VCPOP.M

Vector Mask Population Count

VCPOP.M rd, vs2, vm

Counts set bits in the source mask register.

Encoding

Binary Layout

010000

31:26

vm

25

vs2

24:20

10000010

19:12

rd

11:7

1010111

6:0

 

Format OPMVX

Opcode 0x40082057

Extension V

Operands

• rd
  Dest (Scalar)
• vs2
  Src Mask

Example

VCPOP.M t0, v4, v0.t

Related

More in V

Reference

View in RISC-V Unprivileged ISA Specification ↗ RISC-V ISA Manual

Description

Counts the number of set bits in mask register vs2 that are active (within vl), writing the count to scalar rd.

Operation

rd = count_set_bits(vs2 & vm);