Alpha Architecture Reference Manual by Alpha Architecture Committee, Richard T. Witek

By Alpha Architecture Committee, Richard T. Witek

This can be the authoritative reference on electronic gear Corporation's new 64-bit RISC Alpha structure. Written through the designers of the interior electronic requisites, this publication comprises entire descriptions of the typical structure required for all implementations and the interfaces required to help the OSF/1 and OpenVMS working systems.

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Conditional b r a n c h e s do not affect a predicted r e t u r n a d d r e s s stack. al ÎBranch format Operation: {update PC} Ra <- PC PC <- PC + {4*SEXT(disp)> Exceptions: None Instruction mnemonics: BR Unconditional B r a n c h BSR B r a n c h to S u b r o u t i n e Qualifiers: None Description: T h e P C of t h e following instruction (the u p d a t e d PC) is w r i t t e n to register Ra, a n d t h e n t h e P C is loaded w i t h t h e t a r g e t a d d r e s s . T h e displacement is t r e a t e d a s a signed longword offset.

Fav The value of the floating point Fa operand. This is the contents of register Fa. Fbv The value of the floating point Fb operand. This is the contents of register Fb. 2 Instruction Operand Notation T h e notation used to describe instruction o p e r a n d s follows from t h e o p e r a n d specifier notation used in t h e VAX Architecture Standard. Specifies t h e instruction field (Ra, Rb, Rc, or disp) a n d register type of t h e o p e r a n d (integer or floating).

Al ÎBranch format Operation: {update PC} Ra <- PC PC <- PC + {4*SEXT(disp)> Exceptions: None Instruction mnemonics: BR Unconditional B r a n c h BSR B r a n c h to S u b r o u t i n e Qualifiers: None Description: T h e P C of t h e following instruction (the u p d a t e d PC) is w r i t t e n to register Ra, a n d t h e n t h e P C is loaded w i t h t h e t a r g e t a d d r e s s . T h e displacement is t r e a t e d a s a signed longword offset. T h i s m e a n s it is shifted left two bits (to a d d r e s s a longword boundary), sign-extended to 64 bits, a n d added to t h e u p d a t e d P C to form t h e t a r g e t v i r t u a l a d d r e s s .

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