ci := (sy-src.Rect.Min.Y)*src.CStride + (sp.X - src.Rect.Min.X)
		for x := x0; x != x1; x, yi, ci = x+4, yi+1, ci+1 {
	`,
	"422": `
		ciBase := (sy-src.Rect.Min.Y)*src.CStride - src.Rect.Min.X/2
		for x, sx := x0, sp.X; x != x1; x, sx, yi = x+4, sx+1, yi+1 {
			ci := ciBase + sx/2
	`,
	"420": `
		ciBase := (sy/2-src.Rect.Min.Y/2)*src.CStride - src.Rect.Min.X/2
		for x, sx := x0, sp.X; x != x1; x, sx, yi = x+4, sx+1, yi+1 {

	r11  uint32 /* ... */
	r12  uint32 /* ... */
	sp   uint32
	link uint32 /* ... */
	trap uint32 /* trap type */
	psr  uint32
	pc   uint32 /* interrupted addr */
}

type sigctxt struct {
	u *ureg
}

//go:nosplit
//go:nowritebarrierrec
func (c *sigctxt) pc() uintptr { return uintptr(c.u.pc) }

func (c *sigctxt) sp() uintptr { return uintptr(c.u.sp) }
func (c *sigctxt) lr() uintptr { return uintptr(c.u.link) }

	y1 := r.Max.Y - dst.Rect.Min.Y
	switch src.SubsampleRatio {

	case image.YCbCrSubsampleRatio444:
		for y, sy := y0, sp.Y; y != y1; y, sy = y+1, sy+1 {
			dpix := dst.Pix[y*dst.Stride:]
			yi := (sy-src.Rect.Min.Y)*src.YStride + (sp.X - src.Rect.Min.X)

			ci := (sy-src.Rect.Min.Y)*src.CStride + (sp.X - src.Rect.Min.X)
			for x := x0; x != x1; x, yi, ci = x+4, yi+1, ci+1 {

	MOVQ	(9*8)(DI), R12	// a9
	MOVQ	(10*8)(DI), R13	// a10
	MOVQ	R10, (0*8)(SP)	// a7
	MOVQ	R11, (1*8)(SP)	// a8
	MOVQ	R12, (2*8)(SP)	// a9
	MOVQ	R13, (3*8)(SP)	// a10
	MOVQ	(0*8)(DI), R11	// fn
	MOVQ	(2*8)(DI), SI	// a2
	MOVQ	(3*8)(DI), DX	// a3
	MOVQ	(4*8)(DI), CX	// a4
	MOVQ	(5*8)(DI), R8	// a5
	MOVQ	(6*8)(DI), R9	// a6
	MOVQ	DI, (4*8)(SP)
	MOVQ	(1*8)(DI), DI	// a1
	XORL	AX, AX	     	// vararg: say "no float args"

	VPERMB 17(SP)(BP*1), Y31, K7, Y22                  // 62e205278db42c11000000
	VPERMB -7(CX)(DX*8), Y31, K7, Y22                  // 62e205278db4d1f9ffffff
	VPERMB Y5, Y5, K7, Y22                             // 62e2552f8df5
	VPERMB Y19, Y5, K7, Y22                            // 62a2552f8df3
	VPERMB Y31, Y5, K7, Y22                            // 6282552f8df7

	# Get the goroutine's saved state.
	pc, sp = ptr['sched']['pc'], ptr['sched']['sp']
	status = ptr['atomicstatus']['value']&~G_SCAN
	# Goroutine is not running nor in syscall, so use the info in goroutine
	if status != G_RUNNING and status != G_SYSCALL:
		return pc.cast(vp), sp.cast(vp)

	# If the goroutine is in a syscall, use syscallpc/sp.
	pc, sp = ptr['syscallpc'], ptr['syscallsp']
	if sp != 0:
		return pc.cast(vp), sp.cast(vp)

	VPDPBUSDS 17(SP)(BP*8), Z16, K2, Z21               // 62e27d4251acec11000000
	VPDPBUSDS 17(SP)(BP*4), Z16, K2, Z21               // 62e27d4251acac11000000
	VPDPBUSDS Z12, Z13, K2, Z21                        // 62c2154a51ec
	VPDPBUSDS Z27, Z13, K2, Z21                        // 6282154a51eb
	VPDPBUSDS 17(SP)(BP*8), Z13, K2, Z21               // 62e2154a51acec11000000

// func runtime·doasanread(addr unsafe.Pointer, sz, sp, pc uintptr)
TEXT	runtime·doasanread(SB), NOSPLIT, $0-32
	MOV	addr+0(FP), X10
	MOV	sz+8(FP), X11
	MOV	sp+16(FP), X12
	MOV	pc+24(FP), X13
	// void __asan_read_go(void *addr, uintptr_t sz);
	MOV	$__asan_read_go(SB), X14
	JMP	asancall<>(SB)

// func runtime·doasanwrite(addr unsafe.Pointer, sz, sp, pc uintptr)
TEXT	runtime·doasanwrite(SB), NOSPLIT, $0-32

// run

package main

var sp = ""

func f(name string, _ ...interface{}) int {
	print(sp, name)
	sp = " "
	return 0
}

var a = f("a", x)
var b = f("b", y)
var c = f("c", z)
var d = func() int {
	if false {
		_ = z
	}
	return f("d")
}()
var e = f("e")

var x int
var y int = 42
var z int = func() int { return 42 }()

	case -AMOVWR:
		return SP(4, 6)
	case -AMOVVL:
		return SP(3, 2)
	case -AMOVVR:
		return SP(3, 3)
	case -AMOVB:
		return SP(4, 0)
	case -AMOVBU:
		return SP(4, 4)
	case -AMOVH:
		return SP(4, 1)
	case -AMOVHU:
		return SP(4, 5)
	case -AMOVW:
		return SP(4, 3)
	case -AMOVWU:
		return SP(4, 7)
	case -AMOVV:
		return SP(6, 7)
	case -AMOVF: