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This commit is contained in:
Andreas Fabri 2012-08-30 15:35:14 +00:00
parent e12560afff
commit c149dacd78
1 changed files with 9 additions and 4 deletions
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13
Number_types/doc/Number_types/CGAL/FPU.h
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@ -4,6 +4,8 @@ namespace CGAL {
/*!
\ingroup nt_util
\brief The class `Protect_FPU_rounding` allows to reduce the number of rounding mode changes when evaluating sequences of interval arithmetic operations.
\anchor protect_fpu_rouding
Floating-point arithmetic, as specified by the IEEE-754 standard, allows to use
@ -92,6 +94,12 @@ namespace CGAL {
/*!
\ingroup nt_util
\brief The class `Set_ieee_double_precision` provides a mechanism to set
the correct 53 bits precision for a block of code. It does so by having
a default constructor that sets a particular mode on the FPU which corrects
the problem, and have its destructor reset the mode to its previous state.
\details
\anchor set_ieee_double_precision
The IEEE754 standard specifies that the precision of double precision
@ -109,10 +117,7 @@ variables are kept in registers), for example numerical floating-point
values get computed with slightly different results. Finally, it affects code
that carefully makes use of cancellation properties, like `Residue`.
The class `Set_ieee_double_precision` provides a mechanism to set
the correct 53 bits precision for a block of code. It does so by having
a default constructor that sets a particular mode on the FPU which corrects
the problem, and have its destructor reset the mode to its previous state.
If the platform is not affected by the excess precision problem, this class becomes an empty class doing nothing.