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common/fp/info: Add specialization of FPInfo for half-precision floating point

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Puts the necessary info struct in place for further use.
This commit is contained in:
Lioncash 2019-03-08 03:29:52 -05:00 committed by MerryMage
parent bbd5330ad2
commit 0b67b94b6c
1 changed files with 23 additions and 0 deletions
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23
src/common/fp/info.h
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@ -14,6 +14,29 @@ namespace Dynarmic::FP {
template<typename FPT> template<typename FPT>
struct FPInfo {}; struct FPInfo {};
template<>
struct FPInfo<u16> {
static constexpr size_t total_width = 16;
static constexpr size_t exponent_width = 5;
static constexpr size_t explicit_mantissa_width = 10;
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 = 0x8000;
static constexpr u32 exponent_mask = 0x7C00;
static constexpr u32 mantissa_mask = 0x3FF;
static constexpr u32 mantissa_msb = 0x200;
static constexpr int exponent_min = -14;
static constexpr int exponent_max = 15;
static constexpr int exponent_bias = 15;
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); }
static constexpr u32 DefaultNaN() { return exponent_mask | (u32(1) << (explicit_mantissa_width - 1)); }
};
template<> template<>
struct FPInfo<u32> { struct FPInfo<u32> {
static constexpr size_t total_width = 32; static constexpr size_t total_width = 32;