[aarch64-port-dev ] RFR: 8252259: AArch64: Adjust default value of FLOATPRESSURE

[Ningsheng Jian]

Pushed.

Regards,
Ningsheng

> -----Original Message-----
> From: Joshua Zhu <yueshi.zwj at alibaba-inc.com>
> Sent: Wednesday, August 26, 2020 5:05 PM
> To: 'Andrew Haley' <aph at redhat.com>; hotspot-compiler-dev at openjdk.java.net;
> Ningsheng Jian <Ningsheng.Jian at arm.com>
> Cc: aarch64-port-dev at openjdk.java.net
> Subject: RE: [aarch64-port-dev ] RFR: 8252259: AArch64: Adjust default value of
> FLOATPRESSURE
> 
> Andrew, thanks a lot for your review.
> Ningsheng, could you please help push this change?
> 
> Best Regards,
> Joshua
> 
> > -----Original Message-----
> > From: Andrew Haley <aph at redhat.com>
> > Sent: 2020年8月25日 19:53
> > To: Joshua Zhu <yueshi.zwj at alibaba-inc.com>; hotspot-compiler-
> > dev at openjdk.java.net
> > Cc: aarch64-port-dev at openjdk.java.net
> > Subject: Re: [aarch64-port-dev ] RFR: 8252259: AArch64: Adjust default
> > value of FLOATPRESSURE
> >
> > On 25/08/2020 07:03, Joshua Zhu wrote:
> > > Therefore I propose the default value of FLOATPRESSURE be 32 because
> > > there are 32 float/SIMD registers on aarch64 and also the value of
> > > register pressure is the same as 1 for each LRG of
> > > Op_RegL/Op_RegD/Op_Vec. [3]
> > >
> > > Could you please help review this change?
> > >
> > > JBS: https://bugs.openjdk.java.net/browse/JDK-8252259
> > > Webrev: http://cr.openjdk.java.net/~jzhu/8252259/webrev.00/
> >
> > Yes, thanks. I can't remember why FLOATPRESSURE is 64, but it
> > certainly looks like 32 is a much more sensible value.
> >
> > --
> > Andrew Haley  (he/him)
> > Java Platform Lead Engineer
> > Red Hat UK Ltd. <https://www.redhat.com>
> > https://keybase.io/andrewhaley
> > EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671