Re: [PATCH] Enable auto-vectorization at O2 with very-cheap cost model.

[Jakub Jelinek via Gcc-patches]

On Mon, Sep 06, 2021 at 07:15:41PM +0800, Hongtao Liu wrote:
> > So what about finish_options then?
> > default_options_optimization has only a single caller that then calls
> > read_cmdline_options and then finish_options.
> in finish_options
> (gdb) p opts_set->x_flag_tree_loop_vectorize
> $37 = 1
> with -O2 -ftree-loop-vectorize,
> 
> but
> 1000   if (opts->x_dump_base_name
> (gdb) p opts_set->x_flag_tree_loop_vectorize
> $38 = 0
> for -O2 -ftree-vectorize???
> 
> Any magic  for ftree-vectorize w/ EnabledBy???

I guess a way to get this working would be:
 ; Alias to enable both -ftree-loop-vectorize and -ftree-slp-vectorize.
 ftree-vectorize
-Common Optimization
+Common Var(flag_tree_vectorize) Optimization
 Enable vectorization on trees.

and then you can test both
opts_set->x_flag_tree_vectorize
and
opts_set->x_flag_tree_loop_vectorize

        Jakub