RFR(L): 8130654: ppc: implement MultiplyToLen intrinsic

[Lindenmaier, Goetz]

Hi Volker, 

thanks for looking at this!
I fixed frame_ppc and ppc.ad.  I also use R1_SP
in stubGenerator. 

But I left the use of the registers as is.  As the registers
spilled contain 'real' values and can only be used as
temp after they are spilled.  I think this is expressed by 
the current wording quite well.

updated webrev:
http://cr.openjdk.java.net/~goetz/webrevs/8130654-mulToLen/webrev.02/

Best regards,
  Goetz. 

-----Original Message-----
From: Volker Simonis [mailto:volker.simonis at gmail.com] 
Sent: Freitag, 10. Juli 2015 16:48
To: Lindenmaier, Goetz
Cc: hotspot-dev at openjdk.java.net; Januschke, Peter
Subject: Re: RFR(L): 8130654: ppc: implement MultiplyToLen intrinsic

Hi Goetz,

the change looks good.

I have just a few minor remarks:

frame_ppc.inline.hpp
- please update the copyright year

vm_version_ppc.cpp
- you removed UseNewFastLockPPC64 - can you please also remove the
last occurrence in  ppc.ad

stubGenerator_ppc.cpp
- once you already declared the various temp registers, maybe you can
also use these temp names for spilling? This could avoid potential
problems if somebody changes one of the temp registers. And you could
also use R1_SP instead of R1 to make it more clear that R1 is the SP.

Regards,
Volker


On Tue, Jul 7, 2015 at 10:47 AM, Lindenmaier, Goetz
<goetz.lindenmaier at sap.com> wrote:
> Hi,
>
> Peter ported the multiplyToLen intrinsic for ppc.
> Please review this change
> http://cr.openjdk.java.net/~goetz/webrevs/8130654-mulToLen/webrev.01/
>
> We tested this with jck, jtreg and our benchmarks on aix, ppc64 and ppc64le.
>
> Best regards,
>   Goetz.