HP aC++/HP C A.06.25 Programmer's Guide

The -fpeval option specifies the minimum precision to use for floating-point

expression evaluation. This option does not affect the precision of parameters, return

types, or assignments.

The defined values for precision are:

float

Evaluates floating-point expressions and constants in their semantic type.

double Evaluates float operations and constants using the range and precision

of double, and evaluates all other floating-point expressions and

constants in their semantic type.

extended

Utilizes hardware support of these floating-point registers for optimum

speed in floating-point computations. Evaluates float and double

constants and expressions using the range and precision of the extended

type, and evaluates all other floating-point expressions in their semantic

type. Though this option provides greater precision than double, it does

not provide greater speed than double or float.

The default is -fpeval=float.

-fpevaldec

-fpevaldec=precision

The -fpevaldec option specifies the minimum precision to use for decimal

floating-point expression evaluation. The possible values for precision are

_Decimal32, _Decimal64, and _Decimal128. This option does not affect the

precision of parameters, return types, or assignments.

The default is -fpevaldec=_Decimal32.

-[no]fpwidetypes

The -[no]fpwidetypes option enables [disables] extended and quad floating-point

data types. quad is equivalent to long double. This option also enables __float80

prototypes. The compiler defines _FPWIDETYPES when -fpwidetypes is in effect.

The default is -nofpwidetypes.

+decfp

The +decfp option enables full decimal floating-point functionality according to the

ISO/IEC C draft Technical Report (http://www.open-std.org/jtc1/sc22/wg14/

www/docs/n1312.pdf )

Decimal floating-point is also supported in C++ compilation mode.

For more information on using Decimal FP, see the HP aC++/HP ANSI C Release Notes

section "Decimal floating-point arithmetic supported" under "New Features in the

A.06.20 Release."

54 Command-Line Options