mirror of https://github.com/ioquake/ioq3.git
100 lines
2.0 KiB
C
100 lines
2.0 KiB
C
/*
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===========================================================================
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Copyright (C) 2011 Thilo Schulz <thilo@tjps.eu>
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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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#include "qasm-inline.h"
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static const unsigned short fpucw = 0x0C7F;
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/*
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* GNU inline asm ftol conversion functions using SSE or FPU
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*/
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long qftolsse(float f)
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{
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long retval;
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__asm__ volatile
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(
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"cvttss2si %1, %0\n"
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: "=r" (retval)
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: "x" (f)
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);
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return retval;
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}
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int qvmftolsse(void)
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{
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int retval;
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__asm__ volatile
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(
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"movss (" EDI ", " EBX ", 4), %%xmm0\n"
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"cvttss2si %%xmm0, %0\n"
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: "=r" (retval)
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:
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: "%xmm0"
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);
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return retval;
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}
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long qftolx87(float f)
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{
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long retval;
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unsigned short oldcw = 0;
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__asm__ volatile
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(
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"fnstcw %2\n"
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"fldcw %3\n"
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"flds %1\n"
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"fistpl %1\n"
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"fldcw %2\n"
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"mov %1, %0\n"
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: "=r" (retval)
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: "m" (f), "m" (oldcw), "m" (fpucw)
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);
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return retval;
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}
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int qvmftolx87(void)
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{
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int retval;
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unsigned short oldcw = 0;
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__asm__ volatile
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(
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"fnstcw %1\n"
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"fldcw %2\n"
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"flds (" EDI ", " EBX ", 4)\n"
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"fistpl (" EDI ", " EBX ", 4)\n"
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"fldcw %1\n"
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"mov (" EDI ", " EBX ", 4), %0\n"
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: "=r" (retval)
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: "m" (oldcw), "m" (fpucw)
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);
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return retval;
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}
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