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Scalar Types

 

The latest version of this topic can be found at 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

See Also

Types and Storage