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[Bug middle-end/80917] missed bit information propagation
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 30 May 2017 08:22:41 +0000
- Subject: [Bug middle-end/80917] missed bit information propagation
- Auto-submitted: auto-generated
- References: <bug-80917-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80917
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-05-30
CC| |rguenth at gcc dot gnu.org
Component|rtl-optimization |middle-end
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
We don't do conditional bit-tracking, it would be possible to use the CCP code
to track a separate bit lattice in [E]VRP whose propagators are more capable.
On RTL I think we do not track nonzero bits across BBs but I'm not sure.