PERF_REG_ARM64_PC
if ((u32)idx == PERF_REG_ARM64_PC)
if (!(regs->mask & SMPL_REG_MASK(PERF_REG_ARM64_PC))) {
regs->cache_mask |= SMPL_REG_MASK(PERF_REG_ARM64_PC);
regs->cache_regs[PERF_REG_ARM64_PC] = sample->callchain->ips[usr_idx+1];
case PERF_REG_ARM64_PC:
return PERF_REG_ARM64_PC;