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A general description is here.
Experimentally, several math library (‘math.h’) functions, such as ‘exp(.)’, ‘log1p()’, ‘sin()’, ‘atanh()’, when called from R, are now ensured to give fully accurate results in a small neighbourhood of special values, such as ‘exp(0) == 1’, ‘log1p(0) == 0’, etc. This makes R slightly less platform dependent for these functions, notably on platforms with less accurate system math libraries, see also <https://blog.r-project.org/2026/01/30/debugging-sensitivity-to-c-math-library-on-linux/>.