(original) (raw)

The new algorithm is slightly slower because of branch misprediction.

old: 2.17 IPC, 0.08% branch-misses, 91,965,281,215 cycles
new: 1.23 IPC, 6.11% branch-misses, 99,925,255,682 cycles

...but it executes fewer instructions so we're only talking about
some 10% slowdown. I think this is the worst case (or something
close to the worst case) for the new algorithm.

So, I think we're OK performance-wise.

John: I'm waiting for an answer to my question here before I submit
a webrev for approval.

http://mail.openjdk.java.net/pipermail/panama-dev/2015-March/000099.html

(Answered.)