for _, key := range keys {
		m[key] = true
	}
	return m
}

var runtimeFeatures = setOf(
	"adx", "aes", "avx", "avx2", "bmi1", "bmi2", "erms", "fma",
	"pclmulqdq", "popcnt", "rdtscp", "sse3", "sse41", "sse42", "ssse3",
)

var featureToOpcodes = map[string][]string{
	// Note: we include *q, *l, and plain opcodes here.
	// go tool objdump doesn't include a [QL] on popcnt instructions, until CL 351889

	cpu.extension=off disables use of instructions from the specified instruction set extension.
	extension is the lower case name for the instruction set extension such as sse41 or avx
	as listed in internal/cpu package. As an example cpu.avx=off disables runtime detection
	and thereby use of AVX instructions.

	cgocheck: setting cgocheck=0 disables all checks for packages