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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/61837] missed loop invariant expression optimization
Date: Tue, 14 Apr 2020 10:37:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D61837

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note the unswitching pass has special code to hoist guards of inner loops
steming from loop header copying.  That could possibly be enabled at -O2
since it doesn't come with a size penalty due to loop copying (the code size
issue is the reason we don't unswitch at -O2 - yes, creating non-perfect
nests might be another good reason).=