[Bug rtl-optimization/125456] RTL Loop Unroll AGU Serialization and Redundant IV Increments

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125456

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Unroll w/o "reason" does not make much sense on GIMPLE.  For RTL there's
various bits to tweak it, including -fsplit-ivs-in-unroller,
-fvariable-expansion-in-unroller which can help exposing insn parallelism.