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[Bug tree-optimization/81953] Code sinking increases register pressure
- From: "pthaugen at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 24 Aug 2017 20:53:05 +0000
- Subject: [Bug tree-optimization/81953] Code sinking increases register pressure
- Auto-submitted: auto-generated
- References: <bug-81953-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81953
--- Comment #4 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #3)
> The interesting part is also why RTL scheduling doesn't rectify things
> here?
If you're referring to -fsched-pressure, I believe the answer is that those
algorithms are concerned about the case where pressure is more than available
hard regs, which is not the case here.