On Mon, 10 Apr 2023 15:11:55 GMT, Jatin Bhateja <jbhat...@openjdk.org> wrote:
>> Thanks a lot for your review, I think that transforming a multiplication by >> a power of 2 into a shift can be done by the C2 compiler. I have added the >> special case for `start = 0 && step == 1` since it may be more common and >> can be optimised away when the arguments are constants. > > For x86 byte vector multiplication is done at granularity of short lanes, > this case shows regression with power of two multiplications which are > strength reduced to shifts currently. please file a follow up bug report for > this. @jatin-bhateja I have created [JDK-8305810](https://bugs.openjdk.org/browse/JDK-8305810) ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/13093#discussion_r1161976583
