Export (0) Print
Expand All

Scalar Types 

Although the access of data can stem from any alignment, it is recommended that data be aligned on its natural boundary to avoid performance loss (or a multiple thereof). Enums are constant integers and are treated as 32-bit integers. The following table describes the type definition and recommended storage for it as it pertains to alignment using the following alignment values:

  • Byte – 8 bits

  • Word – 16 bits

  • Double Word – 32 bits

  • Quad Word – 64 bits

  • Octa Word – 128 bits

Scalar Type

C Data Type

Storage Size (in bytes)

Recommended Alignment

INT8

char

1

Byte

UINT8

unsigned char

1

Byte

INT16

short

2

Word

UINT16

unsigned short

2

Word

INT32

int, long

4

Doubleword

UINT32

unsigned int, unsigned long

4

Doubleword

INT64

__int64

8

Quadword

UINT64

unsigned __int64

8

Quadword

FP32 (single precision)

float

4

Doubleword

FP64 (double precision)

double

8

Quadword

POINTER

*

8

Quadword

__m64

struct __m64

8

Quadword

__m128

struct __m128

16

Octaword

Community Additions

ADD
Show:
© 2014 Microsoft