[LLVMdev] How to deal with wider Integer type?

[Chandler Carruth]

Yes, the LLVM backend does type legalization on the SelectionDAG formed
from the LLVM IR. This eliminates too-wide integer types by decomposing the
operations.

However, SROA never produces an integer wider than what was used in the
input IR that I know of... I would be surprised if GVN did this either.


On Wed, Sep 3, 2014 at 10:53 PM, Ruiling Song <ruiling.song83 at gmail.com>
wrote:

> Hi,
>
> I am currently working on an opencl project based on LLVM, the target
> device is 32bit.
> I met a problem that some llvm passes like GVN SROA will generate some IR
> operating
> on wide integer types like i128 or i512. But the device does not support
> such kind of data type.
> Is there any idea on how to lower this kind of IR to only operate on i32
> or vector of i32? Or is there any existing code handle this?
>
> Thanks!
> Ruiling
>
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