EXTRACT

Operation

Extracts a selected-width value from a concatenated pair of Rn registers.

Assembler Syntax

EXTRACT.{B|W|L|Q}(z) imm7(i), Rn(h), Rn(l)

Privilege

Unprivileged

Repeat eligibility

REP eligible; REPcc observes low_dst

Concatenates Rn(high) as the upper half and the original Rn(low/dest) value as the lower half, shifts the concatenated value right by an unsigned 7-bit immediate offset, and writes the low selected-size result back to Rn(low/dest).

Let \(n\) be the selected operand width and form the \(2n\)-bit concatenation $\(T = \operatorname{concat}\bigl(Rn(\mathrm{high})[n-1:0], Rn(\mathrm{low})[n-1:0]\bigr).\)$ The immediate is an unsigned seven-bit shift count. The destination receives the low \(n\) bits of \(T\) after a logical right shift by that count. A count greater than or equal to \(2n\) produces zero. The high register is not changed.

2.75in

Encodings

EXTRACT.{B|W|L|Q}(z) imm7(i), Rn(h), Rn(l)

Format: Instruction format for EXTRACT.{B|W|L|Q}(z) imm7(i), Rn(h), Rn(l)