H-Series Application Migration Guide (H06.03+)

Native C and C++ Migration Tasks

H-Series Application Migration Guide—429855-006

5-12

Pragmas

The native TNS/E C and C++ compilers support these new pragmas:

Maximum Data Alignment

Certain functions on H-series systems require that data be aligned to 16-byte

boundaries. To enable C and C++ programs to use these functions, a new pragma,

MAXALIGN, is defined. The MAXALIGN pragma specifies that objects of a composite

type are given the maximum alignment supported by the compiler. On H-series

systems, the maximum alignment is 16 bytes. MAXALIGN is required in certain cases;

for example, when allocating a register save area that will be directly used by the

hardware.

Most programs will not need to declare the MAXALIGN pragma, as it is included in the

standard header file that supplies the data type declaration.

64-Bit Data Type and String Conversion Functions

The TNS/E native C and C++ compilers provide a 64-bit unsigned integer data type.

The type declaration is unsigned long long. The following new functions are provided for

conversion between character strings and the 64-bit integer type:

Pragma Description

NEUTRAL Marks an object as sharable between VERSION2 and

VERSION3 of the C++ standard library. See Native C and

C++ Run-Time Library and Tools.h++ Migration Issues on

page 5-7 for more information.

MAXALIGN Aligns composite objects to the maximum alignment (16-

byte alignment). See Maximum Data Alignment

page 5-12 for more information.

Function Description

strtoll Converts a character string to a signed long long integer

strtoull Converts a character string to an unsigned long long integer

wcstoll Converts a wide-character string to a signed long long integer

wcstoull Converts a wide-character string to an unsigned long long integer