[Bug target/110979] Miss-optimization for O2 fully masked loop on floating point reduction.

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110979

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 62842
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62842&action=edit
patch

This is where I left off, with a few remaining FAILs (aka ICEs).  Low priority,
shouldn't happen by default.