mirror of
https://github.com/azahar-emu/dynarmic
synced 2025-11-10 17:10:00 +01:00
65 lines
2.9 KiB
C++
65 lines
2.9 KiB
C++
/* This file is part of the dynarmic project.
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* Copyright (c) 2018 MerryMage
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* This software may be used and distributed according to the terms of the GNU
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* General Public License version 2 or any later version.
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*/
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#pragma once
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#include "common/common_types.h"
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namespace Dynarmic::FP {
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template<typename FPT>
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struct FPInfo {};
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template<>
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struct FPInfo<u32> {
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static constexpr size_t total_width = 32;
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static constexpr size_t exponent_width = 8;
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static constexpr size_t explicit_mantissa_width = 23;
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static constexpr size_t mantissa_width = explicit_mantissa_width + 1;
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static constexpr u32 implicit_leading_bit = u32(1) << explicit_mantissa_width;
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static constexpr u32 sign_mask = 0x80000000;
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static constexpr u32 exponent_mask = 0x7F800000;
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static constexpr u32 mantissa_mask = 0x007FFFFF;
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static constexpr int exponent_min = -126;
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static constexpr int exponent_max = 127;
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static constexpr int exponent_bias = 127;
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static constexpr u32 Zero(bool sign) { return sign ? sign_mask : 0; }
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static constexpr u32 Infinity(bool sign) { return exponent_mask | Zero(sign); }
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static constexpr u32 MaxNormal(bool sign) { return (exponent_mask - 1) | Zero(sign); }
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static constexpr u32 DefaultNaN() { return exponent_mask | (u32(1) << (explicit_mantissa_width - 1)); }
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static constexpr u32 OnePointFive(bool sign) { return Zero(sign) | (u32(1) << (explicit_mantissa_width - 1)) | (u32(exponent_bias) << explicit_mantissa_width); }
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static constexpr u32 Two(bool sign) { return Zero(sign) | (u32(exponent_bias + 1) << explicit_mantissa_width); }
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};
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template<>
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struct FPInfo<u64> {
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static constexpr size_t total_width = 64;
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static constexpr size_t exponent_width = 11;
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static constexpr size_t explicit_mantissa_width = 52;
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static constexpr size_t mantissa_width = explicit_mantissa_width + 1;
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static constexpr u64 implicit_leading_bit = u64(1) << explicit_mantissa_width;
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static constexpr u64 sign_mask = 0x8000'0000'0000'0000;
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static constexpr u64 exponent_mask = 0x7FF0'0000'0000'0000;
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static constexpr u64 mantissa_mask = 0x000F'FFFF'FFFF'FFFF;
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static constexpr int exponent_min = -1022;
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static constexpr int exponent_max = 1023;
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static constexpr int exponent_bias = 1023;
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static constexpr u64 Zero(bool sign) { return sign ? sign_mask : 0; }
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static constexpr u64 Infinity(bool sign) { return exponent_mask | Zero(sign); }
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static constexpr u64 MaxNormal(bool sign) { return (exponent_mask - 1) | Zero(sign); }
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static constexpr u64 DefaultNaN() { return exponent_mask | (u64(1) << (explicit_mantissa_width - 1)); }
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static constexpr u64 OnePointFive(bool sign) { return Zero(sign) | (u64(1) << (explicit_mantissa_width - 1)) | (u64(exponent_bias) << explicit_mantissa_width); }
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static constexpr u64 Two(bool sign) { return Zero(sign) | (u64(exponent_bias + 1) << explicit_mantissa_width); }
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};
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} // namespace Dynarmic::FP
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