78 lines
1.9 KiB
C++
78 lines
1.9 KiB
C++
/******************************************************************************/
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/* Mednafen - Multi-system Emulator */
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/******************************************************************************/
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/* v810_fp_ops.h:
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** Copyright (C) 2014-2016 Mednafen Team
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** as published by the Free Software Foundation; either version 2
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** of the License, or (at your option) any later version.
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**
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** This program 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
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software Foundation, Inc.,
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** 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "../defs.h"
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class V810_FP_Ops
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{
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public:
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uint32 mul(uint32 a, uint32 b);
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uint32 div(uint32 a, uint32 b);
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uint32 add(uint32 a, uint32 b);
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uint32 sub(uint32 a, uint32 b);
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int cmp(uint32 a, uint32 b);
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uint32 itof(uint32 v);
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uint32 ftoi(uint32 v, bool truncate);
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enum
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{
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flag_invalid = 0x0001,
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flag_divbyzero = 0x0002,
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flag_overflow = 0x0004,
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flag_underflow = 0x0008,
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flag_inexact = 0x0010,
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flag_reserved = 0x0020
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};
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inline uint32 get_flags(void)
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{
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return exception_flags;
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}
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inline void clear_flags(void)
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{
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exception_flags = 0;
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}
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private:
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unsigned exception_flags;
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struct fpim
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{
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uint64 f;
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int exp;
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bool sign;
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};
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bool fp_is_zero(uint32 v);
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bool fp_is_inf_nan_sub(uint32 v);
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unsigned clz64(uint64 v);
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void fpim_decode(fpim* df, uint32 v);
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void fpim_round(fpim* df);
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void fpim_round_int(fpim* df, bool truncate = false);
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uint32 fpim_encode(fpim* df);
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};
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