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3–4 Alpha Architecture Handbook
3.2.1 Operand Notation
Tables 3–1, 3–2, and 3–3 list the notation for the operands, the operand values, and the other
expression operands.
Table 3–1: Operand Notation
Notation Meaning
Ra An integer register operand in the Ra field of the instruction
Rb An integer register operand in the Rb field of the instruction
#b An integer literal operand in the Rb field of the instruction
Rc An integer register operand in the Rc field of the instruction
Fa A floating-point register operand in the Ra field of the instruction
Fb A floating-point register operand in the Rb field of the instruction
Fc A floating-point register operand in the Rc field of the instruction
Table 3–2: Operand Value Notation
Notation Meaning
Rav The value of the Ra operand. This is the contents of register Ra.
Rbv The value of the Rb operand. This could be the contents of register Rb, or
a zero-extended 8-bit literal in the case of an Operate format instruction.
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.
Table 3–3: Expression Operand Notation
Notation Meaning
IPR_x Contents of Internal Processor Register x)
IPR_SP[mode] Contents of the per-mode stack pointer selected by mode
PC Updated PC value
Rn Contents of integer register n
Fn Contents of floating-point register n
X[m] Element m of array X