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

[CalcSpillWeights] Avoid x87 excess precision influencing weight result

Fixes #99396

The result of `VirtRegAuxInfo::weightCal

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)

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Revert "Fix llvm register allocator for native/cross build differences"

In preparation for applying the fix that landed upstream, this reverts
commit 397c2693fa66508cb5e6b173650a1f3bc6c4dd4f:

Fix

Revert "Fix llvm register allocator for native/cross build differences"

In preparation for applying the fix that landed upstream, this reverts
commit 397c2693fa66508cb5e6b173650a1f3bc6c4dd4f:

Fix llvm register allocator for native/cross build differences

Work around an issue in LLVM's register allocator, which can cause
slightly different i386 object files, when produced by a native or cross
build of clang.

This adds another volatile qualifier to a float variable declaration in
the weightCalcHelper() function, which otherwise produces slightly
different float results on amd64 and i386 hosts. In turn, this can lead
to different (but equivalent) register choices, and thus non-identical
assembly code.

See https://github.com/llvm/llvm-project/issues/99396 for more details.

Note this is a temporary fix, meant to merge in time for 13.4. As soon
as upstream has a permanent solution we will import that.

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

(cherry picked from commit 52552d7572a6d3d7d3ce0d6862de9a9d203c5d01)

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Fix llvm register allocator for native/cross build differences

Work around an issue in LLVM's register allocator, which can cause
slightly different i386 object files, when produced by a native or c

Fix llvm register allocator for native/cross build differences

Work around an issue in LLVM's register allocator, which can cause
slightly different i386 object files, when produced by a native or cross
build of clang.

This adds another volatile qualifier to a float variable declaration in
the weightCalcHelper() function, which otherwise produces slightly
different float results on amd64 and i386 hosts. In turn, this can lead
to different (but equivalent) register choices, and thus non-identical
assembly code.

See https://github.com/llvm/llvm-project/issues/99396 for more details.

Note this is a temporary fix, meant to merge in time for 13.4. As soon
as upstream has a permanent solution we will import that.

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

(cherry picked from commit 397c2693fa66508cb5e6b173650a1f3bc6c4dd4f)

show more ...

Merge llvm-project main llvmorg-18-init-15088-gd14ee76181fb

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-15088-gd14ee76181fb.

Merge llvm-project main llvmorg-18-init-15088-gd14ee76181fb

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-18-init-15088-gd14ee76181fb.

PR: 276104
MFC after: 1 month

(cherry picked from commit 5f757f3ff9144b609b3c433dfd370cc6bdc191ad)

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Merge llvm-project release/17.x llvmorg-17.0.0-rc4-10-g0176e8729ea4

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-17.0.0-rc4-10-g0176e8729ea4.

PR: 27375

Merge llvm-project release/17.x llvmorg-17.0.0-rc4-10-g0176e8729ea4

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-17.0.0-rc4-10-g0176e8729ea4.

PR: 273753
MFC after: 1 month

(cherry picked from commit 8a4dda33d67586ca2624f2a38417baa03a533a7f)

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Merge llvm-project main llvmorg-17-init-19304-gd0b54bb50e51

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-17-init-19304-gd0b54bb50e51, t

Merge llvm-project main llvmorg-17-init-19304-gd0b54bb50e51

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-17-init-19304-gd0b54bb50e51, the
last commit before the upstream release/17.x branch was created.

PR: 273753
MFC after: 1 month

(cherry picked from commit 06c3fb2749bda94cb5201f81ffdb8fa6c3161b2e)

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Move all sources from the llvm project into contrib/llvm-project.

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo". That i

Move all sources from the llvm project into contrib/llvm-project.

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo". That is, most of
the earlier separate sub-projects with their own branches and tags were
consolidated into one top-level directory, and are now branched and
tagged together.

Updating the vendor area to match this layout is next.

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