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Download v1.1 ARM Tools Reference
Transcript
Assembly Language NOP Thumb generic No operation. Instruction Replacement NOP MOV R8,R8 MOV low−to−low Thumb generic The hardware MOV instruction only supports moves between two high registers (r8−r15) or between a high register and a low register (r0−r7). The MOV pseudo−instruction supports a move between two low registers. Instruction Replacement Description MOV Rd,Rn ADD Rd,Rn,#0 If both registers are low Bcond inversion Thumb generic The PC−relative conditional branch instruction has a range of (−256,+255) bytes. The unconditional version has a range of (−2048,+2047) bytes. If the conditional branch target is out−of−range, the assembler will rewrite the conditional branch instruction with an inversed conditional branch and an unconditional branch. Instruction Replacement Bcond label Binv_cond ~1 B label Description If target label out−of−range ~1: 3−49
