go/src/cmd/dist/util_gc.go

// useVFPv1 tries to execute one VFPv1 instruction on ARM.
// It will crash the current process if VFPv1 is missing.
func useVFPv1()

// useVFPv3 tries to execute one VFPv3 instruction on ARM.
// It will crash the current process if VFPv3 is missing.
func useVFPv3()

// useARMv6K tries to run ARMv6K instructions on ARM.
// It will crash the current process if it doesn't implement
// ARMv6K or above.
func useARMv6K()