[JSR308] Java compilers that perform common subexpression elimination

[Steven Harris]

Java compilers also do various optimizations for string concat as well.


Cheers,
Steven


On May 18, 2007, at 9:53 PM, Neal Gafter wrote:

> I don't know of any java-to-bytecode compilers that perform  
> optimizing transformations. The only thing javac does even remotely  
> like this is that javac does not generate bytecode for dead code  
> (for example code in the contolled statement of an if(false)  
> generates nothing in the bytecode).
>
> On May 18, 2007 8:57 PM, Michael Ernst <mernst at csail.mit.edu> wrote:
> If a compiler performs common subexpression elimination on two
> (incompatibly-annotated) expressions or statements, then there is  
> no good
> choice for how to annotate the generated classfile.  I am not sure  
> whether
> this is a purely hypothetical problem or a real one.
>
> As a first step in determining this, can someone, or some group of  
> people,
> volunteer to create a catalog of widely used Java-to-bytecode  
> compilers and
> whether they perform this or other problematic optimizations?  (A  
> list of
> other problematic optimizations would also be helpful.)  Even if  
> you can
> only report the results for one compiler, that would be helpful.
>
>                    -Mike
>
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