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Re: Cross-class inlining


So it does !

Only seems to work if I compile the whole system in a single command, though.

Under what circumstances does it do this inlining ?  I tried this:

gcc -O3 -o a.o a.java
gcc -O3 -o b.o b.java a.java
gcc -O3 -o c.o c.java a.java
gcc -O3 -o d.o d.java c.java a.java

etc, where I know (from profiling and hand tinkering) that inlining methods from the rightmost classes in the leftmost ones produced a good speedup.  This didn't seem to work at all.

Still, the "all in 1" approach gets a 49% speedup over just -O3 on individual modules, and 17% better than I could do by hand.

And for your interest, JMTk, the memory management subsystem of Jikes RVM now compiles and runs with gcj.  Still quite limited (only 1 of the JMTk collectors so far), and only in a testbed environment.  Performance, however, is great (and now even better).

Cheers

----- Original Message -----
From: Andrew Haley <aph@redhat.com>
Date: Mon, 20 Oct 2003 18:41:08 +0100
To: "Robin Garner" <robin.garner@iname.com>
Subject: Cross-class inlining

> Robin Garner writes:
> 
>  > I've seen some mention on the list of inter-class inlining being
>  > added to gcj in the near future.  Can someone say more ?  I presume
>  > this is inter-compilation-unit as well as inter-class ?
> 
> It's already there, and it works.
> 
> Try this:
> 
>    gcj -O3 a.java b.java c.java -c -o foo.o
>    gcj foo.o --main=b
> 
> Andrew.

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