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A32: Implement ASIMD VCVT (between floating-point and fixed-point)

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This commit is contained in:
MerryMage 2020-06-21 20:22:39 +01:00
parent 6f56043a73
commit 562a98bcf9
3 changed files with 25 additions and 1 deletions
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2
src/frontend/A32/decoder/asimd.inc
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@ -94,7 +94,7 @@ INST(asimd_VQRSHRUN, "VQRSHRUN", "111100111Diiiiiidddd100
//INST(asimd_VQSHRN, "VQSHRN", "1111001U1-vvv-------100100-1----") // ASIMD
INST(asimd_VQRSHRN, "VQRSHRN", "1111001U1Diiiiiidddd100101M1mmmm") // ASIMD
//INST(asimd_SHLL, "SHLL", "1111001U1-vvv-------101000-1----") // ASIMD
//INST(asimd_VCVT_fixed, "VCVT (fixed-point)", "1111001U1-vvv-------111x0B-1----") // ASIMD
INST(asimd_VCVT_fixed, "VCVT (fixed-point)", "1111001U1Diiiiiidddd111o0QM1mmmm") // ASIMD
// Two registers, miscellaneous
INST(asimd_VREV, "VREV{16,32,64}", "111100111D11zz00dddd000ooQM0mmmm") // ASIMD

23
src/frontend/A32/translate/impl/asimd_two_regs_shift.cpp
View file

@ -291,4 +291,27 @@ bool ArmTranslatorVisitor::asimd_VQRSHRN(bool U, bool D, size_t imm6, size_t Vd,
Rounding::Round, U ? Narrowing::SaturateToUnsigned : Narrowing::SaturateToSigned, U ? Signedness::Unsigned : Signedness::Signed);
}
bool ArmTranslatorVisitor::asimd_VCVT_fixed(bool U, bool D, size_t imm6, size_t Vd, bool to_fixed, bool Q, bool M, size_t Vm) {
if (Q && (Common::Bit<0>(Vd) || Common::Bit<0>(Vm))) {
return UndefinedInstruction();
}
ASSERT_MSG((Common::Bits<3, 5>(imm6) != 0), "Decode error");
if (!Common::Bit<5>(imm6)) {
return UndefinedInstruction();
}
const size_t fbits = 64 - 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 = to_fixed ? (U ? ir.FPVectorToUnsignedFixed(32, reg_m, fbits, FP::RoundingMode::TowardsZero, false) : ir.FPVectorToSignedFixed(32, reg_m, fbits, FP::RoundingMode::TowardsZero, false))
: (U ? ir.FPVectorFromUnsignedFixed(32, reg_m, fbits, FP::RoundingMode::ToNearest_TieEven, false) : ir.FPVectorFromSignedFixed(32, reg_m, fbits, FP::RoundingMode::ToNearest_TieEven, false));
ir.SetVector(d, result);
return true;
}
} // namespace Dynarmic::A32

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

@ -517,6 +517,7 @@ struct ArmTranslatorVisitor final {
bool asimd_VSHRN(bool D, size_t imm6, size_t Vd, bool M, size_t Vm);
bool asimd_VQRSHRUN(bool D, size_t imm6, size_t Vd, bool M, size_t Vm);
bool asimd_VQRSHRN(bool U, bool D, size_t imm6, size_t Vd, bool M, size_t Vm);
bool asimd_VCVT_fixed(bool U, bool D, size_t imm6, size_t Vd, bool to_fixed, 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);