HP aC++/HP C Programmer's Guide (B3901-90036; A.06.26; September 2011)

inter-process communication. In addition, misaligned data addresses can cause bus
errors when an attempt is made to dereference the address.
For information on unaligned data access, See “Handling Unaligned Data” (page 122).
Table 3 lists the size and alignment of the HP compiler data types:
Table 3 Size and Alignment of HP Compiler Data Types
AlignmentSize (in bytes)Data Type
1-byte1bool
11char, unsigned char, signed
char
44wchar_t
22short, unsigned short,
signed short
44int, unsigned int
4*4*long, unsigned long
44float
1616__float80
8**16__float128
44_Decimal32
88_Decimal64
1616_Decimal128
88double
8**16long double
88long long, unsigned long
long
44enum
Alignment of array element typeSize of array element typearrays
1-, 2-, 4-, 8-, or 16-byte***struct
1-, 2-, 4-, 8-, or 16-byte***union
Alignment of declared typeSize of declared typebit-fields
4*4*pointer
* In 64-bit mode, long, unsigned long, and pointer data types are 8 bytes long and 8-byte aligned.
** In 64-bit mode, long double is 16-byte aligned.
38 Command-Line Options