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Speedup Java decoder. (#547)

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* geo corpus decodes ~5% faster
 * fetchlogs corpus decodes ~25% faster
This commit is contained in:
Eugene Kliuchnikov 2017-05-07 17:13:03 +02:00 committed by GitHub
parent a015b42683
commit 4363f2d74b
1 changed files with 23 additions and 12 deletions
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13
java/org/brotli/dec/Decode.java
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@ -759,10 +759,20 @@ final class Decode {
state.runningState = COPY_LOOP; state.runningState = COPY_LOOP;
// fall through // fall through
case COPY_LOOP: case COPY_LOOP:
int src = (state.pos - state.distance) & ringBufferMask;
int dst = state.pos;
int copyLength = state.copyLength - state.j;
if ((src + copyLength < ringBufferMask) && (dst + copyLength < ringBufferMask)) {
for (int k = 0; k < copyLength; ++k) {
ringBuffer[dst++] = ringBuffer[src++];
}
state.j += copyLength;
state.metaBlockLength -= copyLength;
state.pos += copyLength;
} else {
for (; state.j < state.copyLength;) { for (; state.j < state.copyLength;) {
ringBuffer[state.pos] = ringBuffer[state.pos] =
ringBuffer[(state.pos - state.distance) & ringBufferMask]; ringBuffer[(state.pos - state.distance) & ringBufferMask];
// TODO: condense
state.metaBlockLength--; state.metaBlockLength--;
state.j++; state.j++;
if (state.pos++ == ringBufferMask) { if (state.pos++ == ringBufferMask) {
@ -773,6 +783,7 @@ final class Decode {
break; break;
} }
} }
}
if (state.runningState == COPY_LOOP) { if (state.runningState == COPY_LOOP) {
state.runningState = MAIN_LOOP; state.runningState = MAIN_LOOP;
} }