// in internal/bytealg/equal_*.s
//
// memequal should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - github.com/bytedance/sonic
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname memequal
//go:noescape
func memequal(a, b unsafe.Pointer, size uintptr) bool

			// we must have lost the race, and therefore n is not nil
			// anymore.
			n = (*traceMapNode)(m.Load())
		}
		if n.hash == hash && uintptr(len(n.data)) == size {
			if memequal(unsafe.Pointer(&n.data[0]), data, size) {
				return n.id, false
			}
		}
		m = &n.children[hashIter>>(8*goarch.PtrSize-2)]
		hashIter <<= 2
	}
}

(NilCheck ptr:(Convert (Addr {_} (SB)) _) _) => ptr

// for late-expanded calls, recognize memequal applied to a single constant byte
// Support is limited by 1, 2, 4, 8 byte sizes
(StaticLECall {callAux} sptr (Addr {scon} (SB)) (Const64 [1]) mem)
  && isSameCall(callAux, "runtime.memequal")
  && symIsRO(scon)
  => (MakeResult (Eq8 (Load <typ.Int8> sptr mem) (Const8 <typ.Int8> [int8(read8(scon,0))])) mem)

	// cond: isSameCall(callAux, "runtime.memequal") && isSamePtr(p, q)
	// result: (MakeResult (ConstBool <typ.Bool> [true]) mem)
	for {
		if len(v.Args) != 4 {
			break
		}
		callAux := auxToCall(v.Aux)
		mem := v.Args[3]
		p := v.Args[0]
		q := v.Args[1]
		if !(isSameCall(callAux, "runtime.memequal") && isSamePtr(p, q)) {
			break
		}
		v.reset(OpMakeResult)