米6体育平台手机版

SLAU132V October 2004 – February 2020

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6.2.1 Data Type Storage

Table 6-2 lists register and memory storage for various data types:

Table 6-2 Data Representation in Registers and Memory

Data Type	Register Storage	Memory Storage
char	Bits 0-7 of register	8 bits aligned to 8-bit boundary
unsigned char	Bits 0-7 of register	8 bits aligned to 8-bit boundary
short	Bits 0-15 of register	16 bits aligned to 16-bit boundary
unsigned short	Bits 0-15 of register	16 bits aligned to 16-bit boundary
int	Entire register	16 bits aligned to 16-bit boundary
unsigned int	Entire register	16 bits aligned to 16-bit boundary
enum ⁽¹⁾	Entire register	16 bits aligned to 16-bit boundary
float	Two registers, which need not be adjacent	32 bits aligned to 16-bit boundary
long	Two registers, which need not be adjacent	32 bits aligned to 16-bit boundary
unsigned long	Two registers, which need not be adjacent	32 bits aligned to 16-bit boundary
long long	Four registers, which need not be adjacent	64 bits aligned to 16-bit boundary
unsigned long long	Four registers, which need not be adjacent	64 bits aligned to 16-bit boundary
double	Four registers, which need not be adjacent	64 bits aligned to 16-bit boundary
long double	Four registers, which need not be adjacent	64 bits aligned to 16-bit boundary
struct	Members are stored as their individual types require.	Multiple of 8 bits aligned to boundary of largest member type; members are stored and aligned as their individual types require.
array	Members are stored as their individual types require.	Members are stored as their individual types require. All arrays inside a structure are aligned according to the type of each element in the array.
pointer to data member	Bits 0-15 of register for MSP430. Bits 0-19 of register for MSP430X.	varies, see Table 5-2
pointer to member function	Components stored as their individual types require	64 bits aligned to 32-bit boundary

(1) The size of an enum varies by the size of the largest enum value and by whether it is packed or not. For details about the size of an enum type, see Section 5.6.1.