https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113578
--- Comment #15 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:ee9f00606f184be37d6f9df74cc7e222157c7fee commit r15-3903-gee9f00606f184be37d6f9df74cc7e222157c7fee Author: Jonathan Wakely <jwak...@redhat.com> Date: Tue Jan 30 14:47:34 2024 +0000 libstdc++: Preserve signbit of nan when converting float to double [PR113578] LWG 117 specifies that inserting a float into an ostream should cast it to double, because there's no std::num_put::put member that takes a float. However, on RISC-V converting a NaN float to double loses the sign, which means that negative NaN floats are printed as positive. This has been reported as LWG 4101 and there is good support for fixing the standard to preserve the sign bit when printing negative NaN values. This change uses copysign((double)f, (double)std::bit_cast<int>(f)) to get a double that preserves the sign. The bit_cast gives us an integer with the same signbit, and casting that to the target type preserves the signbit. We don't care about the value, as copysign only uses the signbit. The inserters for extended floating-point types need the same treatment, so add a new _S_cast_flt helper to do the signbit-preserving conversion generically. So far only RISC-V has been confirmed to need this treatment, but we might need to extend it to other targets later. libstdc++-v3/ChangeLog: PR libstdc++/113578 * include/std/ostream (_S_cast_flt): New static member function to restore signbit after casting to double or long double. (operator<<(float), operator<<(_Float16), operator<<(_Float32)) (operator<<(_Float64), operator(_Float128)) (operator<<(__bfloat16_t)): Use _S_cast_flt. testsuite/27_io/basic_ostream/inserters_arithmetic/lwg4101.cc: New test. Co-authored-by: Andrew Waterman <and...@sifive.com>
