By Alpha Architecture Committee, Richard T. Witek
This is often the authoritative reference on electronic apparatus Corporation's new 64-bit RISC Alpha structure. Written by way of the designers of the inner electronic standards, this ebook comprises entire descriptions of the typical structure required for all implementations and the interfaces required to aid the OSF/1 and OpenVMS working systems.
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They a r e ignored by S_floating store. They a r e also ignored in o p e r a n d s of a longword integer operate instruction, a n d t h e y a r e set to 000 in t h e r e s u l t of a longword o p e r a t e instruction. T h e register format bit <62>, " P , in F i g u r e 2 - 1 6 is p a r t of t h e I n t e g e r Hi field in F i g u r e 2 - 1 5 a n d r e p r e s e n t s t h e high-order bit of t h a t field. Bits <58:45> of F i g u r e 2 - 1 6 a r e t h e r e m a i n i n g bits of t h e I n t e g e r Hi field of F i g u r e 2 - 1 5 .
T h e displacement field is a byte offset. It is sign-extended a n d added to t h e contents of register Rb to form a v i r t u a l a d d r e s s . Overflow is ignored in t h i s calculation. T h e v i r t u a l a d d r e s s is used a s a m e m o r y load/store a d d r e s s or a r e s u l t value, d e p e n d i n g on t h e specific instruction. 1 Memory Format Instructions with a Function Code Memory format instructions w i t h a function code replace t h e m e m o r y displacement field in t h e m e m o r y instruction format w i t h a function code t h a t d e s i g n a t e s a set of miscellaneous instructions.
T h e register format bit <62>, " P , in F i g u r e 2 - 1 6 is p a r t of t h e I n t e g e r Hi field in F i g u r e 2 - 1 5 a n d r e p r e s e n t s t h e high-order bit of t h a t field. Bits <58:45> of F i g u r e 2 - 1 6 a r e t h e r e m a i n i n g bits of t h e I n t e g e r Hi field of F i g u r e 2 - 1 5 . Basic Architecture (I) 2-11 NOTE Alpha i m p l e m e n t a t i o n s will impose a significant performance penalty w h e n accessing longwords t h a t a r e not n a t u r a l l y aligned.
Alpha Architecture Reference Manual by Alpha Architecture Committee, Richard T. Witek