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/* $OpenBSD: bn_arch.h,v 1.4 2023/02/16 10:41:03 jsing Exp $ */
/*
* Copyright (c) 2023 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef HEADER_BN_ARCH_H
#define HEADER_BN_ARCH_H
#ifndef OPENSSL_NO_ASM
#if 0 /* Needs testing and enabling. */
#if defined(__GNUC__)
#define HAVE_BN_MULW
static inline void
bn_mulw(BN_ULONG a, BN_ULONG b, BN_ULONG *out_r1, BN_ULONG *out_r0)
{
BN_ULONG r1, r0;
/*
* Unsigned multiplication using a mulh/mul pair. Note that the order
* of these instructions is important, as they can potentially be fused
* into a single operation.
*/
__asm__ ("mulh %0, %2, %3; mul %1, %2, %3"
: "=&r"(r1), "=r"(r0)
: "r"(a), "r"(b));
*out_r1 = r1;
*out_r0 = r0;
}
#endif /* __GNUC__ */
#endif
#endif
#endif
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