[Bug 207736] clang 3.8.0/powerpc/powerpc64's _Unwind_RaiseException code generation has messed up r31 (frame pointer) save/restore code (SEGV's can result)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207736

--- Comment #2 from Mark Millard <markmi at dsl-only.net> ---
As of clang 3.9.1 TARGET_ARCH=powerpc still has some
R31 restoration problems when floating point code is
also involved:

R31 is restored but later floating-point cleanup
code is based on R31 not having been restored yet.
In other words: R31 is restored too early.

This is not specific to _Unwind_RaiseException .

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