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BITOP speedup when or/and output is 0/255, stop processing further keys (#8110)

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when performing the and operation, if the output is 0, we can jump out of the loop.
when performing an or operation, if the output is 0xff, we can jump out of the loop.
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sundb 2020-12-01 05:03:53 +08:00 committed by GitHub
parent d322e7baba
commit 04056b767f
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 2 deletions
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15
src/bitops.c
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@ -735,12 +735,23 @@ void bitopCommand(client *c) {
output = (len[0] <= j) ? 0 : src[0][j];
if (op == BITOP_NOT) output = ~output;
for (i = 1; i < numkeys; i++) {
int skip = 0;
byte = (len[i] <= j) ? 0 : src[i][j];
switch(op) {
case BITOP_AND: output &= byte; break;
case BITOP_OR: output |= byte; break;
case BITOP_AND:
output &= byte;
skip = (output == 0);
break;
case BITOP_OR:
output |= byte;
skip = (output == 0xff);
break;
case BITOP_XOR: output ^= byte; break;
}
if (skip) {
break;
}
}
res[j] = output;
}