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/////////////////////////////////////////////////////////////////////////
// $Id: fpu_const.cc,v 1.7 2006/03/06 22:03:04 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2003 Stanislav Shwartsman
// Written by Stanislav Shwartsman <stl at fidonet.org.il>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
/////////////////////////////////////////////////////////////////////////
#define NEED_CPU_REG_SHORTCUTS 1
#include "bochs.h"
#include "cpu/cpu.h"
#define LOG_THIS BX_CPU_THIS_PTR
#if BX_SUPPORT_FPU
#include "softfloatx80.h"
const floatx80 Const_QNaN = packFloatx80(0, floatx80_default_nan_exp, floatx80_default_nan_fraction);
const floatx80 Const_Z = packFloatx80(0, 0x0000, 0);
const floatx80 Const_1 = packFloatx80(0, 0x3fff, BX_CONST64(0x8000000000000000));
const floatx80 Const_L2T = packFloatx80(0, 0x4000, BX_CONST64(0xd49a784bcd1b8afe));
const floatx80 Const_L2E = packFloatx80(0, 0x3fff, BX_CONST64(0xb8aa3b295c17f0bc));
const floatx80 Const_PI = packFloatx80(0, 0x4000, BX_CONST64(0xc90fdaa22168c235));
const floatx80 Const_LG2 = packFloatx80(0, 0x3ffd, BX_CONST64(0x9a209a84fbcff799));
const floatx80 Const_LN2 = packFloatx80(0, 0x3ffe, BX_CONST64(0xb17217f7d1cf79ac));
const floatx80 Const_INF = packFloatx80(0, 0x7fff, BX_CONST64(0x8000000000000000));
/* A fast way to find out whether x is one of RC_DOWN or RC_CHOP
(and not one of RC_RND or RC_UP).
*/
#define DOWN_OR_CHOP() (FPU_CONTROL_WORD & FPU_CW_RC & FPU_RC_DOWN)
BX_CPP_INLINE floatx80 FPU_round_const(const floatx80 &a, int adj)
{
floatx80 result = a;
result.fraction += adj;
return result;
}
#endif
void BX_CPU_C::FLDL2T(bxInstruction_c *i)
{
#if BX_SUPPORT_FPU
BX_CPU_THIS_PTR prepareFPU(i);
clear_C1();
if (! IS_TAG_EMPTY(-1))
{
BX_CPU_THIS_PTR FPU_stack_overflow();
return;
}
BX_CPU_THIS_PTR the_i387.FPU_push();
BX_WRITE_FPU_REGISTER_AND_TAG(FPU_round_const(Const_L2T,
(FPU_CONTROL_WORD == FPU_RC_UP) ? 1 : 0), FPU_Tag_Valid, 0);
#else
BX_INFO(("FLDL2T: required FPU, configure --enable-fpu"));
#endif
}
void BX_CPU_C::FLDL2E(bxInstruction_c *i)
{
#if BX_SUPPORT_FPU
BX_CPU_THIS_PTR prepareFPU(i);
clear_C1();
if (! IS_TAG_EMPTY(-1))
{
BX_CPU_THIS_PTR FPU_stack_overflow();
return;
}
BX_CPU_THIS_PTR the_i387.FPU_push();
BX_WRITE_FPU_REGISTER_AND_TAG(FPU_round_const(Const_L2E,
DOWN_OR_CHOP() ? -1 : 0), FPU_Tag_Valid, 0);
#else
BX_INFO(("FLDL2E: required FPU, configure --enable-fpu"));
#endif
}
void BX_CPU_C::FLDPI(bxInstruction_c *i)
{
#if BX_SUPPORT_FPU
BX_CPU_THIS_PTR prepareFPU(i);
clear_C1();
if (! IS_TAG_EMPTY(-1))
{
BX_CPU_THIS_PTR FPU_stack_overflow();
return;
}
BX_CPU_THIS_PTR the_i387.FPU_push();
BX_WRITE_FPU_REGISTER_AND_TAG(FPU_round_const(Const_PI,
DOWN_OR_CHOP() ? -1 : 0), FPU_Tag_Valid, 0);
#else
BX_INFO(("FLDPI: required FPU, configure --enable-fpu"));
#endif
}
void BX_CPU_C::FLDLG2(bxInstruction_c *i)
{
#if BX_SUPPORT_FPU
BX_CPU_THIS_PTR prepareFPU(i);
clear_C1();
if (! IS_TAG_EMPTY(-1))
{
BX_CPU_THIS_PTR FPU_stack_overflow();
return;
}
BX_CPU_THIS_PTR the_i387.FPU_push();
BX_WRITE_FPU_REGISTER_AND_TAG(FPU_round_const(Const_LG2,
DOWN_OR_CHOP() ? -1 : 0), FPU_Tag_Valid, 0);
#else
BX_INFO(("FLDLG2: required FPU, configure --enable-fpu"));
#endif
}
void BX_CPU_C::FLDLN2(bxInstruction_c *i)
{
#if BX_SUPPORT_FPU
BX_CPU_THIS_PTR prepareFPU(i);
clear_C1();
if (! IS_TAG_EMPTY(-1))
{
BX_CPU_THIS_PTR FPU_stack_overflow();
return;
}
BX_CPU_THIS_PTR the_i387.FPU_push();
BX_WRITE_FPU_REGISTER_AND_TAG(FPU_round_const(Const_LN2,
DOWN_OR_CHOP() ? -1 : 0), FPU_Tag_Valid, 0);
#else
BX_INFO(("FLDLN2: required FPU, configure --enable-fpu"));
#endif
}
void BX_CPU_C::FLD1(bxInstruction_c *i)
{
#if BX_SUPPORT_FPU
BX_CPU_THIS_PTR prepareFPU(i);
clear_C1();
if (! IS_TAG_EMPTY(-1))
{
BX_CPU_THIS_PTR FPU_stack_overflow();
return;
}
BX_CPU_THIS_PTR the_i387.FPU_push();
BX_WRITE_FPU_REGISTER_AND_TAG(Const_1, FPU_Tag_Valid, 0);
#else
BX_INFO(("FLD1: required FPU, configure --enable-fpu"));
#endif
}
void BX_CPU_C::FLDZ(bxInstruction_c *i)
{
#if BX_SUPPORT_FPU
BX_CPU_THIS_PTR prepareFPU(i);
clear_C1();
if (! IS_TAG_EMPTY(-1))
{
BX_CPU_THIS_PTR FPU_stack_overflow();
return;
}
BX_CPU_THIS_PTR the_i387.FPU_push();
BX_WRITE_FPU_REGISTER_AND_TAG(Const_Z, FPU_Tag_Zero, 0);
#else
BX_INFO(("FLDZ: required FPU, configure --enable-fpu"));
#endif
}
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