yuzu/src/shader_recompiler/frontend/maxwell/translate/impl/vote.cpp

// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <optional>

#include "common/bit_field.h"
#include "common/common_types.h"
#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"

namespace Shader::Maxwell {
namespace {
enum class VoteOp : u64 {
    ALL,
    ANY,
    EQ,
};

[[nodiscard]] IR::U1 VoteOperation(IR::IREmitter& ir, const IR::U1& pred, VoteOp vote_op) {
    switch (vote_op) {
    case VoteOp::ALL:
        return ir.VoteAll(pred);
    case VoteOp::ANY:
        return ir.VoteAny(pred);
    case VoteOp::EQ:
        return ir.VoteEqual(pred);
    default:
        throw NotImplementedException("Invalid VOTE op {}", vote_op);
    }
}

void Vote(TranslatorVisitor& v, u64 insn) {
    union {
        u64 insn;
        BitField<0, 8, IR::Reg> dest_reg;
        BitField<39, 3, IR::Pred> pred_a;
        BitField<42, 1, u64> neg_pred_a;
        BitField<45, 3, IR::Pred> pred_b;
        BitField<48, 2, VoteOp> vote_op;
    } const vote{insn};

    const IR::U1 vote_pred{v.ir.GetPred(vote.pred_a, vote.neg_pred_a != 0)};
    v.ir.SetPred(vote.pred_b, VoteOperation(v.ir, vote_pred, vote.vote_op));
    v.X(vote.dest_reg, v.ir.SubgroupBallot(vote_pred));
}
} // Anonymous namespace

void TranslatorVisitor::VOTE(u64 insn) {
    Vote(*this, insn);
}

} // namespace Shader::Maxwell