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The following patch updates from fast_float trunk. That way it grabs two of the 4 LOCAL_PATCHES, some smaller tweaks, to_extended cleanups and most importantly fix for the incorrect rounding case, PR107468 aka https://github.com/fastfloat/fast_float/issues/149 Using std::fegetround showed in benchmarks too slow, so instead of doing that the patch limits the fast path where it uses floating point multiplication rather than integral to cases where we can prove there will be no rounding (the multiplication will be exact, not just that the two multiplication or division operation arguments are exactly representable). 2022-11-07 Jakub Jelinek <jakub@redhat.com> PR libstdc++/107468 * src/c++17/fast_float/MERGE: Adjust for merge from upstream. * src/c++17/fast_float/LOCAL_PATCHES: Remove commits that were upstreamed. * src/c++17/fast_float/README.md: Merge from fast_float 662497742fea7055f0e0ee27e5a7ddc382c2c38e commit. * src/c++17/fast_float/fast_float.h: Likewise. * testsuite/20_util/from_chars/pr107468.cc: New test.
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