// ppc64le:`MOVWBR`
	// ppc64:`MOVW\s`
	b[1], b[2], b[3], b[4] = byte(val>>24), byte(val>>16), byte(val>>8), byte(val)
}

func store_be_byte_8(b []byte, val uint64) {
	_ = b[8]
	// arm64:`REV`,`MOVD\sR[0-9]+,\s1\(R[0-9]+\)`,-`MOVB`,-`MOVH`,-`MOVW`,-`REV16W`,-`REVW`
	// amd64/v1,amd64/v2:`MOVQ\s[A-Z]+,\s1\([A-Z]+\)`,-`MOVB`,-`MOVW`,-`MOVL`
	// amd64/v3:`MOVBEQ\s[A-Z]+,\s1\([A-Z]+\)`, -`MOVBEL`

		"pmovzxbw", "pmovzxbd", "pmovzxbq", "pmovzxwd", "pmovzxwq", "pmovzxdq",
		"pmovsxbw", "pmovsxbd", "pmovsxbq", "pmovsxwd", "pmovsxwq", "pmovsxdq",
		"pblendvb",
	},
	"fma":   {"vfmadd231sd"},
	"movbe": {"movbeqq", "movbeq", "movbell", "movbel", "movbe"},
	"lzcnt": {"lzcntq", "lzcntl", "lzcnt"},
}

// Test to use POPCNT instruction, if available
func TestPopCnt(t *testing.T) {
	for _, tt := range []struct {
		x    uint64

	"MASKMOVOU",
	"MASKMOVQ",
	"MAXPD",
	"MAXPS",
	"MAXSD",
	"MAXSS",
	"MFENCE",
	"MINPD",
	"MINPS",
	"MINSD",
	"MINSS",
	"MONITOR",
	"MOVAPD",
	"MOVAPS",
	"MOVB",
	"MOVBEL",
	"MOVBEQ",
	"MOVBEW",
	"MOVBLSX",
	"MOVBLZX",
	"MOVBQSX",
	"MOVBQZX",
	"MOVBWSX",
	"MOVBWZX",
	"MOVDDUP",
	"MOVHLPS",
	"MOVHPD",
	"MOVHPS",
	"MOVL",
	"MOVLHPS",
	"MOVLPD",

		{name: "MOVBEQloadidx8", argLength: 3, reg: gploadidx, asm: "MOVBEQ", scale: 8, aux: "SymOff", typ: "UInt64", symEffect: "Read"},                    // load and swap 8 bytes from arg0+8*arg1+auxint+aux. arg2=mem
		// indexed MOVBE stores

	MOVBEQ DX, (BX)                         // 480f38f113
	MOVBEQ R11, (BX)                        // 4c0f38f11b
	MOVBEQ DX, (R11)                        // 490f38f113
	MOVBEQ R11, (R11)                       // 4d0f38f11b
	MOVBEQ (BX), DX                         // 480f38f013
	MOVBEQ (R11), DX                        // 490f38f013
	MOVBEQ (BX), R11                        // 4c0f38f01b
	MOVBEQ (R11), R11                       // 4d0f38f01b

}

func LeadingZeros32(n uint32) int {
	// amd64/v1,amd64/v2:"BSRQ","LEAQ",-"CMOVQEQ"
	// amd64/v3: "LZCNTL",- "BSRL"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZW"
	// mips:"CLZ"
	// wasm:"I64Clz"
	// ppc64x:"CNTLZW"
	return bits.LeadingZeros32(n)
}

func LeadingZeros16(n uint16) int {
	// amd64/v1,amd64/v2:"BSRL","LEAL",-"CMOVQEQ"
	// amd64/v3: "LZCNTL",- "BSRL"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"

	ADDI:      "ADD",
	MULLI:     "MULLD",
	SRADI:     "SRAD",
	STBCXCC:   "STBCCC",
	STWCXCC:   "STWCCC",
	STDCXCC:   "STDCCC",
	LI:        "MOVD",
	LBZ:       "MOVBZ", STB: "MOVB",
	LBZU: "MOVBZU", STBU: "MOVBU",
	LHZ: "MOVHZ", LHA: "MOVH", STH: "MOVH",
	LHZU: "MOVHZU", STHU: "MOVHU",
	LWZ: "MOVWZ", LWA: "MOVW", STW: "MOVW",
	LWZU: "MOVWZU", STWU: "MOVWU",
	LD: "MOVD", STD: "MOVD",

	ALZCNTW
	AMASKMOVOU
	AMASKMOVQ
	AMAXPD
	AMAXPS
	AMAXSD
	AMAXSS
	AMFENCE
	AMINPD
	AMINPS
	AMINSD
	AMINSS
	AMONITOR
	AMOVAPD
	AMOVAPS
	AMOVB
	AMOVBEL
	AMOVBEQ
	AMOVBEW
	AMOVBLSX
	AMOVBLZX
	AMOVBQSX
	AMOVBQZX
	AMOVBWSX
	AMOVBWZX
	AMOVDDUP
	AMOVHLPS
	AMOVHPD
	AMOVHPS
	AMOVL
	AMOVLHPS
	AMOVLPD
	AMOVLPS
	AMOVLQSX

	instructions["PSLLDQ"] = x86.APSLLO
	instructions["PSRLDQ"] = x86.APSRLO
	instructions["PADDD"] = x86.APADDL
	// Spellings originally used in CL 97235.
	instructions["MOVBELL"] = x86.AMOVBEL
	instructions["MOVBEQQ"] = x86.AMOVBEQ
	instructions["MOVBEWW"] = x86.AMOVBEW

	return &Arch{
		LinkArch:       linkArch,
		Instructions:   instructions,
		Register:       register,
		RegisterPrefix: nil,

	MOVBS	0x00ffffff(R2), R1   // MOVBS 16777215(R2), R1
	MOVBS.P	0x00ffffff(R2), R1   // MOVBS.P 16777215(R2), R1
	MOVBS.W	0x00ffffff(R2), R1   // MOVBS.W 16777215(R2), R1
	MOVBS	-0x00ffffff(R2), R1  // MOVBS -16777215(R2), R1
	MOVBS.P	-0x00ffffff(R2), R1  // MOVBS.P -16777215(R2), R1
	MOVBS.W	-0x00ffffff(R2), R1  // MOVBS.W -16777215(R2), R1
	MOVBU	R1, 0x00ffffff(R2)   // MOVBU R1, 16777215(R2)