Macros MPFR_EXP_INVALID (invalid exponent value) and MPFR_EXP_CHECK

added. Code update to use MPFR_GET_EXP and MPFR_SET_EXP instead of
MPFR_EXP to allow more bug detection related to special values.
Macros MPFR_SET_NAN, MPFR_SET_INF, MPFR_SET_ZERO and MPFR_INIT set
the exponent of the number to MPFR_EXP_INVALID if MPFR_EXP_CHECK
is defined. Compile with -DMPFR_EXP_CHECK and make check to see
the potential problems; currently, 40 of 76 tests fail.


git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@2301 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 6 insertions, 6 deletions

diff --git a/mul_2si.c b/mul_2si.c
index ad0b29f27..b3d4e3645 100644
--- a/mul_2si.c
+++ b/mul_2si.c
@@ -1,6 +1,6 @@
 /* mpfr_mul_2si -- multiply a floating-point number by a power of two
 
-Copyright 1999, 2001, 2002 Free Software Foundation, Inc.
+Copyright 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
 
 This file is part of the MPFR Library.
 
@@ -33,22 +33,22 @@ mpfr_mul_2si (mpfr_ptr y, mpfr_srcptr x, long int n, mp_rnd_t rnd_mode)
 
   if (MPFR_IS_FP(y) && MPFR_NOTZERO(y))
     {
+      mp_exp_t exp = MPFR_GET_EXP (y);
       if (n > 0 && (__gmpfr_emax < MPFR_EMIN_MIN + n ||
-                    MPFR_EXP(y) > __gmpfr_emax - n))
+                    exp > __gmpfr_emax - n))
         return mpfr_set_overflow (y, rnd_mode, MPFR_SIGN(y));
 
       if (n < 0 && (__gmpfr_emin > MPFR_EMAX_MAX + n ||
-                    MPFR_EXP(y) < __gmpfr_emin - n))
+                    exp < __gmpfr_emin - n))
         {
           if (rnd_mode == GMP_RNDN &&
               (__gmpfr_emin > MPFR_EMAX_MAX + (n + 1) ||
-               MPFR_EXP(y) < __gmpfr_emin - (n + 1) ||
-               mpfr_powerof2_raw (y)))
+               exp < __gmpfr_emin - (n + 1) || mpfr_powerof2_raw (y)))
             rnd_mode = GMP_RNDZ;
           return mpfr_set_underflow (y, rnd_mode, MPFR_SIGN(y));
         }
 
-      MPFR_EXP(y) += n;
+      MPFR_SET_EXP (y, exp + n);
     }
 
   return inexact;