v/vlib/math/bits/bits.arm64.v

// Copyright (c) 2019-2024 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module bits

@[inline]
pub fn mul_64(x u64, y u64) (u64, u64) {
	mut hi := u64(0)
	mut lo := u64(0)
	asm arm64 {
		mul lo, x, y
		umulh hi, x, y
		; =r (hi)
		  =r (lo)
		; r (x)
		  r (y)
		; cc
	}
	return hi, lo
}

@[inline]
pub fn mul_add_64(x u64, y u64, z u64) (u64, u64) {
	mut hi := u64(0)
	mut lo := u64(0)
	asm arm64 {
		mul lo, x, y
		umulh hi, x, y
		adds lo, lo, z
		adc hi, hi, xzr
		; =r (hi)
		  =r (lo)
		; r (x)
		  r (y)
		  r (z)
		; cc
	}
	return hi, lo
}