189 lines
4.9 KiB
C++
189 lines
4.9 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2003-2009 Stanislav Shwartsman
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// Written by Stanislav Shwartsman [sshwarts at sourceforge net]
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; 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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#define NEED_CPU_REG_SHORTCUTS 1
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#include "bochs.h"
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#include "cpu/cpu.h"
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#define LOG_THIS BX_CPU_THIS_PTR
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#if BX_SUPPORT_FPU
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#include "softfloatx80.h"
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const floatx80 Const_QNaN = packFloatx80(0, floatx80_default_nan_exp, floatx80_default_nan_fraction);
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const floatx80 Const_Z = packFloatx80(0, 0x0000, 0);
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const floatx80 Const_1 = packFloatx80(0, 0x3fff, BX_CONST64(0x8000000000000000));
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const floatx80 Const_L2T = packFloatx80(0, 0x4000, BX_CONST64(0xd49a784bcd1b8afe));
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const floatx80 Const_L2E = packFloatx80(0, 0x3fff, BX_CONST64(0xb8aa3b295c17f0bc));
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const floatx80 Const_PI = packFloatx80(0, 0x4000, BX_CONST64(0xc90fdaa22168c235));
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const floatx80 Const_LG2 = packFloatx80(0, 0x3ffd, BX_CONST64(0x9a209a84fbcff799));
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const floatx80 Const_LN2 = packFloatx80(0, 0x3ffe, BX_CONST64(0xb17217f7d1cf79ac));
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const floatx80 Const_INF = packFloatx80(0, 0x7fff, BX_CONST64(0x8000000000000000));
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/* A fast way to find out whether x is one of RC_DOWN or RC_CHOP
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(and not one of RC_RND or RC_UP).
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*/
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#define DOWN_OR_CHOP() (FPU_CONTROL_WORD & FPU_CW_RC & FPU_RC_DOWN)
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BX_CPP_INLINE floatx80 FPU_round_const(const floatx80 &a, int adj)
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{
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floatx80 result = a;
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result.fraction += adj;
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return result;
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::FLDL2T(bxInstruction_c *i)
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{
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BX_CPU_THIS_PTR prepareFPU(i);
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BX_CPU_THIS_PTR FPU_update_last_instruction(i);
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clear_C1();
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if (! IS_TAG_EMPTY(-1))
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{
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FPU_stack_overflow(i);
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}
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else {
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BX_CPU_THIS_PTR the_i387.FPU_push();
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BX_WRITE_FPU_REG(FPU_round_const(Const_L2T, (FPU_CONTROL_WORD & FPU_CW_RC) == FPU_RC_UP), 0);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::FLDL2E(bxInstruction_c *i)
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{
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BX_CPU_THIS_PTR prepareFPU(i);
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BX_CPU_THIS_PTR FPU_update_last_instruction(i);
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clear_C1();
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if (! IS_TAG_EMPTY(-1))
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{
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FPU_stack_overflow(i);
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}
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else {
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BX_CPU_THIS_PTR the_i387.FPU_push();
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BX_WRITE_FPU_REG(FPU_round_const(Const_L2E, DOWN_OR_CHOP() ? -1 : 0), 0);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::FLDPI(bxInstruction_c *i)
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{
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BX_CPU_THIS_PTR prepareFPU(i);
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BX_CPU_THIS_PTR FPU_update_last_instruction(i);
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clear_C1();
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if (! IS_TAG_EMPTY(-1))
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{
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FPU_stack_overflow(i);
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}
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else {
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BX_CPU_THIS_PTR the_i387.FPU_push();
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BX_WRITE_FPU_REG(FPU_round_const(Const_PI, DOWN_OR_CHOP() ? -1 : 0), 0);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::FLDLG2(bxInstruction_c *i)
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{
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BX_CPU_THIS_PTR prepareFPU(i);
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BX_CPU_THIS_PTR FPU_update_last_instruction(i);
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clear_C1();
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if (! IS_TAG_EMPTY(-1))
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{
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FPU_stack_overflow(i);
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}
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else {
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BX_CPU_THIS_PTR the_i387.FPU_push();
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BX_WRITE_FPU_REG(FPU_round_const(Const_LG2, DOWN_OR_CHOP() ? -1 : 0), 0);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::FLDLN2(bxInstruction_c *i)
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{
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BX_CPU_THIS_PTR prepareFPU(i);
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BX_CPU_THIS_PTR FPU_update_last_instruction(i);
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clear_C1();
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if (! IS_TAG_EMPTY(-1))
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{
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FPU_stack_overflow(i);
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}
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else {
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BX_CPU_THIS_PTR the_i387.FPU_push();
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BX_WRITE_FPU_REG(FPU_round_const(Const_LN2, DOWN_OR_CHOP() ? -1 : 0), 0);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::FLD1(bxInstruction_c *i)
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{
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BX_CPU_THIS_PTR prepareFPU(i);
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BX_CPU_THIS_PTR FPU_update_last_instruction(i);
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clear_C1();
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if (! IS_TAG_EMPTY(-1))
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{
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FPU_stack_overflow(i);
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}
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else {
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BX_CPU_THIS_PTR the_i387.FPU_push();
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BX_WRITE_FPU_REG(Const_1, 0);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::FLDZ(bxInstruction_c *i)
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{
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BX_CPU_THIS_PTR prepareFPU(i);
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BX_CPU_THIS_PTR FPU_update_last_instruction(i);
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clear_C1();
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if (! IS_TAG_EMPTY(-1))
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{
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FPU_stack_overflow(i);
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}
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else {
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BX_CPU_THIS_PTR the_i387.FPU_push();
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BX_WRITE_FPU_REG(Const_Z, 0);
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}
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BX_NEXT_INSTR(i);
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}
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#endif
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