). 
+; PC53 0x0200   Double precision (53 bits). 
+; PC64 0x0300   Extended precision (64 bits).
+
+; Rounding Control Field, 2 bits / 0x0C00
+; RCN  0x0000   Rounding to nearest (even). 
+; RCD  0x0400   Rounding down (directed, minus). 
+; RCU  0x0800   Rounding up (directed plus).
+; RC0  0x0C00   Rounding towards zero (chop mode).
+
+
+; rounding towards nearest (even)
+cw027F  dd 0x027F ; double precision
+cw037F  dd 0x037F ; extended precision
+
+; rounding towards zero (chop mode)
+cw0E7F  dd 0x0E7F ; double precision
+cw0F7F  dd 0x0F7F ; extended precision
+
+
+segment .text
+
+;
+; int qftol( void ) - default control word
+;
+
+global qftol
+
+qftol: 
+        fistp dword [temp]
+        mov eax, [temp]
+        ret
+
+
+;
+; int qftol027F( void ) - DirectX FPU 
+;
+
+global qftol027F
+
+qftol027F:
+	fnstcw [fpucw]
+	fldcw  [cw027F]  
+        fistp dword [temp]
+	fldcw  [fpucw]
+        mov eax, [temp]
+        ret
+
+;
+; int qftol037F( void ) - Linux FPU 
+;
+
+global qftol037F
+
+qftol037F:
+	fnstcw [fpucw]
+	fldcw  [cw037F]  
+        fistp dword [temp]
+	fldcw  [fpucw]
+        mov eax, [temp]
+        ret
+
+
+;
+; int qftol0F7F( void ) - ANSI
+;
+
+global qftol0F7F
+
+qftol0F7F:
+	fnstcw [fpucw]
+	fldcw  [cw0F7F]  
+        fistp dword [temp]
+	fldcw  [fpucw]
+        mov eax, [temp]
+        ret
+
+;
+; int qftol0E7F( void ) 
+;
+
+global qftol0E7F
+
+qftol0E7F:
+	fnstcw [fpucw]
+	fldcw  [cw0E7F]  
+        fistp dword [temp]
+	fldcw  [fpucw]
+        mov eax, [temp]
+        ret
+
+
+
+;
+; long Q_ftol( float q )
+;
+
+global Q_ftol
+
+Q_ftol:
+        fld dword [esp+4]  
+        fistp dword [temp]
+        mov eax, [temp]
+        ret
+
+
+;
+; long qftol0F7F( float q ) - Linux FPU 
+;
+
+global Q_ftol0F7F
+
+Q_ftol0F7F:
+	fnstcw [fpucw]
+	fld dword [esp+4]  
+	fldcw  [cw0F7F]  
+        fistp dword [temp]
+	fldcw  [fpucw]
+        mov eax, [temp]
+        ret
+
-- 
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