VSETVL

Vector Set VL

VSETVL rd, rs1, rs2

Sets the vector length (VL) based on the application vector length (AVL) in rs1 and configuration in rs2.

Encoding

Binary Layout

1000000

31:25

rs2

24:20

rs1

19:15

111

14:12

rd

11:7

1010111

6:0

 

Format V-Type

Opcode 0x80007057

Extension V

Operands

• rd
  Dest (New VL)
• rs1
  AVL
• rs2
  Config (VTYPE)

Example

VSETVL t0, a0, a1

Related

More in V

Reference

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

Description

Sets the vector length (vl) and vector type (vtype) registers based on the requested application vector length (AVL) and element width/grouping. The actual vector length set is written to rd. vtype encodes SEW (element width), LMUL (register grouping), and tail/mask policies.

Operation

vl = set_config(rs1, rs2); R[rd] = vl;