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fixed: Big::Add sometimes incorrectly rounded the last bit from mantissa 

(when exp_offset == mantissa_size_in_bits ) the rounding_up was always false


git-svn-id: svn://ttmath.org/publicrep/ttmath/trunk@303 e52654a7-88a9-db11-a3e9-0013d4bc506e
This commit is contained in:
Tomasz Sowa 2010-08-18 23:31:58 +00:00
parent c65dac524a
commit 69f065245e
2 changed files with 6 additions and 6 deletions
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11
ttmath/ttmathbig.h
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@ -819,8 +819,7 @@ private:
*/
uint AddMantissas( Big<exp, man> & ss2,
bool & last_bit_set,
bool & rest_zero,
bool & rounding_up)
bool & rest_zero)
{
uint c = 0;
@ -835,8 +834,6 @@ private:
last_bit_set = mantissa.Rcr(1,1);
c += exponent.AddOne();
}
rounding_up = true;
}
else
{
@ -890,11 +887,13 @@ public:
if( ss2.IsZero() )
return 0;
last_bit_set = rest_zero = do_adding = do_rounding = rounding_up = false;
last_bit_set = rest_zero = do_adding = do_rounding = false;
rounding_up = (IsSign() == ss2.IsSign());
AddCheckExponents(ss2, exp_offset, last_bit_set, rest_zero, do_adding, do_rounding);
if( do_adding )
c += AddMantissas(ss2, last_bit_set, rest_zero, rounding_up);
c += AddMantissas(ss2, last_bit_set, rest_zero);
if( !round || !last_bit_set )
do_rounding = false;

1
ttmath/ttmathuint.h
View File

@ -1965,6 +1965,7 @@ public:
this algorithm is described in the following book:
"The art of computer programming 2" (4.3.1 page 272)
Donald E. Knuth
!! give the description here (from the book)
*/
uint Div3(const UInt<value_size> & v, UInt<value_size> * remainder = 0)
{