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backend/x64: Add vfixup constants

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Adds compile-time `FixupLUT` function for generating the 32-bit
LUT of src->dst mappings
This commit is contained in:
Wunkolo 2021-05-28 14:24:10 -07:00 committed by merry
parent 0a77ee1a58
commit fe5abdb3e1
1 changed files with 43 additions and 0 deletions
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43
src/dynarmic/backend/x64/constants.h
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@ -5,6 +5,7 @@
#pragma once
#include "dynarmic/common/bit_util.h"
#include "dynarmic/common/common_types.h"
namespace Dynarmic::Backend::X64 {
@ -42,4 +43,46 @@ constexpr u8 b = 0b11001100;
constexpr u8 c = 0b10101010;
} // namespace Tern
// Opcodes for use with vfixupimm
enum class FpFixup : u8 {
A = 0b0000, // A
B = 0b0001, // B
QNaN_B = 0b0010, // QNaN with sign of B
IndefNaN = 0b0011, // Indefinite QNaN (Negative QNaN with no payload on x86)
NegInf = 0b0100, // -Infinity
PosInf = 0b0101, // +Infinity
Inf_B = 0b0110, // Infinity with sign of B
NegZero = 0b0111, // -0.0
PosZero = 0b1000, // +0.0
NegOne = 0b1001, // -1.0
PosOne = 0b1010, // +1.0
Half = 0b1011, // 0.5
Ninety = 0b1100, // 90.0
HalfPi = 0b1101, // PI/2
PosMax = 0b1110, // +{FLT_MAX,DBL_MAX}
NegMax = 0b1111, // -{FLT_MAX,DBL_MAX}
};
// Generates 32-bit LUT for vfixupimm instruction
constexpr u32 FixupLUT(
FpFixup src_qnan = FpFixup::A,
FpFixup src_snan = FpFixup::A,
FpFixup src_zero = FpFixup::A,
FpFixup src_posone = FpFixup::A,
FpFixup src_neginf = FpFixup::A,
FpFixup src_posinf = FpFixup::A,
FpFixup src_pos = FpFixup::A,
FpFixup src_neg = FpFixup::A) {
u32 fixup_lut = 0;
fixup_lut = Common::ModifyBits<0, 3, u32>(fixup_lut, static_cast<u32>(src_qnan));
fixup_lut = Common::ModifyBits<4, 7, u32>(fixup_lut, static_cast<u32>(src_snan));
fixup_lut = Common::ModifyBits<8, 11, u32>(fixup_lut, static_cast<u32>(src_zero));
fixup_lut = Common::ModifyBits<12, 15, u32>(fixup_lut, static_cast<u32>(src_posone));
fixup_lut = Common::ModifyBits<16, 19, u32>(fixup_lut, static_cast<u32>(src_neginf));
fixup_lut = Common::ModifyBits<20, 23, u32>(fixup_lut, static_cast<u32>(src_posinf));
fixup_lut = Common::ModifyBits<24, 27, u32>(fixup_lut, static_cast<u32>(src_pos));
fixup_lut = Common::ModifyBits<28, 31, u32>(fixup_lut, static_cast<u32>(src_neg));
return fixup_lut;
}
} // namespace Dynarmic::Backend::X64