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[Bug math/22902] float128 test failures with GCC 8
- From: "joseph at codesourcery dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 27 Feb 2018 22:46:22 +0000
- Subject: [Bug math/22902] float128 test failures with GCC 8
- Auto-submitted: auto-generated
- References: <bug-22902-131@http.sourceware.org/bugzilla/>
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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