return goarch == "amd64" || goarch == "arm64"
	case "freebsd", "netbsd", "windows":
		return goarch == "amd64"
	default:
		return false
	}
}

// MSanSupported reports whether goos/goarch supports the memory
// sanitizer option.
func MSanSupported(goos, goarch string) bool {
	switch goos {
	case "linux":
		return goarch == "amd64" || goarch == "arm64" || goarch == "loong64"
	case "freebsd":
		return goarch == "amd64"

	add("go-builder", script.BoolCondition("GO_BUILDER_NAME is non-empty", testenv.Builder() != ""))
	add("link", lazyBool("testenv.HasLink()", testenv.HasLink))
	add("msan", sysCondition("-msan", platform.MSanSupported, true))
	add("mustlinkext", script.Condition("platform always requires external linking", mustLinkExt))
	add("net", script.PrefixCondition("can connect to external network host <suffix>", hasNet))

		if err != nil {
			fmt.Fprintf(os.Stderr, "could not find testing GOCACHE: %v\n%s", err, out)
			os.Exit(2)
		}
		testGOCACHE = strings.TrimSpace(string(out))

		canMSan = testenv.HasCGO() && platform.MSanSupported(runtime.GOOS, runtime.GOARCH)
		canASan = testenv.HasCGO() && platform.ASanSupported(runtime.GOOS, runtime.GOARCH)
		canRace = testenv.HasCGO() && platform.RaceDetectorSupported(runtime.GOOS, runtime.GOARCH)