quakeforge/libs/video/renderer/sw/fpua.S

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/*
sw_fpua.S
Intel 32-bit assembly language dependent routines.
Copyright (C) 1996-1997 Id Software, Inc.
This program 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.
This program 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 this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "asm_i386.h"
#ifdef USE_INTEL_ASM
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#ifdef _WIN32
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# undef PIC //no such thing in win32
#endif
.data
.align 4
fpenv:
.long 0, 0, 0, 0, 0, 0, 0, 0
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#ifdef PIC
#define got_base(n) \
call .Lpic##n ;\
.Lpic##n: ;\
popl %edx ;\
addl $C(_GLOBAL_OFFSET_TABLE_)+[.-.Lpic##n],%edx
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#define got_var(v) v@GOTOFF(%edx)
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#define F_BEGIN(name) \
.globl C(name) ;\
.type C(name),@function ;\
C(name):
#define F_END(name) .size C(name),.-C(name)
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#else
#define got_base(n)
#define got_var(v) v
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#define F_BEGIN(name) \
.globl C(name) ;\
C(name):
#define F_END(name)
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#endif
.text
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F_BEGIN(MaskExceptions)
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got_base(1)
fnstenv got_var(fpenv)
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orl $0x3F,got_var(fpenv)
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fldenv got_var(fpenv)
ret
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F_END(MaskExceptions)
#if 0
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F_BEGIN(unmaskexceptions)
got_base(2)
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fnstenv got_var(fpenv)
andl $0xFFFFFFE0,got_var(fpenv)
fldenv got_var(fpenv)
ret
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F_END(unmaskexceptions)
#endif
.data
.align 4
.globl C(ceil_cw), C(single_cw), C(full_cw), C(cw), C(pushed_cw)
C(ceil_cw): .long 0
C(single_cw): .long 0
C(full_cw): .long 0
C(cw): .long 0
C(pushed_cw): .long 0
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#ifdef PIC
.type C(ceil_cw),@object
.type C(single_cw),@object
.type C(full_cw),@object
.type C(cw),@object
.type C(pushed_cw),@object
.size C(ceil_cw),4
.size C(single_cw),4
.size C(full_cw),4
.size C(cw),4
.size C(pushed_cw),4
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#endif
.text
F_BEGIN(R_LowFPPrecision)
got_base(3)
fldcw got_var(C(single_cw))
ret
F_END(R_LowFPPrecision)
F_BEGIN(R_HighFPPrecision)
got_base(4)
fldcw got_var(C(full_cw))
ret
F_END(R_HighFPPrecision)
F_BEGIN(R_SetFPCW)
got_base(7)
fnstcw got_var(C(cw))
movl got_var(C(cw)),%eax
andb $0xF0,%ah
orb $0x03,%ah // round mode, 64-bit precision
movl %eax,got_var(C(full_cw))
andb $0xF0,%ah
orb $0x0C,%ah // chop mode, single precision
movl %eax,got_var(C(single_cw))
andb $0xF0,%ah
orb $0x08,%ah // ceil mode, single precision
movl %eax,got_var(C(ceil_cw))
ret
F_END(R_SetFPCW)
#endif /* USE_INTEL_ASM */