https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99835
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hubicka at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Component|tree-optimization |ipa
Last reconfirmed| |2021-03-31
Keywords| |missed-optimization
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Version|unknown |11.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
At -O3 the unused 'c' remains. Likely different (recursive?) inlining makes us
process a cgraph cycle in different order and thus fail to elide the output
of 'c' (it's output first at -O3).
Fixing that would need processing cgraph SCCs with an extra IPA phase in main
optimization so we get a chance to do extra node removal (maybe order
the cycles so that functions we can elide - aka static ones - are processed
last).
