[Bug 276961] buildworld artifacts not reproducible between native and cross build

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276961

--- Comment #21 from commit-hook@FreeBSD.org ---
A commit in branch stable/13 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=814641415fbee707b312c334e00a1ebb5157e37b

commit 814641415fbee707b312c334e00a1ebb5157e37b
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2024-07-28 11:13:37 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2024-07-31 07:29:59 +0000

    Merge commit c80c09f3e380 from llvm-project (by Dimitry Andric):

      [CalcSpillWeights] Avoid x87 excess precision influencing weight result

      Fixes #99396

      The result of `VirtRegAuxInfo::weightCalcHelper` can be influenced by
      x87 excess precision, which can result in slightly different register
      choices when the compiler is hosted on x86_64 or i386. This leads to
      different object file output when cross-compiling to i386, or native.

      Similar to 7af3432e22b0, we need to add a `volatile` qualifier to the
      local `Weight` variable to force it onto the stack, and avoid the excess
      precision. Define `stack_float_t` in `MathExtras.h` for this purpose,
      and use it.

    This is the version of the fix for PR276961 that landed upstream.

    PR:             276961
    Reported by:    cperciva
    MFC after:      3 days

    (cherry picked from commit 1a4b8325f6e3a45c77188343da504fe04495cc46)

 contrib/llvm-project/llvm/include/llvm/Support/MathExtras.h |  8 ++++++++
 contrib/llvm-project/llvm/lib/CodeGen/CalcSpillWeights.cpp  | 11 ++++++-----
 2 files changed, 14 insertions(+), 5 deletions(-)

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