From 425decdf7e9284d15aa726e3ae96b9942fb0e3ea Mon Sep 17 00:00:00 2001 From: IronClawTrem Date: Sun, 16 Feb 2020 03:40:06 +0000 Subject: create tremded branch --- src/asm/matha.s | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 src/asm/matha.s (limited to 'src/asm/matha.s') diff --git a/src/asm/matha.s b/src/asm/matha.s new file mode 100644 index 0000000..7bdff0a --- /dev/null +++ b/src/asm/matha.s @@ -0,0 +1,55 @@ +/* +=========================================================================== +Copyright (C) 1999-2005 Id Software, Inc. +Copyright (C) 2015-2019 GrangerHub + +This file is part of Tremulous. + +Tremulous 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 3 of the License, +or (at your option) any later version. + +Tremulous 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 Tremulous; if not, see + +=========================================================================== +*/ +// +// math.s +// x86 assembly-language math routines. + +#include "qasm.h" + + +#if id386 + + .text + +// TODO: rounding needed? +// stack parameter offset +#define val 4 + +.globl C(Invert24To16) +C(Invert24To16): + + movl val(%esp),%ecx + movl $0x100,%edx // 0x10000000000 as dividend + cmpl %edx,%ecx + jle LOutOfRange + + subl %eax,%eax + divl %ecx + + ret + +LOutOfRange: + movl $0xFFFFFFFF,%eax + ret + +#endif // id386 -- cgit