Added getUnsafe and addUnsafe, two methods that skip checks.
The checks are not needed in unionSorted, because we made
sure the code works correctly. getUnsafe still has the checks,
but as assertions.
The speedup is roughly 20%. Here are some results for calling
union 2^16 times for two random sorted lists with 16k
elements:
Duration: 20170 -> 16857 (83.57%)
Instructions: 138.277.743.679 -> 108.474.027.213 (78.4%)
Instructions per cycle: 2,33 -> 2,18
Branches: 30.248.330.644 -> 19.908.207.057 (65.8%)
Branch Misses: 3.012.427 -> 3.477.433
Cycles per list element: 65.93 -> 51.72 (78.4%)
Created with (the test program is not committed) on a Core2Duo 8600:
perf stat -d -d -d --delay 2000 java -cp bin/test:bin/main
org.lucares.collections.Test 16000 16
andi
cedccefe92