[Bug rtl-optimization/87485] [9 Regression] Compile time hog w/ -O2 -fschedule-insns -fno-guess-branch-probability -fno-isolate-erroneous-paths-dereference -fno-omit-frame-pointer -fno-split-wide-types -fno-tree-ccp -fno-tree-sra

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87485

--- Comment #23 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Because these testcases uncover real problems in the code base, please see
> comment #19.

But there are hundreds open PRs in the database for *real* code with
*realistic* combinations of options.  This one is not one of them.

Regarding -fschedule-insns, there was quite some work done some
> years ago to enable this option on x86, so by fixing PRs involving
> -fchedule-insns, we are inching closer to enabling it by default.

IMO it will really be usable only when they double again the # of registers.