RFR: 8240669: Devirtualize Relocation::type

Rickard Bäckman rickard.backman at oracle.com
Tue Mar 10 06:53:19 UTC 2020


Looks good!

/R

On 03/08, Claes Redestad wrote:
> Hi,
> 
> devirtualizing Relocation::type() means a throughput increase in places such
> as Assembler::emit_operand (-15% instructions, fewer branches), due
> enabling more aggressive inlining.
> 
> Several of these places are sensitive to startup/warmup. For example
> paths taken when generating the interpreter, runtime adapters and by C1
> improve, and the refactoring here has a measurable win on #instructions,
> #branches (-0.4% on Hello World) etc, on a range of startup tests.
> 
> Bug:    https://bugs.openjdk.java.net/browse/JDK-8240302
> Webrev: http://cr.openjdk.java.net/~redestad/8240669/open.00/
> 
> Testing: tier1-5
> 
> Thanks!
> 
> /Claes


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