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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/104582] [11/12 Regression] Unoptimal code for
 __negdi2 (and others) from libgcc2 due to unwanted vectorization
Date: Fri, 18 Feb 2022 08:53:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104582

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, I think it makes sense to build libgcc with -mno-sse, maybe even
-mgeneral-regs-only.  Or globally with -fno-tree-vectorize (but we likely do
not want
%xmm uses for parameter setup either with the move-by-pieces changes - IIRC
I've seen uses in the unwinder code trapping because of a misaligned stack
in an executable).=