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Instruction Formats 3–7
|| Bit concatenation
{} Indicates explicit operator precedence
(x) Contents of memory location whose address is x
x <m:n> Contents of bit field of x defined by bits n through m
x <m> M’th bit of x
ACCESS(x,y) Accessibility of the location whose address is x using the
access mode y. Returns a Boolean value TRUE if the
address is accessible, else FALSE.
AND Logical product
ARITH_RIGHT_SHIFT(x,y) Arithmetic right shift of first operand by the second oper-
and. Y is an unsigned shift value. Bit 63, the sign bit, is
copied into vacated bit positions and shifted out bits are
discarded.
BYTE_ZAP(x,y) X is a quadword, y is an 8-bit vector in which each bit
corresponds to a byte of the result. The y bit to x byte cor-
respondence is y <n> ↔ x <8n+7:8n>. This correspon-
dence also exists between y and the result.
For each bit of y from n = 0 to 7, if y <n> is 0 then byte
<n> of x is copied to byte <n> of result, and if y <n> is 1
then byte <n> of result is forced to all zeros.
Table 3–7: Operators (Continued)
Operator Meaning