VMSOF.M

Vector Mask Set Only First

VMSOF.M vd, vs2, vm

Sets only the first set bit from the source mask.

Encoding

Binary Layout

010100

31:26

vm

25

vs2

24:20

00010010

19:12

vd

11:7

1010111

6:0

 

Format OPMVV

Opcode 0x50012057

Extension V

Operands

• vd
  Dest Mask
• vs2
  Src Mask

Example

VMSOF.M v1, v4, v0.t

Related

More in V

Reference

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

Description

Sets only the destination mask bit corresponding to the first active set bit in vs2.

Operation

vd = (1 << first_set_index(vs2)) & vm;