Alpha AXP Architecture Reference Manual by Richard L. Sites, Richard T. Witek

By Richard L. Sites, Richard T. Witek

Alpha AXP structure Reference handbook

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Note: Alpha AXP implementations will impose a significant performance penalty when accessing T_floating operands that are not naturally aligned. 3 X_Floating Support for 128-bit IEEE extended-precision (X_float) floating-point is initially provided entirely through software. This section is included to preserve the intended consistency of implementation with other IEEE floating-point data types, should the X_float data type be supported in future hardware. An IEEE extended-precision, or X_floating, datum occupies 16 contiguous bytes in memory, starting on an arbitrary byte boundary.

Note: Alpha AXP implementations will impose a significant performance penalty when accessing X_floating operands that are not naturally aligned. 3 describes Alpha AXP support for big-endian data types. It is intended that software or hardware implementation for a big-endian X_float data type comply with that support and have the following formats. Figure 2-17: X_Floating Big-Endian Datum Byte 0 A: S Exponent Fraction_high Byte 15 A+8: Fractionjow Basic Architecture (I) 2-11 Figure 2-18: X_Floating Big-Endian Register Format Byte Byte 0 S \ ç.

3. F). 4. F). 5. If E = 0 and F = 0, then V = (-1)**S x 0 (zero). Note: Alpha AXP implementations will impose a significant performance penalty when accessing X_floating operands that are not naturally aligned. 3 describes Alpha AXP support for big-endian data types. It is intended that software or hardware implementation for a big-endian X_float data type comply with that support and have the following formats. Figure 2-17: X_Floating Big-Endian Datum Byte 0 A: S Exponent Fraction_high Byte 15 A+8: Fractionjow Basic Architecture (I) 2-11 Figure 2-18: X_Floating Big-Endian Register Format Byte Byte 0 S \ ç.

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