forked from OSchip/llvm-project
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
//===-- popcountdi2_test.c - Test __popcountdi2 ----------------------------===//
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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 __popcountdi2 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 __popcountdi2(di_int a);
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int naive_popcount(di_int a)
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{
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int r = 0;
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for (; a; a = (du_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__popcountdi2(di_int a)
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{
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si_int x = __popcountdi2(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 __popcountdi2(0x%llX) = %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_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
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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__popcountdi2(0))
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return 1;
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if (test__popcountdi2(1))
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return 1;
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if (test__popcountdi2(2))
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return 1;
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if (test__popcountdi2(0xFFFFFFFFFFFFFFFDLL))
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return 1;
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if (test__popcountdi2(0xFFFFFFFFFFFFFFFELL))
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return 1;
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if (test__popcountdi2(0xFFFFFFFFFFFFFFFFLL))
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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__popcountdi2(((di_int)rand() << 32) | rand()))
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return 1;
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return 0;
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}
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