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Re: Can we replace uses of vec<TYPE, va_gc> with vec<TYPE> in the backwards threader?


On Wed, Aug 30, 2017 at 10:32 AM, Jeff Law <law@redhat.com> wrote:
> On 08/30/2017 04:41 AM, Aldy Hernandez wrote:

> If you're looking for further cleanups, pulling the rest of the FSM bits
> out of tree-ssa-threadupdate.c is ripe.  In particular this loop:
>
>  /* Jump-thread all FSM threads before other jump-threads.  */
>   for (i = 0; i < paths.length ();)
> [ ... ]
>
> If that was to get pulled out and moved into tree-ssa-threadbackwards.c,
> then you can probably skip the step that converts the vector of blocks
> into a vector of jump_thread_edge which then gets turned into an array
> of blocks.  In theory you just turn the vector of blocks into an array
> of blocks to match the api for duplicate_thread_path.

Hmm, it seems that the above loop you mention in
thread_through_all_blocks() still needs to iterate over a global
vec<jump_thread_edge *> vector ("paths").  So we still need to go
through a vector of jump edges.

Aldy


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