vcpop.v

Vector population count

Counts the number of set bits (population count) in each element of vector register vs2, storing results in vector register vd according to mask vm.

This instruction must have data-independent timing when extension Zkt is enabled.

Assembly format

vcpop.v vd, vs2, vm

Decode Variables

Bits<1> vm = $encoding[25];
Bits<5> vs2 = $encoding[24:20];
Bits<5> vd = $encoding[11:7];

Execution

Encoding

svg

Defining extension

Access

M

Always

Containing profiles

  • Mandatory: RVA20S64, RVA20U64, RVA22S64, RVA22U64, RVA23S64, RVA23U64, RVB23S64, RVB23U64

  • Optional: RVB23U64