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A32: Implement ASIMD VSRA

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This commit is contained in:
Lioncash 2020-06-18 10:53:19 -04:00
parent 6c142bc5cc
commit 276e0b71dc
3 changed files with 33 additions and 20 deletions
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2
src/frontend/A32/decoder/asimd.inc
View file

@ -59,7 +59,7 @@ INST(asimd_VQSUB, "VQSUB", "1111001U0Dzznnnndddd001
// Two registers and a shift amount
INST(asimd_SHR, "SHR", "1111001U1Diiiiiidddd0000LQM1mmmm") // ASIMD
//INST(asimd_SRA, "SRA", "1111001U1-vvv-------0001LB-1----") // ASIMD
INST(asimd_SRA, "SRA", "1111001U1Diiiiiidddd0001LQM1mmmm") // ASIMD
//INST(asimd_VRSHR, "VRSHR", "1111001U1-vvv-------0010LB-1----") // ASIMD
//INST(asimd_VRSRA, "VRSRA", "1111001U1-vvv-------0011LB-1----") // ASIMD
//INST(asimd_VSRI, "VSRI", "111100111-vvv-------0100LB-1----") // ASIMD

50
src/frontend/A32/translate/impl/asimd_two_regs_shift.cpp
View file

@ -9,44 +9,56 @@
namespace Dynarmic::A32 {
namespace {
enum class Accumulating {
None,
Accumulate
};
std::pair<size_t, size_t> ElementSizeAndShiftAmount(bool L, size_t imm6) {
if (L) {
return {64, 64U - imm6};
return {64, 64 - imm6};
}
const int highest = Common::HighestSetBit(imm6 >> 3);
if (highest == 0) {
return {8, 16 - imm6};
const size_t esize = 8U << Common::HighestSetBit(imm6 >> 3);
const size_t shift_amount = (esize * 2) - imm6;
return {esize, shift_amount};
}
if (highest == 1) {
return {16, 32U - imm6};
}
return {32, 64U - imm6};
}
} // Anonymous namespace
bool ArmTranslatorVisitor::asimd_SHR(bool U, bool D, size_t imm6, size_t Vd, bool L, bool Q, bool M, size_t Vm) {
bool ShiftRight(ArmTranslatorVisitor& v, bool U, bool D, size_t imm6, size_t Vd, bool L, bool Q, bool M, size_t Vm,
Accumulating accumulate) {
if (Q && (Common::Bit<0>(Vd) || Common::Bit<0>(Vm))) {
return UndefinedInstruction();
return v.UndefinedInstruction();
}
// Technically just a related encoding (One register and modified immediate instructions)
if (!L && Common::Bits<3, 5>(imm6) == 0) {
return UndefinedInstruction();
return v.UndefinedInstruction();
}
const auto [esize, shift_amount] = ElementSizeAndShiftAmount(L, imm6);
const auto d = ToVector(Q, Vd, D);
const auto m = ToVector(Q, Vm, M);
const auto reg_m = ir.GetVector(m);
const auto result = U ? ir.VectorLogicalShiftRight(esize, reg_m, static_cast<u8>(shift_amount))
: ir.VectorArithmeticShiftRight(esize, reg_m, static_cast<u8>(shift_amount));
const auto reg_m = v.ir.GetVector(m);
auto result = U ? v.ir.VectorLogicalShiftRight(esize, reg_m, static_cast<u8>(shift_amount))
: v.ir.VectorArithmeticShiftRight(esize, reg_m, static_cast<u8>(shift_amount));
ir.SetVector(d, result);
if (accumulate == Accumulating::Accumulate) {
const auto reg_d = v.ir.GetVector(d);
result = v.ir.VectorAdd(esize, result, reg_d);
}
v.ir.SetVector(d, result);
return true;
}
} // Anonymous namespace
bool ArmTranslatorVisitor::asimd_SHR(bool U, bool D, size_t imm6, size_t Vd, bool L, bool Q, bool M, size_t Vm) {
return ShiftRight(*this, U, D, imm6, Vd, L, Q, M, Vm, Accumulating::None);
}
bool ArmTranslatorVisitor::asimd_SRA(bool U, bool D, size_t imm6, size_t Vd, bool L, bool Q, bool M, size_t Vm) {
return ShiftRight(*this, U, D, imm6, Vd, L, Q, M, Vm, Accumulating::Accumulate);
}
} // namespace Dynarmic::A32

1
src/frontend/A32/translate/impl/translate_arm.h
View file

@ -453,6 +453,7 @@ struct ArmTranslatorVisitor final {
// Two registers and a shift amount
bool asimd_SHR(bool U, bool D, size_t imm6, size_t Vd, bool L, bool Q, bool M, size_t Vm);
bool asimd_SRA(bool U, bool D, size_t imm6, size_t Vd, bool L, bool Q, bool M, size_t Vm);
// Advanced SIMD two register, miscellaneous
bool asimd_VREV(bool D, size_t sz, size_t Vd, size_t op, bool Q, bool M, size_t Vm);