#8014320 would benefit from #5100935 (original) (raw)
Joe Darcy joe.darcy at oracle.com
Sun Mar 23 18:09:44 UTC 2014
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Hello,
The description of 5100935 is:
JDK-5100935 No way to access the 64-bit integer multiplication of 64-bit CPUs efficiently
From the most recent comment in the bug, the straw-man API for this is something like:
For the (int, int) -> long case, "multiplyFull". For the high bits of (long, long) -> long, "multiplyHigh
with expected VM intrinsification.
FWIW, I'd like to see this API included in JDK 9.
-Joe
On 3/23/2014 3:06 AM, Tim Buktu wrote:
Posting to the list because I can't add comments on http://bugs.openjdk.java.net.
I just wanted to point out that if #5100935 were implemented, it would allow for a speed improvement of an estimated 20% for SS multiplication in the 20,000 - 80,000 digit range. There are other improvements to 8014320 that could be done now, but they would only make a difference well into the 100,000s of digits. Tim
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