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// RUN: %clang_builtins %s %librt -o %t && %run %t
//===-- clzdi2_test.c - Test __clzdi2 -------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file tests __clzdi2 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//
#include "int_lib.h"
#include <stdio.h>
// Returns: the number of leading 0-bits
// Precondition: a != 0
COMPILER_RT_ABI si_int __clzdi2(di_int a);
int test__clzdi2(di_int a, si_int expected)
{
si_int x = __clzdi2(a);
if (x != expected)
printf("error in __clzdi2(0x%llX) = %d, expected %d\n", a, x, expected);
return x != expected;
}
char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
int main()
{
const int N = (int)(sizeof(di_int) * CHAR_BIT);
// if (test__clzdi2(0x00000000, N)) // undefined
// return 1;
if (test__clzdi2(0x00000001, N-1))
return 1;
if (test__clzdi2(0x00000002, N-2))
return 1;
if (test__clzdi2(0x00000003, N-2))
return 1;
if (test__clzdi2(0x00000004, N-3))
return 1;
if (test__clzdi2(0x00000005, N-3))
return 1;
if (test__clzdi2(0x0000000A, N-4))
return 1;
if (test__clzdi2(0x1000000A, N/2+3))
return 1;
if (test__clzdi2(0x2000000A, N/2+2))
return 1;
if (test__clzdi2(0x6000000A, N/2+1))
return 1;
if (test__clzdi2(0x8000000AuLL, N/2))
return 1;
if (test__clzdi2(0x000005008000000AuLL, 21))
return 1;
if (test__clzdi2(0x020005008000000AuLL, 6))
return 1;
if (test__clzdi2(0x720005008000000AuLL, 1))
return 1;
if (test__clzdi2(0x820005008000000AuLL, 0))
return 1;
return 0;
}
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