POPCNT

Operation

Counts set bits in the selected-width source and writes the count.

Assembler Syntax

POPCNT.{B|W|L|Q}(z) <ea>(e), Rn(d)

POPCNT.{B|W|L|Q}(z) Rn(s), Rn(d)

Privilege

Unprivileged

Repeat eligibility

REP eligible; REPcc observes dst

Counts set bits within the selected B, W, L, or Q source width and writes that count to the destination.

2.75in

Encodings

POPCNT.{B|W|L|Q}(z) <ea>(e), Rn(d)

Format: Instruction format for POPCNT.{B|W|L|Q}(z) <ea>(e), Rn(d)

2.75in POPCNT.{B|W|L|Q}(z) Rn(s), Rn(d)

Format: Instruction format for POPCNT.{B|W|L|Q}(z) Rn(s), Rn(d)