func mimetype(ext string) string {
	// amd64: `CMPB\s1\(.*\), \$104$`,-`cmpstring`
	// arm64: `MOVB\s1\(R.*\), R.*$`, `CMPW\s\$104, R.*$`, -`cmpstring`
	switch ext {
	// amd64: `CMPL\s\(.*\), \$1836345390$`
	// arm64: `MOVD\s\$1836345390`, `CMPW\sR.*, R.*$`
	case ".htm":
		return "A"
	// amd64: `CMPL\s\(.*\), \$1953457454$`
	// arm64: `MOVD\s\$1953457454`, `CMPW\sR.*, R.*$`
	case ".eot":
		return "B"

	d1[0], d1[1] = 0, 0 // arm64:"STP",-"MOVB",-"MOVH"
	d2[1], d2[0] = 0, 0 // arm64:"STP",-"MOVB",-"MOVH"
}

func loadstore(p, q *[4]uint8) {
	// amd64:"MOVL",-"MOVB"
	// arm64:"MOVWU",-"MOVBU"
	x0, x1, x2, x3 := q[0], q[1], q[2], q[3]
	// amd64:"MOVL",-"MOVB"
	// arm64:"MOVW",-"MOVB"
	p[0], p[1], p[2], p[3] = x0, x1, x2, x3
}

type S1 struct {
	a, b int16
}

func loadstore2(p, q *S1) {

// Code generated by linux/mkall.go generatePtracePair("arm", "arm64"). DO NOT EDIT.

//go:build linux && (arm || arm64)

package unix

import "unsafe"

// PtraceRegsArm is the registers used by arm binaries.
type PtraceRegsArm struct {
	Uregs [18]uint32
}

// PtraceGetRegsArm fetches the registers used by arm binaries.
func PtraceGetRegsArm(pid int, regsout *PtraceRegsArm) error {

pkg syscall (netbsd-arm64), const SYS_WAIT6 = 481
pkg syscall (netbsd-arm64), const SYS_WAIT6 ideal-int
pkg syscall (netbsd-arm64), const WEXITED = 32
pkg syscall (netbsd-arm64), const WEXITED ideal-int
pkg syscall (netbsd-arm64-cgo), const SYS_WAIT6 = 481
pkg syscall (netbsd-arm64-cgo), const SYS_WAIT6 ideal-int
pkg syscall (netbsd-arm64-cgo), const WEXITED = 32

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package arm64

import (
	"cmd/compile/internal/ssa"
	"cmd/compile/internal/ssagen"
	"cmd/internal/obj/arm64"
)

func Init(arch *ssagen.ArchInfo) {
	arch.LinkArch = &arm64.Linkarm64
	arch.REGSP = arm64.REGSP
	arch.MAXWIDTH = 1 << 50

	arch.PadFrame = padframe
	arch.ZeroRange = zerorange
	arch.Ginsnop = ginsnop

	var ret uint64

	// arm64:"RORW",-"MOVWU"
	ret += uint64(bits.RotateLeft32(t1, 7))

	// arm64:"MULW",-"MOVWU"
	ret *= uint64(t1 * t2)

	// arm64:"MNEGW",-"MOVWU"
	ret += uint64(-t1 * t3)

	// arm64:"UDIVW",-"MOVWU"
	ret += uint64(t1 / t4)

	// arm64:-"MOVWU"
	ret += uint64(t2 % t3)

	// arm64:"MSUBW",-"MOVWU"
	ret += uint64(t1 - t2*t3)

// asmcheck -gcflags=-clobberdead

//go:build amd64 || arm64

// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package codegen

type T [2]*int // contain pointer, not SSA-able (so locals are not registerized)

var p1, p2, p3 T

func F() {
	// 3735936685 is 0xdeaddead. On ARM64 R27 is REGTMP.

	// is not supported in user space on older linux kernels.
	ARM64.HasAES = isSet(HWCap, hwcap_AES)
	ARM64.HasPMULL = isSet(HWCap, hwcap_PMULL)
	ARM64.HasSHA1 = isSet(HWCap, hwcap_SHA1)
	ARM64.HasSHA2 = isSet(HWCap, hwcap_SHA2)
	ARM64.HasCRC32 = isSet(HWCap, hwcap_CRC32)
	ARM64.HasCPUID = isSet(HWCap, hwcap_CPUID)
	ARM64.HasSHA512 = isSet(HWCap, hwcap_SHA512)

	i++
}

// combined arithmetic and rotate on arm64
func checkArithmeticWithRotate(a *[1000]uint64) {
	// arm64: "AND\tR[0-9]+@>51, R[0-9]+, R[0-9]+"
	a[2] = a[1] & bits.RotateLeft64(a[0], 13)
	// arm64: "ORR\tR[0-9]+@>51, R[0-9]+, R[0-9]+"
	a[5] = a[4] | bits.RotateLeft64(a[3], 13)
	// arm64: "EOR\tR[0-9]+@>51, R[0-9]+, R[0-9]+"
	a[8] = a[7] ^ bits.RotateLeft64(a[6], 13)
	// arm64: "MVN\tR[0-9]+@>51, R[0-9]+"

	// arm64:`FMOVS\s\(R[0-9]+\)\(R[0-9]+<<2\),\sF[0-9]+`
	return b0[idx] * b1
}

func indexStore(b0 []float64, b1 float64, idx int) {
	// arm64:`FMOVD\sF[0-9]+,\s\(R[0-9]+\)\(R[0-9]+<<3\)`
	b0[idx] = b1
}

// ----------- //
//    Fused    //
// ----------- //

func FusedAdd32(x, y, z float32) float32 {
	// s390x:"FMADDS\t"
	// ppc64x:"FMADDS\t"
	// arm64:"FMADDS"
	// riscv64:"FMADDS\t"