[Bug rtl-optimization/98178] Combine splitter does not split to single instruction

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98178

--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
On a related note, the combine splitter is a very mysterious beast, and does
not easily tell, why the particular combination is rejected. Without any debug
in debug logs it is very frustrating to figure out the reason.