"ringed_planet":                        "\U0001fa90",
	"robot":                                "\U0001f916",
	"rock":                                 "\U0001faa8",
	"rocket":                               "\U0001f680",
	"rofl":                                 "\U0001f923",
	"roll_eyes":                            "\U0001f644",
	"roll_of_paper":                        "\U0001f9fb",
	"roller_coaster":                       "\U0001f3a2",

	var a uint32

	// amd64:"ROLL\t[$]7"
	// arm:"MOVW\tR\\d+@>25"
	// ppc64x:"ROTLW\t[$]7"
	// loong64: "ROTR\t[$]25"
	// riscv64: "RORIW\t[$]25"
	a += x<<7 | x>>25

	// amd64:`ROLL\t[$]8`
	// arm:"MOVW\tR\\d+@>24"
	// arm64:"RORW\t[$]24"
	// s390x:"RLL\t[$]8"
	// ppc64x:"ROTLW\t[$]8"
	// loong64: "ROTR\t[$]24"
	// riscv64: "RORIW\t[$]24"
	a += x<<8 + x>>24

	// amd64:"ROLL\t[$]9"
	// arm:"MOVW\tR\\d+@>23"

	// ppc64x/power9:"MADDLD","ROTL\t[$]63"
	even := n%6 == 0

	// amd64:"IMULQ","ADD",-"ROLQ",-"DIVQ"
	// 386:"IMUL3L\t[$]678152731","ADDL\t[$]113025455",-"ROLL",-"DIVQ"
	// arm64:"MUL","MOVD\t[$]485440633518672410","ADD",-"ROR",-"DIV"
	// arm:"MUL","ADD\t[$]113025455",-".*udiv"
	// ppc64x/power8:"MULLD","ADD",-"ROTL"
	// ppc64x/power9:"MADDLD",-"ROTL"
	odd := n%19 == 0

	return even, odd
}

// --------------------- //

func RotateLeft64(n uint64) uint64 {
	// amd64:"ROLQ"
	// arm64:"ROR"
	// ppc64x:"ROTL"
	// s390x:"RISBGZ\t[$]0, [$]63, [$]37, "
	// wasm:"I64Rotl"
	return bits.RotateLeft64(n, 37)
}

func RotateLeft32(n uint32) uint32 {
	// amd64:"ROLL" 386:"ROLL"
	// arm:`MOVW\tR[0-9]+@>23`
	// arm64:"RORW"
	// ppc64x:"ROTLW"
	// s390x:"RLL"
	// wasm:"I32Rotl"

func (s *LSym) WriteCURelativeAddr(ctxt *Link, off int64, rsym *LSym, roff int64) {
	s.writeAddr(ctxt, off, ctxt.Arch.PtrSize, rsym, roff, objabi.R_ADDRCUOFF)
}

// WriteOff writes a 4 byte offset to rsym+roff into s at offset off.
// After linking the 4 bytes stored at s+off will be
// rsym+roff-(start of section that s is in).
func (s *LSym) WriteOff(ctxt *Link, off int64, rsym *LSym, roff int64) {
	s.prepwrite(ctxt, off, 4)
	r := Addrel(s)

#define MSGSCHEDULE1(index) \
	MOVL	((index-2)*4)(BP), AX; \
	MOVL	AX, CX; \
	RORL	$17, AX; \
	MOVL	CX, DX; \
	RORL	$19, CX; \
	SHRL	$10, DX; \
	MOVL	((index-15)*4)(BP), BX; \
	XORL	CX, AX; \
	MOVL	BX, CX; \
	XORL	DX, AX; \
	RORL	$7, BX; \
	MOVL	CX, DX; \
	SHRL	$3, DX; \
	RORL	$18, CX; \
	ADDL	((index-7)*4)(BP), AX; \
	XORL	CX, BX; \
	XORL	DX, BX; \
	ADDL	((index-16)*4)(BP), BX; \

#define MSGSCHEDULE1(index) \
	MOVL	((index-2)*4)(BP), AX; \
	MOVL	AX, CX; \
	RORL	$17, AX; \
	MOVL	CX, DX; \
	RORL	$19, CX; \
	SHRL	$10, DX; \
	MOVL	((index-15)*4)(BP), BX; \
	XORL	CX, AX; \
	MOVL	BX, CX; \
	XORL	DX, AX; \
	RORL	$7, BX; \
	MOVL	CX, DX; \
	SHRL	$3, DX; \
	RORL	$18, CX; \
	ADDL	((index-7)*4)(BP), AX; \
	XORL	CX, BX; \
	XORL	DX, BX; \
	ADDL	((index-16)*4)(BP), BX; \

	XORL	b,		R9; \
	ADDL	$const,	a; \
	ADDL	R8,		a; \
	MOVL	(index*4)(SI),R8; \
	ADDL	R9,		a; \
	ROLL	$shift,		a; \
	ADDL	b,		a

#define ROUND3(a, b, c, d, index, const, shift) \
	XORL	a,		R9; \
	XORL	b,		R9; \
	ADDL	$const,	a; \
	ADDL	R8,		a; \
	MOVL	(index*4)(SI),R8; \
	ADDL	R9,		a; \
	ROLL	$shift,		a; \
	ADDL	b,		a

	ROUND3FIRST(AX,BX,CX,DX, 8,0xfffa3942, 4);

// license that can be found in the LICENSE file.

package unix

import (
	"syscall"
	"unsafe"
)

func CopyFileRange(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) {
	r1, _, errno := syscall.Syscall6(copyFileRangeTrap,
		uintptr(rfd),
		uintptr(unsafe.Pointer(roff)),
		uintptr(wfd),
		uintptr(unsafe.Pointer(woff)),
		uintptr(len),
		uintptr(flags),
	)
	n = int(r1)
	if errno != 0 {

	v   uint64
}

func newB(pid int) *B {
	return &B{
		pid: pid,
	}
}

//go:noinline
func Sq(i int) uint64 {
	S++
	return uint64(i * i)
}

type RO func(*B)

var ROSL = []RO{
	Bad(),
}

func Bad() RO {
	return func(b *B) {
		b.f = func() (uint64, error) {
			return Sq(b.pid), nil
		}
	}
}

func (b *B) startit() chan<- struct{} {
	stop := make(chan struct{})