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backend/x64: Add vrange constants

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Adds compile-time `FpRangeLUT` for generating the 8-bit
immediate LUT value for the `vrange*` instruction
This commit is contained in:
Wunkolo 2021-05-28 22:10:07 -07:00 committed by merry
parent c1d5a7977e
commit c82e29ed82
1 changed files with 23 additions and 0 deletions
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23
src/dynarmic/backend/x64/constants.h
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@ -87,6 +87,29 @@ constexpr u32 FixupLUT(FpFixup src_qnan = FpFixup::A,
return fixup_lut;
}
// Opcodes for use with vrange* instructions
enum class FpRangeSelect : u8 {
Min = 0b00,
Max = 0b01,
AbsMin = 0b10, // Smaller absolute value
AbsMax = 0b11, // Larger absolute value
};
enum class FpRangeSign : u8 {
A = 0b00, // Copy sign of operand A
Preserve = 0b01, // Leave sign as is
Positive = 0b10, // Set Positive
Negative = 0b11, // Set Negative
};
// Generates 8-bit immediate LUT for vrange instruction
constexpr u8 FpRangeLUT(FpRangeSelect range_select, FpRangeSign range_sign) {
u8 range_lut = 0;
range_lut = Common::ModifyBits<0, 1, u8>(range_lut, static_cast<u8>(range_select));
range_lut = Common::ModifyBits<2, 3, u8>(range_lut, static_cast<u8>(range_sign));
return range_lut;
}
constexpr std::optional<int> ConvertRoundingModeToX64Immediate(FP::RoundingMode rounding_mode) {
switch (rounding_mode) {
case FP::RoundingMode::ToNearest_TieEven: