[15] RFR (M): 8238690: C2: Handle vector shifts by constant and non-constant scalar uniformly
Viswanathan, Sandhya
sandhya.viswanathan at intel.com
Fri Feb 7 18:15:49 UTC 2020
Hi Vladimir,
Your patch looks good to me.
Best Regards,
Sandhya
-----Original Message-----
From: Vladimir Ivanov <vladimir.x.ivanov at oracle.com>
Sent: Friday, February 07, 2020 6:49 AM
To: hotspot compiler <hotspot-compiler-dev at openjdk.java.net>
Cc: Viswanathan, Sandhya <sandhya.viswanathan at intel.com>; Bhateja, Jatin <jatin.bhateja at intel.com>
Subject: [15] RFR (M): 8238690: C2: Handle vector shifts by constant and non-constant scalar uniformly
http://cr.openjdk.java.net/~vlivanov/8238690/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8238690
Unify IR shape for vector shifts by scalar and always use:
ShiftV src (ShiftCntV shift)
Right now, constant case has a special representation:
ShiftV src ConI
It allows to simplify generic vector logic a bit and get rid of auxilliary chain rule on x86 (vshiftcntimm).
Testing: tier1-4
Best regards,
Vladimir Ivanov
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