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  /src/external/lgpl3/mpfr/dist/src/
yn.c 219 mpfr_t l, h, t, logz; local
227 mpfr_init2 (logz, prec);
229 mpfr_log (logz, z, MPFR_RNDD); /* lower bound of log(z) */
230 mpfr_set (h, logz, MPFR_RNDU); /* exact */
233 mpfr_add (l, logz, t, MPFR_RNDD); /* lower bound of log(z) + euler */
249 /* since logz is negative, a lower bound corresponds to an upper bound
253 mpfr_mul (t, t, logz, MPFR_RNDU); /* upper bound on z^2/2*log(z) */
264 mpfr_clear (logz);

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