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From: "steve at sk2 dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/54412] minimal 32-byte stack alignment with -mavx on
 64-bit Windows
Date: Fri, 01 Apr 2022 16:27:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D54412

Stephen Kitt <steve at sk2 dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |steve at sk2 dot org

--- Comment #35 from Stephen Kitt <steve at sk2 dot org> ---
Created attachment 52737
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D52737&action=3Dedit
Use unaligned VMOV instructions (for Windows targets)

The reason I didn't submit the Debian patch is that it unconditionally repl=
aces
V...{U,A} with V...U instructions. That's fine when we know the target needs
something like that, which is the case when we're building a Windows
cross-compiler; but I don't think it's suitable for general use as-is. It w=
ould
need a build-time conditional at the very least.

Anyway, I'll add it as an attachment here; I'll try to find time to make it
generally applicable. I haven't filed copyright assignment paperwork for me
personally; if the patch needs it, consider it submitted by skitt@redhat.com
under the corporate copyright assignment agreement.=