Replaced -0.0 by a new macro DBL_NEG_ZERO. With MSVC, the negative zero

no longer depends on the non-standard _chgsign function, as
  static double double_zero = 0.0;
  # define DBL_NEG_ZERO (-double_zero)
has been reported to work.


git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@4005 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 3 insertions, 5 deletions

diff --git a/set_d.c b/set_d.c
index fec7356c0..813a1e2d2 100644
--- a/set_d.c
+++ b/set_d.c
@@ -176,11 +176,9 @@ mpfr_set_d (mpfr_ptr r, double d, mp_rnd_t rnd_mode)
            We can't use d==+0.0 since it should be always true,
            so we check that the memory representation of d is the
            same than +0.0. etc */
-#ifdef _MSC_VER
-	double poszero = +0.0, negzero = _chgsign (0.0);
-#else
-        double poszero = +0.0, negzero = -0.0;
-#endif
+        /* FIXME: consider the case where +0.0 or -0.0 may have several
+           representations. */
+        double poszero = +0.0, negzero = DBL_NEG_ZERO;
         if (memcmp(&d, &poszero, sizeof(double)) == 0)
           MPFR_SET_POS(r);
         else if (memcmp(&d, &negzero, sizeof(double)) == 0)