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79 lines
3.1 KiB
C
79 lines
3.1 KiB
C
// Copyright (c) 2014-2018, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote
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// developers
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#pragma once
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#include <assert.h>
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#include <stdint.h>
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static inline uint64_t hi_dword(uint64_t val) { return val >> 32; }
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static inline uint64_t lo_dword(uint64_t val) { return val & 0xFFFFFFFF; }
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static inline uint64_t mul128(uint64_t multiplier, uint64_t multiplicand,
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uint64_t* product_hi) {
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// multiplier = ab = a * 2^32 + b
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// multiplicand = cd = c * 2^32 + d
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// ab * cd = a * c * 2^64 + (a * d + b * c) * 2^32 + b * d
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uint64_t a = hi_dword(multiplier);
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uint64_t b = lo_dword(multiplier);
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uint64_t c = hi_dword(multiplicand);
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uint64_t d = lo_dword(multiplicand);
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uint64_t ac = a * c;
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uint64_t ad = a * d;
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uint64_t bc = b * c;
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uint64_t bd = b * d;
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uint64_t adbc = ad + bc;
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uint64_t adbc_carry = adbc < ad ? 1 : 0;
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// multiplier * multiplicand = product_hi * 2^64 + product_lo
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uint64_t product_lo = bd + (adbc << 32);
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uint64_t product_lo_carry = product_lo < bd ? 1 : 0;
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*product_hi = ac + (adbc >> 32) + (adbc_carry << 32) + product_lo_carry;
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assert(ac <= *product_hi);
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return product_lo;
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}
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#define SWAP64(x) \
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((((uint64_t)(x)&0x00000000000000ff) << 56) | \
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(((uint64_t)(x)&0x000000000000ff00) << 40) | \
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(((uint64_t)(x)&0x0000000000ff0000) << 24) | \
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(((uint64_t)(x)&0x00000000ff000000) << 8) | \
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(((uint64_t)(x)&0x000000ff00000000) >> 8) | \
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(((uint64_t)(x)&0x0000ff0000000000) >> 24) | \
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(((uint64_t)(x)&0x00ff000000000000) >> 40) | \
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(((uint64_t)(x)&0xff00000000000000) >> 56))
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