forked from OSchip/llvm-project
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
//===-- popcountsi2_test.c - Test __popcountsi2 ---------------------------===//
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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 tests __popcountsi2 for the compiler_rt library.
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//
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//===----------------------------------------------------------------------===//
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#include "int_lib.h"
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#include <stdio.h>
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#include <stdlib.h>
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// Returns: count of 1 bits
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COMPILER_RT_ABI si_int __popcountsi2(si_int a);
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int naive_popcount(si_int a)
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{
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int r = 0;
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for (; a; a = (su_int)a >> 1)
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r += a & 1;
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return r;
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}
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int test__popcountsi2(si_int a)
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{
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si_int x = __popcountsi2(a);
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si_int expected = naive_popcount(a);
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if (x != expected)
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printf("error in __popcountsi2(0x%X) = %d, expected %d\n",
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a, x, expected);
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return x != expected;
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}
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char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
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int main()
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{
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if (test__popcountsi2(0))
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return 1;
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if (test__popcountsi2(1))
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return 1;
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if (test__popcountsi2(2))
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return 1;
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if (test__popcountsi2(0xFFFFFFFD))
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return 1;
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if (test__popcountsi2(0xFFFFFFFE))
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return 1;
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if (test__popcountsi2(0xFFFFFFFF))
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return 1;
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int i;
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for (i = 0; i < 10000; ++i)
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if (test__popcountsi2(rand()))
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return 1;
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return 0;
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}
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