2 * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright 2016 Cryptography Research, Inc.
5 * Licensed under the OpenSSL license (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
10 * Originally written by Mike Hamburg
13 #ifndef __ARCH_REF64_ARCH_INTRINSICS_H__
14 # define __ARCH_REF64_ARCH_INTRINSICS_H__
16 # define ARCH_WORD_BITS 64
18 static __inline__ __attribute((always_inline, unused))
19 uint64_t word_is_zero(uint64_t a)
21 /* let's hope the compiler isn't clever enough to optimize this. */
22 return (((__uint128_t) a) - 1) >> 64;
25 static __inline__ __attribute((always_inline, unused))
26 __uint128_t widemul(uint64_t a, uint64_t b)
28 return ((__uint128_t) a) * b;
31 #endif /* ARCH_REF64_ARCH_INTRINSICS_H__ */