1 /* Copyright (c) 2016 Cryptography Research, Inc.
2 * Released under the MIT License. See LICENSE.txt for license information.
5 #ifndef __ARCH_REF64_ARCH_INTRINSICS_H__
6 #define __ARCH_REF64_ARCH_INTRINSICS_H__
8 #define ARCH_WORD_BITS 64
10 static __inline__ __attribute((always_inline,unused))
11 uint64_t word_is_zero(uint64_t a) {
12 /* let's hope the compiler isn't clever enough to optimize this. */
13 return (((__uint128_t)a)-1)>>64;
16 static __inline__ __attribute((always_inline,unused))
17 __uint128_t widemul(uint64_t a, uint64_t b) {
18 return ((__uint128_t)a) * b;
21 #endif /* ARCH_REF64_ARCH_INTRINSICS_H__ */