GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcompiler_rt/popcountti2.c Lines: 0 9 0.0 %
Date: 2017-11-13 Branches: 0 0 0.0 %

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/* ===-- popcountti2.c - Implement __popcountti2 ----------------------------===
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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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 *
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 * This file implements __popcountti2 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: count of 1 bits */
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COMPILER_RT_ABI si_int
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__popcountti2(ti_int a)
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{
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    tu_int x3 = (tu_int)a;
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    x3 = x3 - ((x3 >> 1) & (((tu_int)0x5555555555555555uLL << 64) |
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                                     0x5555555555555555uLL));
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    /* Every 2 bits holds the sum of every pair of bits (64) */
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    x3 = ((x3 >> 2) & (((tu_int)0x3333333333333333uLL << 64) | 0x3333333333333333uLL))
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       + (x3 & (((tu_int)0x3333333333333333uLL << 64) | 0x3333333333333333uLL));
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    /* Every 4 bits holds the sum of every 4-set of bits (3 significant bits) (32) */
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    x3 = (x3 + (x3 >> 4))
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       & (((tu_int)0x0F0F0F0F0F0F0F0FuLL << 64) | 0x0F0F0F0F0F0F0F0FuLL);
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    /* Every 8 bits holds the sum of every 8-set of bits (4 significant bits) (16) */
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    du_int x2 = (du_int)(x3 + (x3 >> 64));
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    /* Every 8 bits holds the sum of every 8-set of bits (5 significant bits) (8) */
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    su_int x = (su_int)(x2 + (x2 >> 32));
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    /* Every 8 bits holds the sum of every 8-set of bits (6 significant bits) (4) */
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    x = x + (x >> 16);
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    /* Every 8 bits holds the sum of every 8-set of bits (7 significant bits) (2) */
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    /* Upper 16 bits are garbage */
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    return (x + (x >> 8)) & 0xFF;  /* (8 significant bits) */
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}
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#endif /* CRT_HAS_128BIT */