r15d              145 arch/x86/entry/calling.h 	xorl	%r15d, %r15d	/* nospec r15 */
r15d               66 arch/x86/include/asm/inst.h 	.ifc \r32,%r15d
r15d              116 tools/perf/arch/x86/util/perf_regs.c 	SDT_NAME_REG(r15d, r15),