// Copyright 2020 The Dawn & Tint Authors
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#include "src/tint/lang/spirv/writer/common/operand.h"

namespace tint::spirv::writer {

uint32_t OperandLength(const Operand& o) {
    if (auto* str = std::get_if<std::string>(&o)) {
        // SPIR-V always nul-terminates strings. The length is rounded up to a
        // multiple of 4 bytes with 0 bytes padding the end. Accounting for the
        // nul terminator is why '+ 4u' is used here instead of '+ 3u'.
        return static_cast<uint32_t>((str->length() + 4u) >> 2);
    }
    return 1;
}

}  // namespace tint::spirv::writer