rdsvl

Read Streaming Vector Length

RDSVL <Xd>, #<imm>

Reads the current vector length in streaming mode.

Pseudocode Operation

No pseudocode available.

Encoding

Binary Layout
000001001
31:23
0
22
1
21
1111
20:17
1
16
01011
15:11
imm6
10:5
Rd
4:0
 
Format SME General
Opcode 0x04BF5800
Extension SME

Operands

  • Xd
    Dest
  • imm
    Multiplier

Related

More in SME

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding Instruction ISA Bit pattern
0x04BF5800 RDSVL <Xd>, #<imm> A64 000001001 | 0 | 1 | 1111 | 1 | 01011 | imm6 | Rd

Description

Multiply the Streaming SVE vector register size in bytes by an immediate in the range -32 to 31 and place the result in the 64-bit destination general-purpose register. This instruction does not require the PE to be in Streaming SVE mode.

Operation

CheckSMEEnabled();
constant integer SVL = CurrentSVL;
integer len = imm * (SVL DIV 8);
X[d, 64] = len<63:0>;