// amd64:"POPCNTL"
	// arm64:"VCNT","VUADDLV"
	// s390x:"POPCNT"
	// ppc64x:"POPCNTW"
	// wasm:"I64Popcnt"
	return bits.OnesCount32(n)
}

func OnesCount16(n uint16) int {
	// amd64/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
	// amd64:"POPCNTL"
	// arm64:"VCNT","VUADDLV"
	// s390x:"POPCNT"
	// ppc64x:"POPCNTW"
	// wasm:"I64Popcnt"
	return bits.OnesCount16(n)

		{name: "POPCNTD", argLength: 1, reg: gp11, asm: "POPCNTD"}, // number of set bits in arg0
		{name: "POPCNTW", argLength: 1, reg: gp11, asm: "POPCNTW"}, // number of set bits in each word of arg0 placed in corresponding word
		{name: "POPCNTB", argLength: 1, reg: gp11, asm: "POPCNTB"}, // number of set bits in each byte of arg0 placed in corresponding byte

	ASRDCC
	AEXTSWSLI
	AEXTSWSLICC
	ASTDCCC
	ATD
	ASETB

	/* 64-bit pseudo operation */
	ADWORD
	AREMD
	AREMDU

	/* more 64-bit operations */
	AHRFID
	APOPCNTD
	APOPCNTW
	APOPCNTB
	ACNTTZW
	ACNTTZWCC
	ACNTTZD
	ACNTTZDCC
	ACOPY
	APASTECC
	ADARN
	AMADDHD
	AMADDHDU
	AMADDLD

	/* Vector */
	ALVEBX
	ALVEHX
	ALVEWX
	ALVX
	ALVXL

	HasOSXSAVE          bool // OS supports XSAVE/XRESTOR for saving/restoring XMM registers.
	HasPCLMULQDQ        bool // PCLMULQDQ instruction - most often used for AES-GCM
	HasPOPCNT           bool // Hamming weight instruction POPCNT.
	HasRDRAND           bool // RDRAND instruction (on-chip random number generator)
	HasRDSEED           bool // RDSEED instruction (on-chip random number generator)

	AMOVDBR

	// conditional moves
	AMOVDEQ
	AMOVDGE
	AMOVDGT
	AMOVDLE
	AMOVDLT
	AMOVDNE
	ALOCR
	ALOCGR

	// find leftmost one
	AFLOGR

	// population count
	APOPCNT

	// integer bitwise
	AAND
	AANDW
	AOR
	AORW
	AXOR
	AXORW
	ASLW
	ASLD
	ASRW
	ASRAW
	ASRD
	ASRAD
	ARLL
	ARLLG
	ARNSBG
	ARXSBG
	AROSBG
	ARNSBGT

	NEG	R1                    // b9030011
	NEG	R1, R2                // b9030021
	NEGW	R1                    // b9130011
	NEGW	R1, R2                // b9130021
	FLOGR	R2, R2                // b9830022
	POPCNT	R3, R4                // b9e10043

	AND	R1, R2                // b9800021
	AND	R1, R2, R3            // b9e42031
	AND	$-2, R1               // a517fffe
	AND	$-65536, R1           // c01bffff0000

	case APOPW, APOPL, APOPQ,
		ALEAL, ALEAQ,
		AIMUL3W, AIMUL3L, AIMUL3Q,
		APEXTRB, APEXTRW, APEXTRD, APEXTRQ, AVPEXTRB, AVPEXTRW, AVPEXTRD, AVPEXTRQ, AEXTRACTPS,
		ABSFW, ABSFL, ABSFQ, ABSRW, ABSRL, ABSRQ, APOPCNTW, APOPCNTL, APOPCNTQ, ALZCNTW, ALZCNTL, ALZCNTQ,
		ASHLXL, ASHLXQ, ASHRXL, ASHRXQ, ASARXL, ASARXQ:
		// These instructions are pure writes to To. They don't use its old value.
		m &^= readTo
	case AXORL, AXORQ: