Hojun-Cho 7e19d282f4 wcc/cgen: S1 loud-stop subset-cast tagged widen in let+return (wwstage align to cstage #35) ...

A widening sub-union cast (return/let `v: inner` into a union whose member
is the nested `inner`) skipped the nested widen arm and emitted tag=0 (a
2nd-variant value returned the wrong payload). cstage loud-stops #35;
wwstage now matches: cgwidentaggedstorebp louds on the subset cast, and
cgreturn routes genuine-widening tagged returns (rhs TY_TAGGED, ru1!=fu1)
through the widener choke-point so the same loud fires. Same-type returns
stay on the proven passthrough. Faithful inner-tag->outer-index remap
deferred. test/wcc/835 S1 row.

2026-06-09 17:32:06 +09:00

9.8 KiB

Raw Blame History

View Raw