crypto/ec/curve448/arch_32/arch_intrinsics.h

   1 /*
   2  * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright 2016 Cryptography Research, Inc.
   4  *
   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
   9  *
  10  * Originally written by Mike Hamburg
  11  */
  12
  13 #ifndef __ARCH_ARCH_32_ARCH_INTRINSICS_H__
  14 # define __ARCH_ARCH_32_ARCH_INTRINSICS_H__
  15
  16 # define ARCH_WORD_BITS 32
  17
  18 static __inline__ __attribute((always_inline, unused))
  19 uint32_t word_is_zero(uint32_t a)
  20 {
  21     /* let's hope the compiler isn't clever enough to optimize this. */
  22     return (((uint64_t)a) - 1) >> 32;
  23 }
  24
  25 static __inline__ __attribute((always_inline, unused))
  26 uint64_t widemul(uint32_t a, uint32_t b)
  27 {
  28     return ((uint64_t)a) * b;
  29 }
  30
  31 #endif                          /* __ARCH_ARM_32_ARCH_INTRINSICS_H__ */