llvm dev - Oct 2008 - [LLVMdev] Local common subexpression elimination

Hi all,

 

Is there any existing pass that performs fast local common subexpression
elimination?

 

The reason I'm asking is because global common subexpression elimination
(GVN or GVN-PRE) is too slow for my JIT purposes, but I see lots of value in
local CSE.

 

Thanks,

 

Nicolas

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On Oct 15, 2008, at 8:55 PM, Nicolas Capens wrote:
> Hi all,
>
> Is there any existing pass that performs fast local common  
> subexpression elimination?
>
> The reason I’m asking is because global common subexpression  
> elimination (GVN or GVN-PRE) is too slow for my JIT purposes, but I  
> see lots of value in local CSE.
What kinds of expressions? SelectionDAG does essentially what you want  
automatically when nodes are created.

Evan
>
> Thanks,
>
> Nicolas
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