[LLVMdev] Why are imm shifts where imm >= width type eliminated entirely?

[Matthias Braun]

There can also be other “problems" like this one: http://reviews.llvm.org/D6946 <http://reviews.llvm.org/D6946>

- Matthias

> On Apr 20, 2015, at 1:44 PM, Tim Northover <t.p.northover at gmail.com> wrote:
> 
>> The DAG combiner also performs the undefined shift -> undef though, so it
>> should still be OK
> 
> DAG combiner doesn't really run to convergence as far as I'm aware, so
> you often get extremely difficult to test but necessary checks like
> this.
> 
> Tim.
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