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fp: Add FPInfo

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Provides information about floating-point format for various bit sizes
This commit is contained in:
MerryMage 2018-07-14 09:41:36 +01:00
parent d21659152c
commit 66381352f3
2 changed files with 59 additions and 0 deletions
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1
src/CMakeLists.txt
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@ -17,6 +17,7 @@ add_library(dynarmic
common/crc32.cpp
common/crc32.h
common/fp_util.h
common/fp/info.h
common/fp/rounding_mode.h
common/intrusive_list.h
common/iterator_util.h

58
src/common/fp/info.h Normal file
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@ -0,0 +1,58 @@
/* This file is part of the dynarmic project.
* Copyright (c) 2018 MerryMage
* This software may be used and distributed according to the terms of the GNU
* General Public License version 2 or any later version.
*/
#pragma once
#include "common/common_types.h"
namespace Dynarmic::FP {
template<typename FPT>
struct FPInfo {};
template<>
struct FPInfo<u32> {
static constexpr size_t total_width = 32;
static constexpr size_t exponent_width = 8;
static constexpr size_t explicit_mantissa_width = 23;
static constexpr size_t mantissa_width = explicit_mantissa_width + 1;
static constexpr u32 implicit_leading_bit = u32(1) << explicit_mantissa_width;
static constexpr u32 sign_mask = 0x80000000;
static constexpr u32 exponent_mask = 0x7F800000;
static constexpr u32 mantissa_mask = 0x007FFFFF;
static constexpr int exponent_min = -126;
static constexpr int exponent_max = 127;
static constexpr int exponent_bias = 127;
static constexpr u32 Zero(bool sign) { return sign ? sign_mask : 0; }
static constexpr u32 Infinity(bool sign) { return exponent_mask | Zero(sign); }
static constexpr u32 MaxNormal(bool sign) { return (exponent_mask - 1) | Zero(sign); }
};
template<>
struct FPInfo<u64> {
static constexpr size_t total_width = 64;
static constexpr size_t exponent_width = 11;
static constexpr size_t explicit_mantissa_width = 52;
static constexpr size_t mantissa_width = explicit_mantissa_width + 1;
static constexpr u64 implicit_leading_bit = u64(1) << explicit_mantissa_width;
static constexpr u64 sign_mask = 0x8000'0000'0000'0000;
static constexpr u64 exponent_mask = 0x7FF0'0000'0000'0000;
static constexpr u64 mantissa_mask = 0x000F'FFFF'FFFF'FFFF;
static constexpr int exponent_min = -1022;
static constexpr int exponent_max = 1023;
static constexpr int exponent_bias = 1023;
static constexpr u64 Zero(bool sign) { return sign ? sign_mask : 0; }
static constexpr u64 Infinity(bool sign) { return exponent_mask | Zero(sign); }
static constexpr u64 MaxNormal(bool sign) { return (exponent_mask - 1) | Zero(sign); }
};
} // namespace Dynarmic::FP