RFR(M) 8138892: C1: Improve counter overflow checking

[Vladimir Ivanov]

I'll push it today, Martin.

Best regards,
Vladimir Ivanov

On 11/17/15 12:41 PM, Doerr, Martin wrote:
> Hi Christian,
>
> is this still on your todo list?
>
> Best regards,
>
>    Martin
>
> *From:*Christian Thalinger [mailto:christian.thalinger at oracle.com]
> *Sent:* Mittwoch, 21. Oktober 2015 01:58
> *To:* Lindenmaier, Goetz <goetz.lindenmaier at sap.com>
> *Cc:* Doerr, Martin <martin.doerr at sap.com>; hotspot compiler
> <hotspot-compiler-dev at openjdk.java.net>; Andrew Haley (aph at redhat.com)
> <aph at redhat.com>
> *Subject:* Re: RFR(M) 8138892: C1: Improve counter overflow checking
>
> Sorry, I’m pretty busy but I will try to sponsor this.
>
>     On Oct 11, 2015, at 10:58 PM, Lindenmaier, Goetz
>     <goetz.lindenmaier at sap.com <mailto:goetz.lindenmaier at sap.com>> wrote:
>
>     Hi Martin,
>
>     this change looks good, thank you.
>
>     Could someone please sponsor this?
>
>     Best regards,
>
>        Goetz.
>
>     *From:*hotspot-compiler-dev
>     [mailto:hotspot-compiler-dev-bounces at openjdk.java.net]*On Behalf
>     Of*Doerr, Martin
>     *Sent:*Mittwoch, 7. Oktober 2015 23:02
>     *To:*hotspot compiler; Andrew Haley (aph at redhat.com
>     <mailto:aph at redhat.com>)
>     *Subject:*RFR(M) 8138892: C1: Improve counter overflow checking
>
>     Hi,
>
>     C1 currently loads the Method pointer in the fast path even though
>     it is only required in the overflow case. In addition, stupid code
>     gets generated when the frequency is set to 0 which occurs with -Xcomp.
>
>     The following webrev optimizes that:
>
>     http://cr.openjdk.java.net/~mdoerr/8138892_c1_counter_overflow/webrev.02
>
>     It’s not tested on aarch64.
>
>     Please review this change.  I need a sponsor, please.
>
>     Best regards,
>
>        Martin
>