X86_FEATURE_POPCNT 19 arch/x86/include/asm/arch_hweight.h asm (ALTERNATIVE("call __sw_hweight32", "popcntl %1, %0", X86_FEATURE_POPCNT) X86_FEATURE_POPCNT 47 arch/x86/include/asm/arch_hweight.h asm (ALTERNATIVE("call __sw_hweight64", "popcntq %1, %0", X86_FEATURE_POPCNT) X86_FEATURE_POPCNT 101 tools/objtool/special.c if (feature == X86_FEATURE_POPCNT)