https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88024
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-11-15
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, this will be somewhat difficult to implement given it mixes option
processing and pass list processing. Consider also
-O2 -fno-tree-loop-optimize -ftree-loop-vectorize
where -ftree-loop-vectorize has no effect because vectorization sits in
a pass group that is guarded by -ftree-loop-optimize.
That said it would indeed be nice to have flag "dependences" recorded
somewhere but without duplication in two places (passes.def and elsewhere).
Because that will very likely bitrot.
So I don't like to see the "obvious" fix of adding sth to common.opt like
ftree-pre
Common Report Var(flag_tree_pre) Optimization NotO0 NotOg
Enable SSA-PRE optimization on trees.
Similar it would eventually be nice to diagnose
-O3 -ftree-loop-vectorize -Woptions
note: -ftree-loop-vectorize is already enabled by -O3
-O2 -fno-tree-loop-vectorize -Woptions
note: -ftree-loop-vectorize was not enabled
(not by default)
Just to note what kind of meta-info is missing.
