[llvm-commits] [PATCH] Defer some shl transformations from InstCombine to DAGCombine

[Jakob Stoklund Olesen]

On Apr 18, 2012, at 4:51 PM, Chandler Carruth <chandlerc at google.com> wrote:

> Cool, one somewhat unrelated question...
> 
> On Wed, Apr 18, 2012 at 4:48 PM, Jakob Stoklund Olesen <stoklund at 2pi.dk> wrote:
> > Can we add a test for the LSR usage as well? Maybe using the same pattern as above?
> 
> LSR is using SCEV, so I am not so worried about that. LSR tests are also tricky because it needs target information, so it can only be run from llc.
> 
> Does the newly added '-mtriple' flag to opt allow us to give LSR the targetinfo it needs? If not, could we add an opt flag to make this easier? Just a random thought.

I don't think it works, unfortunately.

LSR needs a TargetLoweringInfo pointer, and opt -mtriple only sets the Module triple. I think it might be a library dependency issue?

It is possible to run llc -print-lsr-output, though. You'll get IR followed by assembly.

/jakob

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