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A32: Implement ASIMD VMLA/VMLS (scalar)

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While we're at it, we can join the implementation of VMUL into a common
function.
This commit is contained in:
Lioncash 2020-06-20 20:30:03 -04:00 committed by merry
parent 70d071e6ab
commit 230fa02648
3 changed files with 47 additions and 12 deletions
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2
src/frontend/A32/decoder/asimd.inc
View file

@ -52,7 +52,7 @@ INST(asimd_VRSQRTS, "VRSQRTS", "111100100D1znnnndddd111
// Two registers and a scalar
INST(arm_UDF, "UNALLOCATED", "1111001-1-11-------------1-0----") // ASIMD
//INST(asimd_VMLA_scalar, "VMLA (scalar)", "1111001U1-BB--------0x0x-1-0----") // ASIMD
INST(asimd_VMLA_scalar, "VMLA (scalar)", "1111001Q1Dzznnnndddd0o0FN1M0mmmm") // ASIMD
//INST(asimd_VMLAL_scalar, "VMLAL (scalar)", "1111001U1-BB--------0x10-1-0----") // ASIMD
//INST(asimd_VQDMLAL, "VQDMLAL/VQDMLSL", "111100101-BB--------0x11-1-0----") // ASIMD
INST(asimd_VMUL_scalar, "VMUL (scalar)", "1111001Q1Dzznnnndddd100FN1M0mmmm") // ASIMD

56
src/frontend/A32/translate/impl/asimd_two_regs_scalar.cpp
View file

@ -9,30 +9,64 @@
#include "frontend/A32/translate/impl/translate_arm.h"
namespace Dynarmic::A32 {
namespace {
enum class MultiplyBehavior {
Multiply,
MultiplyAccumulate,
MultiplySubtract,
};
bool ArmTranslatorVisitor::asimd_VMUL_scalar(bool Q, bool D, size_t sz, size_t Vn, size_t Vd, bool F, bool N, bool M, size_t Vm) {
bool ScalarMultiply(ArmTranslatorVisitor& v, bool Q, bool D, size_t sz, size_t Vn, size_t Vd, bool F, bool N, bool M, size_t Vm,
MultiplyBehavior multiply) {
ASSERT_MSG(sz != 0b11, "Decode error");
if (sz == 0b00 || (F && sz == 0b01)) {
return UndefinedInstruction();
}
if (Q && (Common::Bit<0>(Vd) || Common::Bit<0>(Vn))) {
return UndefinedInstruction();
return v.UndefinedInstruction();
}
if (Q && (Common::Bit<0>(Vd) || Common::Bit<0>(Vn))) {
return v.UndefinedInstruction();
}
const size_t esize = 8U << sz;
const auto d = ToVector(Q, Vd, D);
const auto n = ToVector(Q, Vn, N);
const size_t esize = 8u << sz;
const auto m = ExtReg::Q0 + ((Vm >> 1) & (esize == 16 ? 0b11 : 0b111));
const auto index = concatenate(Imm<1>{Common::Bit<0>(Vm)}, Imm<1>{M}, Imm<1>{Common::Bit<3>(Vm)}).ZeroExtend() >> (esize == 16 ? 0 : 1);
const auto scalar = ir.VectorGetElement(esize, ir.GetVector(m), index);
const auto scalar = v.ir.VectorGetElement(esize, v.ir.GetVector(m), index);
const auto reg_n = ir.GetVector(n);
const auto reg_m = ir.VectorBroadcast(esize, scalar);
const auto result = F ? ir.FPVectorMul(esize, reg_n, reg_m, false) : ir.VectorMultiply(esize, reg_n, reg_m);
const auto reg_n = v.ir.GetVector(n);
const auto reg_m = v.ir.VectorBroadcast(esize, scalar);
const auto addend = F ? v.ir.FPVectorMul(esize, reg_n, reg_m, false)
: v.ir.VectorMultiply(esize, reg_n, reg_m);
const auto result = [&] {
switch (multiply) {
case MultiplyBehavior::Multiply:
return addend;
case MultiplyBehavior::MultiplyAccumulate:
return F ? v.ir.FPVectorAdd(esize, v.ir.GetVector(d), addend, false)
: v.ir.VectorAdd(esize, v.ir.GetVector(d), addend);
case MultiplyBehavior::MultiplySubtract:
return F ? v.ir.FPVectorSub(esize, v.ir.GetVector(d), addend, false)
: v.ir.VectorSub(esize, v.ir.GetVector(d), addend);
default:
return IR::U128{};
}
}();
ir.SetVector(d, result);
v.ir.SetVector(d, result);
return true;
}
} // Anonymous namespace
bool ArmTranslatorVisitor::asimd_VMLA_scalar(bool Q, bool D, size_t sz, size_t Vn, size_t Vd, bool op, bool F, bool N, bool M, size_t Vm) {
const auto behavior = op ? MultiplyBehavior::MultiplySubtract
: MultiplyBehavior::MultiplyAccumulate;
return ScalarMultiply(*this, Q, D, sz, Vn, Vd, F, N, M, Vm, behavior);
}
bool ArmTranslatorVisitor::asimd_VMUL_scalar(bool Q, bool D, size_t sz, size_t Vn, size_t Vd, bool F, bool N, bool M, size_t Vm) {
return ScalarMultiply(*this, Q, D, sz, Vn, Vd, F, N, M, Vm, MultiplyBehavior::Multiply);
}
} // namespace Dynarmic::A32

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

@ -492,6 +492,7 @@ struct ArmTranslatorVisitor final {
bool asimd_VRSQRTS(bool D, bool sz, size_t Vn, size_t Vd, bool N, bool Q, bool M, size_t Vm);
// Advanced SIMD two registers and a scalar
bool asimd_VMLA_scalar(bool Q, bool D, size_t sz, size_t Vn, size_t Vd, bool op, bool F, bool N, bool M, size_t Vm);
bool asimd_VMUL_scalar(bool Q, bool D, size_t sz, size_t Vn, size_t Vd, bool F, bool N, bool M, size_t Vm);
// Two registers and a shift amount