p := runtime.NumCPU()
	runtime.GOMAXPROCS(2 * p)

	// Allocate some pointers.
	ptrs := make([]*int, p)
	for i := 0; i < p; i++ {
		ptrs[i] = new(int)
	}

	// Arena where we read and write pointers like crazy.
	collider := make([]*int, p)

	done := make(chan struct{}, 2*p)

	// Start writers.  They alternately write a pointer
	// and nil to a slot in the collider.
	for i := 0; i < p; i++ {
		i := i

		to = mallocgc(tomem, et, true)
		if copymem > 0 && writeBarrier.enabled {
			// Only shade the pointers in old.array since we know the destination slice to
			// only contains nil pointers because it has been cleared during alloc.
			//
			// It's safe to pass a type to this function as an optimization because
			// from and to only ever refer to memory representing whole values of

	// Adjust pointers in the Defer structs.
	// We need to do this first because we need to adjust the
	// defer.link fields so we always work on the new stack.
	adjustpointer(adjinfo, unsafe.Pointer(&gp._defer))
	for d := gp._defer; d != nil; d = d.link {
		adjustpointer(adjinfo, unsafe.Pointer(&d.fn))
		adjustpointer(adjinfo, unsafe.Pointer(&d.sp))
		adjustpointer(adjinfo, unsafe.Pointer(&d.link))
	}
}

const cgoResultFail = "cgo result is unpinned Go pointer or points to unpinned Go pointer"

// cgoCheckArg is the real work of cgoCheckPointer. The argument p
// is either a pointer to the value (of type t), or the value itself,
// depending on indir. The top parameter is whether we are at the top
// level, where Go pointers are allowed. Go pointers to pinned objects are

type IntegerType int

// Pointer represents a pointer to an arbitrary type. There are four special operations
// available for type Pointer that are not available for other types:
//   - A pointer value of any type can be converted to a Pointer.
//   - A Pointer can be converted to a pointer value of any type.
//   - A uintptr can be converted to a Pointer.
//   - A Pointer can be converted to a uintptr.
//

		dst = dst[done:]
		x = x[done:]
		y = y[done:]
	}
	xorLoop(dst, x, y)
}

// aligned reports whether dst, x, and y are all word-aligned pointers.
func aligned(dst, x, y *byte) bool {
	return (uintptr(unsafe.Pointer(dst))|uintptr(unsafe.Pointer(x))|uintptr(unsafe.Pointer(y)))&(wordSize-1) == 0
}

// words returns a []uintptr pointing at the same data as x,
// with any trailing partial word removed.

or a C pointer. Array and struct types may or may not include Go
pointers, depending on the element types. All the discussion below
about Go pointers applies not just to pointer types, but also to other
types that include Go pointers.

All Go pointers passed to C must point to pinned Go memory. Go pointers
passed as function arguments to C functions have the memory they point to

	type I2 interface{}
	type P1 *int
	type P2 *int
	type UP unsafe.Pointer

	type T1 struct {
		I1
		* /* ERROR "cannot be a pointer to an interface" */ I2
		* /* ERROR "cannot be a pointer to an interface" */ error
		P1 /* ERROR "cannot be a pointer" */
		* /* ERROR "cannot be a pointer" */ P2
	}

	// unsafe.Pointers are treated like regular pointers when embedded
	type T2 struct {

#include "textflag.h"

// See memmove Go doc for important implementation constraints.

// func memmove(to, from unsafe.Pointer, n uintptr)
TEXT runtime·memmove<ABIInternal>(SB), NOSPLIT|NOFRAME, $0-24
	BNE	R6, check
	RET

check:
	SGTU	R4, R5, R7
	BNE	R7, backward

	ADDV	R4, R6, R9 // end pointer

	// if the two pointers are not of same alignments, do byte copying
	SUBVU	R5, R4, R7
	AND	$7, R7
	BNE	R7, out

// func memmove(to, from unsafe.Pointer, n uintptr)
TEXT runtime·memmove(SB), NOSPLIT|NOFRAME, $0-24
	MOVV	to+0(FP), R1
	MOVV	from+8(FP), R2
	MOVV	n+16(FP), R3
	BNE	R3, check
	RET

check:
	SGTU	R1, R2, R4
	BNE	R4, backward

	ADDV	R1, R3, R6 // end pointer

	// if the two pointers are not of same alignments, do byte copying
	SUBVU	R2, R1, R4
	AND	$7, R4