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

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 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.

However, following the CMPBGE instruction, the code is different that examines the byte mask to determine which string is larger, depending on whether the rightmost or leftmost unequal byte is used. Thus, compilers must be instructed to generate somewhat different code sequences for the two conventions. Implementations that include big-endian support must supply all of the following features: • A means at boot time to choose the byte numbering convention. The implementation is not required to support dynamically changing the convention during program execution.

Each operand field specifies either an integer or floating-point operand as defined by the instruction. The Fa field specifies a source operand. Symbolically, the Fav operand is formed as follows: IF inst<25:21> EQ 31 THEN Fav <- 0 ELSE Fav <— Fa END The Fb field specifies a source operand. Symbolically, the Fbv operand is formed as follows: 3-12 Common Architecture (I) I F i n s t < 2 0 : 1 6 > EQ 3 1 THEN F b v <0 ELSE F b v

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