[llvm] r176136 - Have a way for a target to opt-out of target-independent fast isel

[Eric Christopher]

On Tue, Feb 26, 2013 at 8:37 PM, Michael Ilseman <milseman at apple.com> wrote:

>
> On Feb 26, 2013, at 3:30 PM, Eli Bendersky <eliben at google.com> wrote:
>
> > Can you provide more background for this change? Is it being done for
> > the sake of debugging? What are the intended use cases?
> >
>
> Sure! Debugging can definitely be improved by this, but this also gives
> targets more flexibility. Targets can fast-isel better code with more
> coverage in some situations. For example, SelectOperator(), even when it
> returns false, has side-effects and can schedule IR instructions to be
> fast-iselled that otherwise never would. This becomes particularly
> unfortunate when such instructions trigger the DAG slow-path.
>
>
Is there anything that's going to be using this any time soon? Something
that doesn't use the target independent fast isel path?

-eric
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