SUB (immediate, from PC) Subtract from PC Subtract from PC subtracts an immediate value from the Align(PC, 4) value to form a PC-relative address, and writes the result to the destination register. Arm recommends that, where possible, software avoids using this alias. ADR It has encodings from the following instruction sets: A32 ( A2 ) and T32 ( T2 ) . != 1111 0 0 1 0 0 1 0 0 1 1 1 1 SUB{<c>}{<q>} <Rd>, PC, #<const> ADR{<c>}{<q>} <Rd>, <label> imm12 == '000000000000' 1 1 1 1 0 1 0 1 0 1 0 1 1 1 1 0 SUB{<c>}{<q>} <Rd>, PC, #<imm12> ADR{<c>}{<q>} <Rd>, <label> i :: imm3 :: imm8 == '000000000000' <c> See Standard assembler syntax fields. <q> See Standard assembler syntax fields. <Rd> For the "A2" variant: is the general-purpose destination register, encoded in the "Rd" field. If the PC is used, the instruction is a branch to the address calculated by the operation. This is an interworking branch, see Pseudocode description of operations on the AArch32 general-purpose registers and the PC. <Rd> For the "T2" variant: is the general-purpose destination register, encoded in the "Rd" field. <const> An immediate value. See Modified immediate constants in A32 instructions for the range of values. <imm12> Is a 12-bit unsigned immediate, in the range 0 to 4095, encoded in the "i:imm3:imm8" field. 2026-03-12 12:23:09 2025-09_rel_asl1