diff options
Diffstat (limited to 'src/add.c')
| -rw-r--r-- | src/add.c | 20 |
1 files changed, 16 insertions, 4 deletions
@@ -31,7 +31,7 @@ mpfr_add (mpfr_ptr a, mpfr_srcptr b, mpfr_srcptr c, mpfr_rnd_t rnd_mode) mpfr_get_prec (c), mpfr_log_prec, c, rnd_mode), ("a[%Pu]=%.*Rg", mpfr_get_prec (a), mpfr_log_prec, a)); - if (MPFR_ARE_SINGULAR(b,c)) + if (MPFR_ARE_SINGULAR_OR_UBF (b, c)) { if (MPFR_IS_NAN(b) || MPFR_IS_NAN(c)) { @@ -59,7 +59,7 @@ mpfr_add (mpfr_ptr a, mpfr_srcptr b, mpfr_srcptr c, mpfr_rnd_t rnd_mode) MPFR_SET_SAME_SIGN(a, c); MPFR_RET(0); /* exact */ } - /* now either b or c is zero */ + /* now both b and c are finite numbers */ else if (MPFR_IS_ZERO(b)) { if (MPFR_IS_ZERO(c)) @@ -78,11 +78,23 @@ mpfr_add (mpfr_ptr a, mpfr_srcptr b, mpfr_srcptr c, mpfr_rnd_t rnd_mode) } return mpfr_set (a, c, rnd_mode); } - else + else if (MPFR_IS_ZERO(c)) { - MPFR_ASSERTD(MPFR_IS_ZERO(c)); return mpfr_set (a, b, rnd_mode); } + else + { + MPFR_ASSERTD (MPFR_IS_PURE_UBF (b)); + MPFR_ASSERTD (MPFR_IS_PURE_UBF (c)); + /* mpfr_sub1sp and mpfr_add1sp are not intended to support UBF, + for which optimization is less important. */ + if (MPFR_SIGN(b) != MPFR_SIGN(c)) + return mpfr_sub1 (a, b, c, rnd_mode); + else if (MPFR_EXP_LESS_P (b, c)) + return mpfr_add1 (a, c, b, rnd_mode); + else + return mpfr_add1 (a, b, c, rnd_mode); + } } MPFR_ASSERTD (MPFR_IS_PURE_FP (b)); |