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[Bug math/22902] float128 test failures with GCC 8


https://sourceware.org/bugzilla/show_bug.cgi?id=22902

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I suspect a GCC bug.

These functions rely on knowing that libgcc's soft-fp for float128 uses 
the x87 rounding mode for 32-bit but the SSE rounding mode for 64-bit - 
but that's not changed at all in GCC 8.  They also rely on expressions 
being evaluated at the right time between floating-point environment 
changes, but the uses of math_force_eval and math_opt_barrier in 
math-narrow.h are intended to ensure that.

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