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https://github.com/libretro/vemulator-libretro.git
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44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/*
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VeMUlator - A Dreamcast Visual Memory Unit emulator for libretro
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Copyright (C) 2018 Mahmoud Jaoune
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef _BITWISEMATH_H_
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#define _BITWISEMATH_H_
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#include "common.h"
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//These functions perform low-level bitwise operations.
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//Flags [0|0|0|0|0|O|A|C/B]
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///This is an 8-bit adder. Returns sum as first in array, then flags.
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void add8(byte i1, byte i2, byte carry, byte *result);
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void sub8(byte i1, byte i2, byte carry, byte *result);
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///This is an 8-bit subtractor (op1 - op2). Returns difference as first in array, then flags.
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void sub8_old(byte i1, byte i2, byte *result);
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//Take complement
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byte comp8(byte op);
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//Convert to signed
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byte toSigned8(byte op);
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///Converts normal number byteo BCD
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int int2BCD(int dec);
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#endif // _BITWISEMATH_H_
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