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AK: Add fast paths for aligned bit writes in BitOutputStream
If the bit write is aligned (or has been aligned during the write) we can write in multiples of 32/16/8 bits for increased performance.
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@ -152,6 +152,12 @@ public:
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void write_bits(u32 bits, size_t count)
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{
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VERIFY(count <= 32);
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if (count == 32 && !m_next_byte.has_value()) { // fast path for aligned 32 bit writes
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m_stream << bits;
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return;
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}
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size_t n_written = 0;
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while (n_written < count) {
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if (m_stream.has_any_error()) {
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@ -167,6 +173,12 @@ public:
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m_stream << m_next_byte.value();
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m_next_byte.clear();
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}
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} else if (count - n_written >= 16) { // fast path for aligned 16 bit writes
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m_stream << (u16)((bits >> n_written) & 0xFFFF);
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n_written += 16;
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} else if (count - n_written >= 8) { // fast path for aligned 8 bit writes
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m_stream << (u8)((bits >> n_written) & 0xFF);
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n_written += 8;
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} else {
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m_bit_offset = 0;
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m_next_byte = 0;
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