[Bug middle-end/124086] [16 Regression] during GIMPLE pass: cplxlower: ICE: verify_gimple failed: 'vector_cst' as base where non-register is required at -O1 with _Complex long double and vector

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124086

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
VIEW_CONVERT_EXPR of register type needs to be outermost.  gimplification would
take care of that, but manually doing it requires some extra care.  Possibly
gimple_build (...) does not properly handle it?