RFR(S) JDK-8181810 PPC64: Leverage extrdi for bitfield extract
martin.doerr at sap.com
Tue Jun 20 09:50:12 UTC 2017
nice change. I have reviewed it and didn't see any mistakes. We will build and test it, too.
I can also sponsor it after a 2nd review.
Thanks and best regards,
From: hotspot-dev [mailto:hotspot-dev-bounces at openjdk.java.net] On Behalf Of Matthew Brandyberry
Sent: Montag, 19. Juni 2017 18:35
To: hotspot-dev at openjdk.java.net
Subject: Re: RFR(S) JDK-8181810 PPC64: Leverage extrdi for bitfield extract
Apologies for the bad cut-and-paste job.. the body of this review
read as follows:
This is a PPC-specific hotspot optimization that leverages the extrdi
for bitfield extract operations (shift-right and mask-with-and). It
~25% improvement measured via a microbenchmark.
On 6/19/17 11:30 AM, Matthew Brandyberry wrote:
> This is a PPC-specific hotspot optimization that leverages the
> instructions for for movement between general purpose and floating point
> registers (rather than through memory). It yields a ~35% improvement
> via a microbenchmark.
> Please review:
> Bug: https://bugs.openjdk.java.net/browse/JDK-8181809
> Webrev: http://cr.openjdk.java.net/~gromero/8181809/v1/
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