// type the selector arg on some platforms.
			return
		}
		if p, ok := t.(*types.Pointer); ok {
			// Note: we assume here that the pointer p in p.foo is properly
			// aligned. We just check that foo is at a properly aligned offset.
			t = p.Elem()
		} else {
			v.checkAddr(n.X)
		}
		if t.Underlying() == t {
			v.t.Errorf("analysis can't handle unnamed type %s %v", v.fset.Position(n.Pos()), t)
		}

	MOVD	R8, 0(R2)
	RET
notfoundr0:
	XOR	R0, R0          // reset R0
	MOVD	$-1, 0(R2)
	RET

vectorimpl:
	//if the address is not 16byte aligned, use loop for the header
	MOVD	R3, R8
	AND	$15, R8
	CMPBGT	R8, $0, notaligned

aligned:
	ADD	R6, R4, R8
	MOVD	R8, R7
	AND	$-16, R7
	// replicate c across V17
	VLVGB	$0, R5, V19
	VREPB	$0, V19, V17

vectorloop:
	CMPBGE	R3, R7, residual

/* -1 disables use of REGARG */
const (
	REGARG = -1
)

const (
	REG_R0 = obj.RBaseARM + iota // must be 16-aligned
	REG_R1
	REG_R2
	REG_R3
	REG_R4
	REG_R5
	REG_R6
	REG_R7
	REG_R8
	REG_R9
	REG_R10
	REG_R11
	REG_R12
	REG_R13
	REG_R14
	REG_R15

	REG_F0 // must be 16-aligned
	REG_F1
	REG_F2
	REG_F3
	REG_F4
	REG_F5
	REG_F6
	REG_F7
	REG_F8
	REG_F9
	REG_F10

to a specified boundary by padding with NOOP instruction. The alignment value supported on arm64
must be a power of 2 and in the range of [8, 2048].

Examples:

	PCALIGN $16
	MOVD $2, R0          // This instruction is aligned with 16 bytes.
	PCALIGN $1024
	MOVD $3, R1          // This instruction is aligned with 1024 bytes.

}

// pages64 returns a 64-bit bitmap representing a block of 64 pages aligned
// to 64 pages. The returned block of pages is the one containing the i'th
// page in this pallocBits. Each bit represents whether the page is in-use.
func (b *pallocBits) pages64(i uint) uint64 {
	return (*pageBits)(b).block64(i)
}

// allocPages64 allocates a 64-bit block of 64 pages aligned to 64 pages according

// directio.AlignSize is defined as 0 in MacOS causing divide by 0 error.
const DirectioAlignSize = 4096

// CopyAligned - copies from reader to writer using the aligned input
// buffer, it is expected that input buffer is page aligned to
// 4K page boundaries. Without passing aligned buffer may cause
// this function to return error.
//
// This code is similar in spirit to io.Copy but it is only to be

	SUBVU	R5, R4, R7
	AND	$7, R7
	BNE	R7, out

	// if less than 8 bytes, do byte copying
	SGTU	$8, R6, R7
	BNE	R7, out

	// do one byte at a time until 8-aligned
	AND	$7, R4, R8
	BEQ	R8, words
	MOVB	(R5), R7
	ADDV	$1, R5
	MOVB	R7, (R4)
	ADDV	$1, R4
	JMP	-6(PC)

words:
	// do 8 bytes at a time if there is room
	ADDV	$-7, R9, R6 // R6 is end pointer-7

	SUBVU	R2, R1, R4
	AND	$7, R4
	BNE	R4, out

	// if less than 8 bytes, do byte copying
	SGTU	$8, R3, R4
	BNE	R4, out

	// do one byte at a time until 8-aligned
	AND	$7, R1, R5
	BEQ	R5, words
	MOVB	(R2), R4
	ADDV	$1, R2
	MOVB	R4, (R1)
	ADDV	$1, R1
	JMP	-6(PC)

words:
	// do 8 bytes at a time if there is room
	ADDV	$-7, R6, R3 // R3 is end pointer-7

	// Different bytes have different bit masks (i.e: 1, 4, 16, 64)
	MOVD	$0x40100401, R5
	VMOV	R1, V0.B16
	// Work with aligned 32-byte chunks
	BIC	$0x1f, R0, R3
	VMOV	R5, V5.S4
	ANDS	$0x1f, R0, R9
	AND	$0x1f, R2, R10
	BEQ	loop

	// Input string is not 32-byte aligned. We calculate the
	// syndrome value for the aligned 32 bytes block containing
	// the first bytes and mask off the irrelevant part.
	VLD1.P	(R3), [V1.B16, V2.B16]

// Both must be aligned to pallocChunkBytes.
//
// The caller must update p.start and p.end after calling sysGrow.
func (p *pageAlloc) sysGrow(base, limit uintptr) {
	if base%pallocChunkBytes != 0 || limit%pallocChunkBytes != 0 {
		print("runtime: base = ", hex(base), ", limit = ", hex(limit), "\n")
		throw("sysGrow bounds not aligned to pallocChunkBytes")
	}