RFR: 8282024: add EscapeAnalysis statistics under PrintOptoStatistics [v12]

[Vladimir Kozlov]

On Fri, 20 May 2022 07:51:40 GMT, aamarsh <duke at openjdk.java.net> wrote:

>> Escape Analysis and Scalar Replacement statistics were added when the -XX:+PrintOptoStatistics flag is set. All code is placed in `#ifndef Product` block, so this code is only run when creating a debug build. Using renaissance benchmark I ran a few tests to confirm that numbers were printing correctly. Below is an example run:
>> 
>> 
>> No escape = 317, Arg escape = 118, Global escape = 1995 (EA executed in   11.71 seconds)   ** EA stats might be slightly off since objects might be double counted due to iterative EA **
>> Objects scalar replaced = 201, Monitor objects removed = 23, GC barriers removed = 50, Memory barriers removed = 224
>
> aamarsh has updated the pull request incrementally with one additional commit since the last revision:
> 
>   eliminate trailing whitespace

About time statistic. There is flag -XX:+CITime which prints times for all phases in C2 (and C1). For EA it is `_t_escapeAnalysis`. And I see difference in reported times (0.02 vs 0.059).

Your output:

(EA executed in    0.02 seconds)


CITime:

         Escape Analysis:       0.076 s
           Conn Graph:            0.059 s
           Macro Eliminate:       0.027 s


I simply run fastdebug VM with -Xcomp:

java -XX:+PrintOptoStatistics -XX:+CITime -Xcomp t

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PR: https://git.openjdk.java.net/jdk/pull/8019