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On Wed, Apr 24, 2013 at 5:26 PM, Chris Lattner <clattner at apple.com> wrote: > On Apr 24, 2013, at 5:01 PM, Dan Gohman <dan433584 at gmail.com> wrote: > > In the spirit of the (long-term) intent to migrate away from the > SelectionDAG framework, it is desirable to implement legalization passes as > discrete passes. Attached is a patch which implements the beginning of

..... > > > I don't wish to argue about this, and am fine following your suggestion. > However, I would like to understand your reasons better. > What would be the plan as far as incrementally achieving this alternate implementation? Why has " avoiding having LLVM-IR-level optimization passes which lower the IR, which has historically been a design goal of LLVM"?

On Apr 24, 2013, at 5:01 PM, Dan Gohman <dan433584 at gmail.com> wrote: > In the spirit of the (long-term) intent to migrate away from the SelectionDAG framework, it is desirable to implement legalization passes as discrete passes. Attached is a patch which implements the beginning of a new type legalization pass, to help motivate discussion. This is a great discussion to have. > Is

In the spirit of the (long-term) intent to migrate away from the SelectionDAG framework, it is desirable to implement legalization passes as discrete passes. Attached is a patch which implements the beginning of a new type legalization pass, to help motivate discussion. Is LLVM IR the right level for this? The main alternative approach that's been discussed is to do FastISel to a