func lshMask32x64(v int32, s uint64) int32 {
	// arm64:"LSL",-"AND"
	// ppc64x:"ISEL",-"ORN"
	// riscv64:"SLL",-"AND\t",-"SLTIU"
	// s390x:-"RISBGZ",-"AND",-"LOCGR"
	return v << (s & 63)
}

func rshMask32Ux64(v uint32, s uint64) uint32 {
	// arm64:"LSR",-"AND"
	// ppc64x:"ISEL",-"ORN"
	// riscv64:"SRLW","SLTIU","NEG","AND\t",-"SRL\t"
	// s390x:-"RISBGZ",-"AND",-"LOCGR"
	return v >> (s & 63)
}