RFR: 8262916: Merge LShiftCntV and RShiftCntV into a single node
eliu at openjdk.java.net
Fri Apr 9 10:51:20 UTC 2021
On Fri, 9 Apr 2021 09:26:19 GMT, Andrew Haley <aph at openjdk.org> wrote:
> > It seems that keeping those two RShiftCntV and LShiftCntV is friendly to AArch32/64 in this case, but AArch64 should changed to what AArch32 dose. @theRealAph
> Thanks, but it's been a while since I looked at the vector code. Can you point me to the AArch32 patterns in question, to show me the AArch64 changes needed? Thanks.
AArch32 combinates 'neg' with 'dup' in RShiftCntV, which AArch64 has a single 'dup' only and generates 'neg' before every use sites, e.g. RShiftVB.
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