b

Branch (A32)

B<c> <label>

Branch relative (PC +/- 32MB).

Pseudocode Operation

if condition_satisfied then
  PC ← PC + (sign_extend(imm24) << 2) + 8

Example

B label

Encoding

Binary Layout

cond

31:28

101

27:25

0

24

imm24

23:0

 

Format Branch

Opcode 0x0A000000

Extension A32 (Base)

Operands

• label
  Label

Related

Other forms of b

• b Branch

More in A32 (Base)

Reference

View in Arm A64 ISA Reference ↗ Arm AArch32 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0x0A000000	B{<c>}{<q>} <label>		A32		cond | 101 | 0 | imm24
0xD000	B<c>{<q>} <label>		T32		1101 | cond | imm8
0xE000	B{<c>}{<q>} <label>		T32		11100 | imm11
0xF0008000	B<c>.W <label>		T32		11110 | S | cond | imm6 | 10 | J1 | 0 | J2 | imm11
0xF0009000	B{<c>}.W <label>		T32		11110 | S | imm10 | 10 | J1 | 1 | J2 | imm11

Description

Branch causes a branch to a target address.

Operation

if ConditionPassed() then
    EncodingSpecificOperations();
    BranchWritePC(PC + imm32, BranchType_DIR);