GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcompiler_rt/multi3.c Lines: 0 18 0.0 %
Date: 2017-11-13 Branches: 0 0 0.0 %

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/* ===-- multi3.c - Implement __multi3 -------------------------------------===
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 *
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 *                     The LLVM Compiler Infrastructure
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 *
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 * This file is dual licensed under the MIT and the University of Illinois Open
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 * Source Licenses. See LICENSE.TXT for details.
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 *
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 * ===----------------------------------------------------------------------===
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 * This file implements __multi3 for the compiler_rt library.
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 *
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 * ===----------------------------------------------------------------------===
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 */
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#include "int_lib.h"
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#ifdef CRT_HAS_128BIT
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/* Returns: a * b */
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static
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ti_int
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__mulddi3(du_int a, du_int b)
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{
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    twords r;
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    const int bits_in_dword_2 = (int)(sizeof(di_int) * CHAR_BIT) / 2;
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    const du_int lower_mask = (du_int)~0 >> bits_in_dword_2;
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    r.s.low = (a & lower_mask) * (b & lower_mask);
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    du_int t = r.s.low >> bits_in_dword_2;
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    r.s.low &= lower_mask;
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    t += (a >> bits_in_dword_2) * (b & lower_mask);
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    r.s.low += (t & lower_mask) << bits_in_dword_2;
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    r.s.high = t >> bits_in_dword_2;
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    t = r.s.low >> bits_in_dword_2;
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    r.s.low &= lower_mask;
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    t += (b >> bits_in_dword_2) * (a & lower_mask);
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    r.s.low += (t & lower_mask) << bits_in_dword_2;
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    r.s.high += t >> bits_in_dword_2;
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    r.s.high += (a >> bits_in_dword_2) * (b >> bits_in_dword_2);
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    return r.all;
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}
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/* Returns: a * b */
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COMPILER_RT_ABI ti_int
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__multi3(ti_int a, ti_int b)
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{
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    twords x;
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    x.all = a;
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    twords y;
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    y.all = b;
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    twords r;
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    r.all = __mulddi3(x.s.low, y.s.low);
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    r.s.high += x.s.high * y.s.low + x.s.low * y.s.high;
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    return r.all;
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}
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#endif /* CRT_HAS_128BIT */