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Speedup Java decoder. (#547)
* geo corpus decodes ~5% faster * fetchlogs corpus decodes ~25% faster
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@ -759,18 +759,29 @@ final class Decode {
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state.runningState = COPY_LOOP;
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// fall through
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case COPY_LOOP:
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for (; state.j < state.copyLength;) {
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ringBuffer[state.pos] =
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ringBuffer[(state.pos - state.distance) & ringBufferMask];
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// TODO: condense
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state.metaBlockLength--;
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state.j++;
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if (state.pos++ == ringBufferMask) {
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state.nextRunningState = COPY_LOOP;
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state.bytesToWrite = state.ringBufferSize;
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state.bytesWritten = 0;
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state.runningState = WRITE;
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break;
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int src = (state.pos - state.distance) & ringBufferMask;
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int dst = state.pos;
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int copyLength = state.copyLength - state.j;
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if ((src + copyLength < ringBufferMask) && (dst + copyLength < ringBufferMask)) {
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for (int k = 0; k < copyLength; ++k) {
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ringBuffer[dst++] = ringBuffer[src++];
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}
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state.j += copyLength;
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state.metaBlockLength -= copyLength;
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state.pos += copyLength;
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} else {
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for (; state.j < state.copyLength;) {
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ringBuffer[state.pos] =
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ringBuffer[(state.pos - state.distance) & ringBufferMask];
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state.metaBlockLength--;
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state.j++;
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if (state.pos++ == ringBufferMask) {
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state.nextRunningState = COPY_LOOP;
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state.bytesToWrite = state.ringBufferSize;
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state.bytesWritten = 0;
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state.runningState = WRITE;
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break;
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}
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}
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}
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if (state.runningState == COPY_LOOP) {
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