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Microsoft Specific
3DNow! technology uses a packed data format where the data is packed in a single, 64-bit 3DNow!/MMX register or a quadword memory operand, comprising two IEEE 32-bit single-precision, floating-point doublewords.
The following figure shows the 3DNow! floating-point data type. D0 and D1 each hold an IEEE 32-bit single-precision, floating-point doubleword.
3DNow! Data Type
.gif "3DNow! data type")
The following figure shows the IEEE 32-bit single-precision, floating-point format.
Single-Precision, Floating-Point Data Format
.gif "3DNow! single-precision, floating-point")
The final figure shows the formats for the integer data types.
Integer Data Types
.gif "3DNow! integer data types")
See __m64 for more information.