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* real.c (mpfr_from_real): Handle Inf and NaN, and allow the rounding mode to be specified by the caller. (real_to_mpfr) Likewise. * real.h: Update mpfr_from_real, mpfr_to_real prototypes to include new arguments. * builtins.c: Update mpfr_from_real, mpfr_to_real calls. From-SVN: r124139
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