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frontend/ir_emitter: Add opcodes for signed saturated left shifts with unsigned saturation

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This commit is contained in:
Lioncash
2019-04-12 15:47:35 -04:00
committed by MerryMage
parent b91c6c8bae
commit a4cadf1cd9
5 changed files with 78 additions and 0 deletions
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54
src/backend/x64/emit_x64_vector.cpp
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@@ -3871,6 +3871,60 @@ void EmitX64::EmitVectorSignedSaturatedShiftLeft64(EmitContext& ctx, IR::Inst* i
EmitTwoArgumentFallbackWithSaturation(code, ctx, inst, VectorSignedSaturatedShiftLeft<s64>);
}
template <typename T, typename U = std::make_unsigned_t<T>>
static bool VectorSignedSaturatedShiftLeftUnsigned(VectorArray<T>& dst, const VectorArray<T>& data, const VectorArray<T>& shift_values) {
static_assert(std::is_signed_v<T>, "T must be signed.");
constexpr size_t bit_size_minus_one = Common::BitSize<T>() - 1;
bool qc_flag = false;
for (size_t i = 0; i < dst.size(); i++) {
const T element = data[i];
const T shift = std::clamp<T>(static_cast<T>(Common::SignExtend<8>(shift_values[i] & 0xFF)),
-static_cast<T>(bit_size_minus_one), std::numeric_limits<T>::max());
if (element == 0) {
dst[i] = 0;
} else if (element < 0) {
dst[i] = 0;
qc_flag = true;
} else if (shift < 0) {
dst[i] = static_cast<T>(element >> -shift);
} else if (static_cast<U>(shift) > bit_size_minus_one) {
dst[i] = static_cast<T>(std::numeric_limits<U>::max());
qc_flag = true;
} else {
const U shifted = static_cast<U>(element) << static_cast<U>(shift);
const U shifted_test = shifted >> static_cast<U>(shift);
if (shifted_test != static_cast<U>(element)) {
dst[i] = static_cast<T>(std::numeric_limits<U>::max());
qc_flag = true;
} else {
dst[i] = shifted;
}
}
}
return qc_flag;
}
void EmitX64::EmitVectorSignedSaturatedShiftLeftUnsigned8(EmitContext& ctx, IR::Inst* inst) {
EmitTwoArgumentFallbackWithSaturation(code, ctx, inst, VectorSignedSaturatedShiftLeftUnsigned<s8>);
}
void EmitX64::EmitVectorSignedSaturatedShiftLeftUnsigned16(EmitContext& ctx, IR::Inst* inst) {
EmitTwoArgumentFallbackWithSaturation(code, ctx, inst, VectorSignedSaturatedShiftLeftUnsigned<s16>);
}
void EmitX64::EmitVectorSignedSaturatedShiftLeftUnsigned32(EmitContext& ctx, IR::Inst* inst) {
EmitTwoArgumentFallbackWithSaturation(code, ctx, inst, VectorSignedSaturatedShiftLeftUnsigned<s32>);
}
void EmitX64::EmitVectorSignedSaturatedShiftLeftUnsigned64(EmitContext& ctx, IR::Inst* inst) {
EmitTwoArgumentFallbackWithSaturation(code, ctx, inst, VectorSignedSaturatedShiftLeftUnsigned<s64>);
}
void EmitX64::EmitVectorSub8(EmitContext& ctx, IR::Inst* inst) {
EmitVectorOperation(code, ctx, inst, &Xbyak::CodeGenerator::psubb);
}