https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99668
Drea Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |pinskia at gcc dot gnu.org
--- Comment #3 from Drea Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Roger Sayle from comment #2)
> I'm investigating doing this in the middle-end's expr.cc at RTL expansion
> time, using vec_init_optab to eventually call gen_vec_initv2dfdf, but
> thought I'd mention the above form in case the tree-ssa folks would prefer
> this to be caught earlier (perhaps in match.pd) so that SSA sees:
forwprop has some code to optimize vector constructors. Extending this case
should be easy I think.
I think the best place is in simplify_vector_constructor which basically
recognize things as VEC_PERM_EXPR. Right now it understands extractions from
other vectors but maybe we could treat REALPART_EXPR/IMAGPART_EXPR similar as
extractions from a vector of width 2.
