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https://github.com/ReactionQuake3/reaction.git
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54 lines
1.3 KiB
ArmAsm
54 lines
1.3 KiB
ArmAsm
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Quake III Arena source code; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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//
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// math.s
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// x86 assembly-language math routines.
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#include "qasm.h"
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#if id386
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.text
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// TODO: rounding needed?
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// stack parameter offset
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#define val 4
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.globl C(Invert24To16)
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C(Invert24To16):
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movl val(%esp),%ecx
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movl $0x100,%edx // 0x10000000000 as dividend
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cmpl %edx,%ecx
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jle LOutOfRange
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subl %eax,%eax
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divl %ecx
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ret
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LOutOfRange:
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movl $0xFFFFFFFF,%eax
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ret
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#endif // id386
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