r13d 143 arch/x86/entry/calling.h xorl %r13d, %r13d /* nospec r13 */ r13d 60 arch/x86/include/asm/inst.h .ifc \r32,%r13d r13d 110 tools/perf/arch/x86/util/perf_regs.c SDT_NAME_REG(r13d, r13),