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From: Jonathan Wakely <redi@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r12-7589] libstdc++: Support VAX floats in std::strong_order Date: Thu, 10 Mar 2022 11:50:44 +0000 (GMT) [thread overview] Message-ID: <20220310115044.D61EE3858429@sourceware.org> (raw) https://gcc.gnu.org/g:cfaa2fac42f6f4bddb197dc1fc601f2ba136f9f0 commit r12-7589-gcfaa2fac42f6f4bddb197dc1fc601f2ba136f9f0 Author: Jonathan Wakely <jwakely@redhat.com> Date: Tue Mar 8 12:15:55 2022 +0000 libstdc++: Support VAX floats in std::strong_order The VAX float and double format does not support NaN, so the std::partial_ordering returned by <=> will never be 'unordered'. We can just use the partial_ordering value as the strong_ordering. libstdc++-v3/ChangeLog: * libsupc++/compare (_Strong_ordering::_S_fp_cmp) [__vax__]: Use <=> comparison. Diff: --- libstdc++-v3/libsupc++/compare | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/libstdc++-v3/libsupc++/compare b/libstdc++-v3/libsupc++/compare index 050cf7ed20d..3c22d9addf1 100644 --- a/libstdc++-v3/libsupc++/compare +++ b/libstdc++-v3/libsupc++/compare @@ -843,6 +843,11 @@ namespace std static constexpr strong_ordering _S_fp_cmp(_Tp __x, _Tp __y) noexcept { +#ifdef __vax__ + // VAX format has no NaN, only "excess" for Inf, so totally ordered. + return __builtin_bit_cast(strong_ordering, __x <=> __y); +#endif + auto __ix = _S_fp_bits(__x); auto __iy = _S_fp_bits(__y);
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