[patch] Split up expand_case

[Richard Guenther]

On Wed, Jul 4, 2012 at 8:42 AM, Steven Bosscher <stevenb.gcc@gmail.com> wrote:
> Hello,
>
> The attached patch splits out the code generation bits from
> expand_case to two new functions, emit_case_decision_tree and
> emit_case_dispatch_table.
>
> I also added some bits of new code to help me better understand how
> the code generation for decision trees works (I took dump_case_nodes
> taken from a patch by DJ that somehow never made it in [1]), and I've
> added a lot of comments about where certain magic numbers originated.
>
> While working on this, I noticed that one of the switch test cases
> optimizes to an empty function, so I changed this test case. Also,
> some try_casesi ATTRIBUTE_UNUSED markers are no longer necessary.
>
> Bootstrapped&tested on powerpc64-unknown-linux-gnu. OK for trunk?

Ok.

Thanks,
Richard.

> Ciao!
> Steven
>
> [1] http://gcc.gnu.org/ml/gcc-patches/2004-07/msg02479.html