llvm dev - May 2006 - [LLVMdev] Conflicting passes?

Hi,
> On Tue, 2 May 2006, Domagoj D wrote:
> > Why are these two passes conflicting: UnifyFunctionExitNodes and
LowerSwitch?
> 
> Because they invalidate each other.  Neither preserves the other.
> 
> -Chris
I thought so. However, it's not clear to me why "preservation" is
required at all?
That's just an optimization. The PassManager should be able to run passes
with
interdependencies by serializing them (for example in the order as they were
added to the queue).

This way, users simply have no other choice but to write batch scripts, unless
if I'm missing something.

Domagoj


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On Wed, 3 May 2006, Domagoj D wrote:
> I thought so. However, it's not clear to me why
"preservation" is required at all?
> That's just an optimization. The PassManager should be able to run
passes with
> interdependencies by serializing them (for example in the order as they
were
> added to the queue).
>
> This way, users simply have no other choice but to write batch scripts,
unless
> if I'm missing something.
Please read:
http://llvm.org/docs/WritingAnLLVMPass.html

carefully.

-Chris

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