BEXTI

Bit Extract Immediate

BEXTI rd, rs1, imm

Extracts the value of a single bit (0 or 1) at the index specified by an immediate.

Encoding

Binary Layout

010010

31:26

shamtd

25:20

rs1

19:15

101

14:12

rd

11:7

0010011

6:0

 

Format I-Type

Opcode 0x48005013

Extension Zbs

Operands

• rd
  Dest (0 or 1)
• rs1
  Source
• imm
  Index

Example

BEXTI x10, x11, 31

// Get sign bit (bit 31) of x11.

Related

More in Zbs

Reference

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

Description

BEXTI extracts the single bit of rs1 selected by the immediate, zero-extending to XLEN and writing to rd.

Operation

R[rd] = (R[rs1] >> imm) & 1;