RISC-V ISA Explorer · Bit Manipulation (Zb*)

Zbs: Single-Bit Ops

Ratified 2021-06 · version 1.0.0

Set, clear, invert or test a single bit at a computed index without a mask-and-shift sequence.

Typical use: Bitmap and flag manipulation

Open Zbs in the explorer

Dependencies

Required by

B

Instructions (8)

Mnemonic	Name	Encoding	Match	Mask
`BCLR`	Single-Bit clear (Register)	`0100100----------001-----0110011`	`0x48001033`	`0xfe00707f`
`BCLRI`	Single-Bit clear (Immediate)	`010010-----------001-----0010011`	`0x48001013`	`0xfc00707f`
`BEXT`	Single-Bit extract (Register)	`0100100----------101-----0110011`	`0x48005033`	`0xfe00707f`
`BEXTI`	Single-Bit extract (Immediate)	`010010-----------101-----0010011`	`0x48005013`	`0xfc00707f`
`BINV`	Single-Bit invert (Register)	`0110100----------001-----0110011`	`0x68001033`	`0xfe00707f`
`BINVI`	Single-Bit invert (Immediate)	`011010-----------001-----0010011`	`0x68001013`	`0xfc00707f`
`BSET`	Single-Bit set (Register)	`0010100----------001-----0110011`	`0x28001033`	`0xfe00707f`
`BSETI`	Single-Bit set (Immediate)	`001010-----------001-----0010011`	`0x28001013`	`0xfc00707f`