src/tint/lang/glsl/writer/raise/binary_polyfill.cc

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#include "src/tint/lang/glsl/writer/raise/binary_polyfill.h"

#include "src/tint/lang/core/fluent_types.h"  // IWYU pragma: export
#include "src/tint/lang/core/ir/builder.h"
#include "src/tint/lang/core/ir/module.h"
#include "src/tint/lang/core/ir/validator.h"
#include "src/tint/lang/core/type/manager.h"
#include "src/tint/lang/glsl/ir/builtin_call.h"

namespace tint::glsl::writer::raise {
namespace {

using namespace tint::core::fluent_types;     // NOLINT
using namespace tint::core::number_suffixes;  // NOLINT

/// PIMPL state for the transform.
struct State {
    /// The IR module.
    core::ir::Module& ir;

    /// The IR builder.
    core::ir::Builder b{ir};

    /// The type manager.
    core::type::Manager& ty{ir.Types()};

    /// Process the module.
    void Process() {
        // Find the binary instructions that need replacing.
        Vector<core::ir::Binary*, 4> binary_worklist;
        for (auto* inst : ir.Instructions()) {
            if (auto* binary = inst->As<core::ir::Binary>()) {
                switch (binary->Op()) {
                    case core::BinaryOp::kAnd:
                    case core::BinaryOp::kOr: {
                        if (binary->LHS()->Type()->IsBoolScalarOrVector()) {
                            binary_worklist.Push(binary);
                        }
                        break;
                    }
                    default:
                        break;
                }
                continue;
            }
        }

        // Replace the binary calls
        for (auto* binary : binary_worklist) {
            switch (binary->Op()) {
                case core::BinaryOp::kAnd:
                case core::BinaryOp::kOr:
                    BitwiseBoolean(binary);
                    break;
                default:
                    TINT_UNIMPLEMENTED();
            }
        }
    }

    void BitwiseBoolean(core::ir::Binary* binary) {
        b.InsertBefore(binary, [&] {
            auto* res_ty = ty.MatchWidth(ty.u32(), binary->Result(0)->Type());
            auto* lhs = b.Convert(res_ty, binary->LHS());
            auto* rhs = b.Convert(res_ty, binary->RHS());

            core::ir::Value* result = nullptr;
            switch (binary->Op()) {
                case core::BinaryOp::kAnd:
                    result = b.And(res_ty, lhs, rhs)->Result(0);
                    break;
                case core::BinaryOp::kOr:
                    result = b.Or(res_ty, lhs, rhs)->Result(0);
                    break;
                default:
                    TINT_UNREACHABLE();
            }
            b.ConvertWithResult(binary->DetachResult(), result);
        });
        binary->Destroy();
    }
};

}  // namespace

Result<SuccessType> BinaryPolyfill(core::ir::Module& ir) {
    auto result = ValidateAndDumpIfNeeded(ir, "glsl.BinaryPolyfill transform");
    if (result != Success) {
        return result.Failure();
    }

    State{ir}.Process();

    return Success;
}

}  // namespace tint::glsl::writer::raise