vclz.v

Vector count leading zeros

Counts the number of leading zero bits in each element of vector register vs2, storing results in vector register vd according to mask vm. For zero elements, returns the element width.

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

Assembly format

vclz.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