Datasheet

Standard C Implementation Definition

• whether a plain

int

bitfield is treated as a

signed

int

bitfield or as an

unsigned

int

bitfield

• the order of allocation of bitfields within a unit

• whether a bitfield can straddle a storage-unit boundary

• the integer type chosen to represent the values of an enumeration type.

These implementation details are documented in the relevant sections of C and C++

implementation details on page 3-21.

Unions

See Unions on page 3-26 for details.

Enumerations

See Enumerations on page 3-26 for details.

Padding and alignment of structures

See Structures on page 3-26 for details.

Bitfields

See Bitfields on page 3-28 for details.

B.1.10 Qualifiers

An object that has a volatile-qualified type is accessed if any word or byte (or halfword

on ARM architectures that have halfword support) of it is read or written. For

volatile-qualified objects, reads and writes occur as directly implied by the source code,

in the order implied by the source code.

The effect of accessing a volatile-qualified

short

is undefined on ARM architectures

that do not have halfword support.

B.1.11 Declarators

The number of declarators that can modify an arithmetic, structure, or union type is

limited only by available memory.