PERF_REG_X86_DX
(1ULL << PERF_REG_X86_DX) | \
PT_REGS_OFFSET(PERF_REG_X86_DX, dx),
id = PERF_REG_X86_DX;
id = PERF_REG_X86_DX;
[PERF_REG_X86_DX] = 2,
[PERF_REG_X86_DX] = 1,
[PERF_REG_X86_DX] = 5,
case PERF_REG_X86_DX: