69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
//===-- clzdi2_test.c - Test __clzdi2 -------------------------------------===//
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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 __clzdi2 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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// Returns: the number of leading 0-bits
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// Precondition: a != 0
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si_int __clzdi2(di_int a);
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int test__clzdi2(di_int a, si_int expected)
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{
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si_int x = __clzdi2(a);
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if (x != expected)
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printf("error in __clzdi2(0x%llX) = %d, expected %d\n", 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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int main()
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{
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const int N = (int)(sizeof(di_int) * CHAR_BIT);
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// if (test__clzdi2(0x00000000, N)) // undefined
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// return 1;
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if (test__clzdi2(0x00000001, N-1))
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return 1;
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if (test__clzdi2(0x00000002, N-2))
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return 1;
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if (test__clzdi2(0x00000003, N-2))
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return 1;
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if (test__clzdi2(0x00000004, N-3))
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return 1;
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if (test__clzdi2(0x00000005, N-3))
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return 1;
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if (test__clzdi2(0x0000000A, N-4))
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return 1;
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if (test__clzdi2(0x1000000A, N/2+3))
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return 1;
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if (test__clzdi2(0x2000000A, N/2+2))
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return 1;
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if (test__clzdi2(0x6000000A, N/2+1))
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return 1;
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if (test__clzdi2(0x8000000AuLL, N/2))
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return 1;
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if (test__clzdi2(0x000005008000000AuLL, 21))
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return 1;
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if (test__clzdi2(0x020005008000000AuLL, 6))
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return 1;
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if (test__clzdi2(0x720005008000000AuLL, 1))
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return 1;
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if (test__clzdi2(0x820005008000000AuLL, 0))
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return 1;
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return 0;
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}
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