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 release/18.x llvmorg-18.1.6-0-g1118c2e05e67

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.6-0-g1118c2e05

Merge llvm-project release/18.x llvmorg-18.1.6-0-g1118c2e05e67

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.6-0-g1118c2e05e67.

PR: 276104
MFC after: 3 days

(cherry picked from commit 3a0793336edfc21cb6d4c8c5c5d7f1665f3e6c5a)

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Merge llvm-project release/18.x llvmorg-18.1.5-0-g617a15a9eac9

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.5-0-g617a15a9e

Merge llvm-project release/18.x llvmorg-18.1.5-0-g617a15a9eac9

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.5-0-g617a15a9eac9.

PR: 276104
MFC after: 3 days

(cherry picked from commit 5678d1d98a348f315453555377ccb28821a2ffcd)

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Merge llvm-project release/18.x llvmorg-18.1.4-0-ge6c3289804a6

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.4-0-ge6c328980

Merge llvm-project release/18.x llvmorg-18.1.4-0-ge6c3289804a6

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.4-0-ge6c3289804a6.

PR: 276104
MFC after: 3 days

(cherry picked from commit dfa39133b333f57ca3133bf6c71cd75be4c3e801)

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Merge llvm-project release/18.x llvmorg-18.1.0-rc2-53-gc7b0a6ecd442

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.0-rc2-53-

Merge llvm-project release/18.x llvmorg-18.1.0-rc2-53-gc7b0a6ecd442

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.0-rc2-53-gc7b0a6ecd442.

PR: 276104
MFC after: 1 month

(cherry picked from commit 74626c16ff489c0d64cf2843dfd522e7c544f3ce)

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Merge llvm-project release/18.x llvmorg-18.1.0-rc2-0-gc6c86965d967

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.0-rc2-0-gc

Merge llvm-project release/18.x llvmorg-18.1.0-rc2-0-gc6c86965d967

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.0-rc2-0-gc6c86965d967.

PR: 276104
MFC after: 1 month

(cherry picked from commit b3edf4467982447620505a28fc82e38a414c07dc)

show more ...