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Diffstat (limited to 'test/Unit/clzdi2_test.c')
-rw-r--r-- | test/Unit/clzdi2_test.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/test/Unit/clzdi2_test.c b/test/Unit/clzdi2_test.c new file mode 100644 index 000000000000..24b85d8b7745 --- /dev/null +++ b/test/Unit/clzdi2_test.c @@ -0,0 +1,68 @@ +//===-- clzdi2_test.c - Test __clzdi2 -------------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. 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 + +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; +} |