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P3844R2 added consteval conversion for value-preserving conversion from constants. It had been approved by LEWG in Kona. Therefore, the current implementation has the consteval broadcast constructor. In Croydon, LEWG reversed the decision but changed the overload set to keep the design space open for C++29. This patch implements the removal of the consteval constructor and changes the broadcast constructor according to P4012R1, to keep the design space open. libstdc++-v3/ChangeLog: * include/bits/simd_details.h (__value_preserving_cast): Remove. * include/bits/simd_mask.h (basic_mask): Replace plain 0 and 1 literals with cw<0> and cw<1>. Replace explicit basic_vec construction from 0 and 1 with default init and broadcast from _Up(1). (_M_to_uint): Replace 1 with cw<1>. * include/bits/simd_vec.h (basic_vec): Remove consteval broadcast overload. Remove explicit broadcast from non-value-preserving types. * testsuite/std/simd/arithmetic.cc: Replace ill-formed integer literals with explicit cast to T or use cw. * testsuite/std/simd/mask.cc: Likewise. * testsuite/std/simd/simd_alg.cc: Likewise. * testsuite/std/simd/traits_common.cc: Adjust for resulting traits changes. * testsuite/std/simd/traits_math.cc: Likewise. Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
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