Fix some bugs (Use MPFR_ASSERT(1) instead of MPFR_ASSERT(0))

Optimize swap.c and copysign.c.


git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@2536 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 4 insertions, 4 deletions

diff --git a/ui_sub.c b/ui_sub.c
index 5a14b442e..e73fd8de5 100644
--- a/ui_sub.c
+++ b/ui_sub.c
@@ -39,19 +39,19 @@ mpfr_ui_sub (mpfr_ptr y, unsigned long int u, mpfr_srcptr x, mp_rnd_t rnd_mode)
 	  MPFR_SET_NAN(y);
 	  MPFR_RET_NAN;
 	}
-      if (MPFR_IS_INF(x))
+      else if (MPFR_IS_INF(x))
 	{
 	  /*  u - Inf = -Inf and u - -Inf = +Inf  */
 	  MPFR_SET_INF(y);
 	  MPFR_SET_OPPOSITE_SIGN(y,x);
 	  MPFR_RET(0); /* +/-infinity is exact */
 	}
-      if (MPFR_IS_ZERO(x))
+      else if (MPFR_IS_ZERO(x))
 	/* u - 0 = u */
 	return mpfr_set_ui(y, u, rnd_mode);
       /* Should never reach this code */
-      MPFR_ASSERTN(1);
-      return 0; /* To avoid a warning. It isn't reached */
+      else
+	MPFR_ASSERTN(0);
     }
   else if (u)
     {